Bret Pasch

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• Beauregard, N., Theimer, T., Sferra, S., & Pasch, B. (2024). Using autonomous recording units to identify and monitor western yellow-billed cuckoo habitat. Wildlife Society Bulletin, 48(3). doi:10.1002/wsb.1546
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  Autonomous recording units (ARUs) paired with signal classification software can be used to detect species-specific calls, making them useful for evaluating patterns in avian occurrence and activity. However, classification of target signals is not always reliable and may be especially challenging for species that vocalize infrequently. We assessed the use of ARUs to identify and monitor habitat for a cryptic and federally threatened distinct population segment, the western yellow-billed cuckoo (Coccyzus americanus) in mountainous xeroriparian drainages. Using Kaleidoscope Pro, we developed a call-classifier and processed acoustic data collected in sites also surveyed using traditional human-observer methods, applying the same spatial and temporal detection criteria to estimate breeding territories for each method. The classifier detected a total of 4,061 true positive calls at 4 sites, had an overall precision score of 0.07, recall score of 0.09, and F-score (beta = 1) of 0.08, indicating high false positive and false negative classification rates. Our results were, however, consistent with other ARU studies of rare and cryptic species and ARUs estimated occupancy as effectively as human surveys with as little as 2 hours of daily recording. Total detections varied among sites, likely due to differences in cuckoo population densities and the interaction between topography and ARU detection space. Our results suggest that despite performance shortcomings of call-classifiers, ARUs can be effective for monitoring cuckoos, with potential for providing higher resolution temporal and spatial information on activity and habitat use and may be particularly effective in remote locations where cuckoos often occur.
• Brzozowski, R., Mahoney, S., Combrink, H., Hefty, K., & Pasch, B. (2024). Impact of forest management on the communication distance of an endangered tree squirrel. Journal of Wildlife Management. doi:10.1002/jwmg.22689
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  Long-distance acoustic signals mediate important social interactions between animals, and the structure of the environment can influence sound transmission to affect communication distance. Anthropogenic disturbances such as fire suppression alter forest structure and can potentially affect acoustic interactions by altering sound attenuation patterns. In the spruce-fir and mixed-conifer forests of the Pinaleño Mountains, Arizona, USA, that harbor endangered Mount Graham red squirrels (Tamiasciurus fremonti grahamensis), numerous historical anthropogenic disturbances have altered forest characteristics and contributed to habitat degradation and loss. In this study, we assessed how recent forest management treatments influenced the attenuation of red squirrel territorial rattle vocalizations. In June 2023–August 2023, we broadcast and recorded rattles 5.4 m above the forest floor at various distances (1, 10, 20, and 40 m) to mimic hypothetical senders and receivers. We used on-the-ground measurements and lidar to quantify forest structure relative to patterns of sound attenuation in 3 treatments: thinning, understory fuel reduction, and untreated control plots. Across all treatments, we found that increasing tree basal area resulted in higher attenuation, with rattles being approximately 6 dB lower in amplitude in the most dense compared to the least dense plots, equivalent to a doubling in squirrel communication distance. Additionally, rattles on untreated control plots experienced more attenuation than thinned (~3 dB) and fuel-reduced (~1.5 dB) plots. A lidar-derived measure of canopy structure was a better predictor of rattle attenuation than lower resolution on-the-ground measurements. In the short-term, forest thinning may facilitate development of acoustic social neighborhoods that increase squirrel fitness, though alternative costs of more open forests exist. More generally, our results indicate that forest management can affect the efficacy of acoustic communication and that integration of signaling and sensory ecology with remote sensing can inform wildlife conservation.
• Griffiths, G., & Pasch, B. (2024). Variation in responses to conspecific and heterospecific advertisement vocalizations in sympatric grasshopper mice (Onychomys). Journal of the Acoustical Society of America, 156(1). doi:10.1121/10.0026540
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  Advertisement vocalizations that function in mate acquisition and resource defense within species may also mediate behavioral interactions among species. While olfactory signals play an important role in mate choice and territoriality in rodents, less is known about the function of acoustic signals in influencing interspecific interactions. In this study, we used playback experiments in the laboratory to assess the function of long-distance vocalizations within and among three sympatric species of grasshopper mice. We found that, within each species, individuals of both sexes varied widely in spontaneous vocal behavior and response to playback. The largest species (Onychomys leucogaster) was most responsive to conspecifics, but smaller O. arenicola and O. torridus exhibited no clear pattern in their vocal behavior and were even responsive to the white noise controls. Our results indicate that grasshopper mice are broadly responsive to a range of sounds that resemble calls and that long-distance vocalizations function primarily as signals that facilitate localization for subsequent close-distance assessment by both sexes in various social contexts. Variation in vocal responses among species may depend on competitive dominance, degree of interaction, acoustic similarity, or behavioral changes resulting from captivity. Replicating playback experiments in the field will help validate whether the observed variation in the laboratory reflects ecologically relevant patterns in nature.
• Mahoney, S., & Pasch, B. (2024). Evolutionary lability of food caching behaviour in mammals. Journal of Animal Ecology. doi:10.1111/1365-2656.14093
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  Food hoarding provides animals access to resources during periods of scarcity. Studies on mammalian caching indicate associations with brain size, seasonality and diet but are biased to a subset of rodents. Whether the behaviour is generalizable at other taxonomic scales and/or is influenced by other ecological factors is less understood. Population density may influence food caching due to food competition or pilferage, but this remains untested in a comparative framework. Using phylogenetic analyses, we assessed the role of morphology (body and brain size), climate, diet breadth and population density on food caching behaviour evolution at multiple taxonomic scales. We also used a long-term dataset on caching behaviour of red squirrels (Tamiasciurus fremonti) to test key factors (climate and population density) on hoarding intensity. Consistent with previous smaller scale studies, we found the mammalian ancestral state for food caching was larderhoarding, and scatterhoarding was derived. Caching strategy was strongly associated with brain size, population density and climate. Mammals with larger brains and hippocampal volumes were more likely to scatterhoard, and species living at higher population densities and in colder climates were more likely to larderhoard. Finer-scale analyses within families, sub-families and tribes indicated that the behaviour is evolutionary labile. Brain size in family Sciuridae and tribe Marmotini was larger in scatterhoarders, but not in other tribes. Scatterhoarding in tribe Marmotini was more likely in species with lower population densities while scatterhoarding in tribe Sciurini was associated with warmer climates. Red squirrel larderhoarding intensity was positively related to population density but not climate, implicating food competition or pilferage as an important mechanism mediating caching behaviour. Our results are consistent with previous smaller-scale studies on food caching and indicate the evolutionary patterns of mammalian food caching are broadly generalizable. Given the lability of caching behaviour as evidenced by the variability of our results at finer phylogenetic scales, comparative analyses must consider taxonomic scale. Applying our results to conservation could prove useful as changes in population density or climate may select for different food caching strategies and thus can inform management of threatened and endangered species and their habitats.
• Brzozowski, R., Kobrina, A., Mahoney, S. M., & Pasch, B. (2023). Advertising and receiving from heights increases transmission of vocalizations in semi-arboreal mice. Behavioral Ecology and Sociobiology. doi:10.1007/s00265-023-03352-4
• Brzozowski, R., Kobrina, A., Mahoney, S., & Pasch, B. (2023). Advertising and receiving from heights increases transmission of vocalizations in semi-arboreal mice. Behavioral Ecology & Sociobiology, 77(7). doi:10.1007/s00265-023-03352-4
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  Abstract: Many animals produce long-distance acoustic signals to mediate a variety of social interactions, and the efficacy of transmission depends in part on environmental attenuation. Vocalizing from positions that optimize transmission is one key solution to minimizing attenuation, though few studies assess the magnitude of this effect in relation to receiver position. In this study, we assessed how transmission of high-frequency vocalizations produced by pinyon mice (Peromyscus truei) varied based on the position of senders and receivers. Pinyon mice are semi-arboreal rodents that produce sustained vocalizations to advertise to conspecifics. Synthesized signals derived from a population-sample-average of fundamental frequency, duration, and amplitude were broadcast and recorded at different heights (0, 1, and 2 m) and distances (1, 2, 4, and 8 m) in a full factorial design to mimic hypothetical senders and receivers. We also measured receiver hearing sensitivity using auditory brainstem responses (ABR) to quantify the audible distance (active space) of vocalizations at different heights. Vocalizations showed less attenuation when emitted and received from an elevation compared to the ground if the signal was received at least 4 m from the sender. Vocalizations emitted from a 1 m height had an approximately 3 times greater audible distance compared to the ground. Additionally, less attenuation occurred when both senders and receivers were elevated at the same height and when receivers were elevated, regardless of sender height. Our results highlight the importance of considering receiver position in animal communication, especially when senders produce highly directional signals. Significance statement: Vocalizing animals often position themselves in locations that maximize sound transmission. However, the magnitude of this effect is not often quantified, especially in relation to the position of intended receivers. In this study, we combined acoustic recording, hearing experiments, and modelling of sound attenuation to quantify how sending and receiving vocalizations from trees impacts sound transmission in a semi-arboreal mouse. We found that vocalizations produced from 1 m above the ground could be heard by receivers at 3 times the distance compared to ground level. We also found that no matter the sender position, receivers benefitted from being at elevated positions. Finally, we found that the least attenuation occurred when senders and receivers were elevated at the same height. Our results highlight the importance of considering receiver position in animal communication, especially when senders produce highly directional signals.
• Kobrina, A., Letowt, M. E., & Pasch, B. (2023). Vocal repertoire and auditory sensitivity of white-throated woodrats (Neotoma albigula).. Journal of Comparative Psychology. doi:10.1037/com0000330
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  Rodents produce a variety of acoustic signals to communicate different types of information such as identity, reproductive state, or danger. The degree to which hearing sensitivity matches particular frequencies of conspecific vocalizations may provide insight into the relative importance of different acoustic signals. In this experiment, we characterized vocal and footdrumming behaviors of white-throated woodrats (Neotoma albigula) and measured their hearing sensitivity using the auditory brainstem response. Adult and juvenile woodrats produced seven categories of vocalizations, with six categories containing frequencies that overlap their peak hearing sensitivity. In addition, woodrats produced low-frequency footdrumming signals in the presence of same- and opposite-sex social partners and in social isolation. Woodrats varied spectral and temporal characteristics of vocalizations based on social composition of the dyad. Woodrat audition spanned 1 to 42 kHz, with a broad range of best hearing sensitivity between 4 and 20 kHz. Compared to other rodents that primarily produce high-frequency vocalizations in social contexts, woodrat audition was more sensitive to low frequencies that typify their vocal repertoire. Our results suggest that the auditory system of white-throated woodrats is broadly tuned to detect behaviorally relevant acoustic signals. (PsycInfo Database Record (c) 2023 APA, all rights reserved).
• Quinn, C. A., Burns, P. J., Hakkenberg, C. R., Salas, L., Pasch, B., Goetz, S. J., & Clark, M. L. (2023). Soundscape components inform acoustic index patterns and refine estimates of bird species richness. Front. Remote Sens. doi:10.3389/frsen.2023.1156837
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  Ecoacoustic monitoring has proliferated as autonomous recording units (ARU) have become more accessible. ARUs provide a non-invasive, passive method to assess ecosystem dynamics related to vocalizing animal behavior and human activity. With the ever-increasing volume of acoustic data, the field has grappled with summarizing ecologically meaningful patterns in recordings. Almost 70 acoustic indices have been developed that offer summarized measurements of bioacoustic activity and ecosystem conditions. However, their systematic relationships to ecologically meaningful patterns in varying sonic conditions are inconsistent and lead to non-trivial interpretations. We used an acoustic dataset of over 725,000 min of recordings across 1,195 sites in Sonoma County, California, to evaluate the relationship between 15 established acoustic indices and sonic conditions summarized using five soundscape components classified using a convolutional neural network: anthropophony (anthropogenic sounds), biophony (biotic sounds), geophony (wind and rain), quiet (lack of emergent sound), and interference (ARU feedback). We used generalized additive models to assess acoustic indices and biophony as ecoacoustic indicators of avian diversity. Models that included soundscape components explained acoustic indices with varying degrees of performance (avg. adj-R 2 = 0.61 ± 0.16; n = 1,195). For example, we found the normalized difference soundscape index was the most sensitive index to biophony while being less influenced by ambient sound. However, all indices were affected by non-biotic sound sources to varying degrees. We found that biophony and acoustic indices combined were highly predictive in modeling bird species richness (deviance = 65.8%; RMSE = 3.9 species; n = 1,185 sites) for targeted, morning-only recording periods. Our analyses demonstrate the confounding effects of non-biotic soundscape components on acoustic indices, and we recommend that applications be based on anticipated sonic environments. For instance, in the presence of extensive rain and wind, we suggest using an index minimally affected by geophony. Furthermore, we provide evidence that a measure of biodiversity (bird species richness) is related to the aggregate biotic acoustic activity (biophony). This established relationship adds to recent work that identifies biophony as a reliable and generalizable ecoacoustic measure of biodiversity.
• Quinn, C., Burns, P., Hakkenberg, C., Salas, L., Pasch, B., Goetz, S., & Clark, M. (2023). Soundscape components inform acoustic index patterns and refine estimates of bird species richness. Frontiers in Remote Sensing, 4. doi:10.3389/frsen.2023.1156837
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  Ecoacoustic monitoring has proliferated as autonomous recording units (ARU) have become more accessible. ARUs provide a non-invasive, passive method to assess ecosystem dynamics related to vocalizing animal behavior and human activity. With the ever-increasing volume of acoustic data, the field has grappled with summarizing ecologically meaningful patterns in recordings. Almost 70 acoustic indices have been developed that offer summarized measurements of bioacoustic activity and ecosystem conditions. However, their systematic relationships to ecologically meaningful patterns in varying sonic conditions are inconsistent and lead to non-trivial interpretations. We used an acoustic dataset of over 725,000 min of recordings across 1,195 sites in Sonoma County, California, to evaluate the relationship between 15 established acoustic indices and sonic conditions summarized using five soundscape components classified using a convolutional neural network: anthropophony (anthropogenic sounds), biophony (biotic sounds), geophony (wind and rain), quiet (lack of emergent sound), and interference (ARU feedback). We used generalized additive models to assess acoustic indices and biophony as ecoacoustic indicators of avian diversity. Models that included soundscape components explained acoustic indices with varying degrees of performance (avg. adj-R2 = 0.61 ± 0.16; n = 1,195). For example, we found the normalized difference soundscape index was the most sensitive index to biophony while being less influenced by ambient sound. However, all indices were affected by non-biotic sound sources to varying degrees. We found that biophony and acoustic indices combined were highly predictive in modeling bird species richness (deviance = 65.8%; RMSE = 3.9 species; n = 1,185 sites) for targeted, morning-only recording periods. Our analyses demonstrate the confounding effects of non-biotic soundscape components on acoustic indices, and we recommend that applications be based on anticipated sonic environments. For instance, in the presence of extensive rain and wind, we suggest using an index minimally affected by geophony. Furthermore, we provide evidence that a measure of biodiversity (bird species richness) is related to the aggregate biotic acoustic activity (biophony). This established relationship adds to recent work that identifies biophony as a reliable and generalizable ecoacoustic measure of biodiversity.
• Riede, T., Kobrina, A., & Pasch, B. (2023).

  Anatomy and mechanisms of vocal production in harvest mice.

  . Journal of Experimental Biology. doi:10.1242/jeb.246553
• Fernández-Vargas, M., Riede, T., & Pasch, B. (2022). Mechanisms and constraints underlying acoustic variation in rodents. Animal Behaviour. doi:10.1016/j.anbehav.2021.07.011
• Kobrina, A., Letowt, M., & Pasch, B. (2022). Vocal Repertoire and Auditory Sensitivity of White-Throated Woodrats (Neotoma albigula). J Comp Psychol .. doi:10.1037/com0000330
  More info

  Rodents produce a variety of acoustic signals to communicate different types of information such as identity, reproductive state, or danger. The degree to which hearing sensitivity matches particular frequencies of conspecific vocalizations may provide insight into the relative importance of different acoustic signals. In this experiment, we characterized vocal and footdrumming behaviors of white-throated woodrats (Neotoma albigula) and measured their hearing sensitivity using the auditory brainstem response. Adult and juvenile woodrats produced seven categories of vocalizations, with six categories containing frequencies that overlap their peak hearing sensitivity. In addition, woodrats produced low-frequency footdrumming signals in the presence of same and opposite-sex social partners and in social isolation. Woodrats varied spectral and temporal characteristics of vocalizations based on social composition of the dyad. Woodrat audition spanned 1 to 42 kHz, with a broad range of best hearing sensitivity between 4 and 20 kHz. Compared to other rodents that primarily produce high-frequency vocalizations in social contexts, woodrat audition was more sensitive to low frequencies that typify their vocal repertoire. Our results suggest that the auditory system of white-throated woodrats is broadly tuned to detect behaviorally relevant acoustic signals.
• Pasch, B. S. (2021). Mechanisms of sound production in deer mice (Peromyscus). Journal of Experimental Biology.
• Pasch, B. S. (2021). Postnatal remodeling of the laryngeal airway removes body size-dependency of spectral features for ultrasonic whistling in laboratory mice.. Journal of Zoology.
• Pasch, B., Darwaiz, T., & Riede, T. (2022). Postnatal remodeling of the laryngeal airway removes body size dependency of spectral features for ultrasonic whistling in laboratory mice. Journal of Zoology, 318(2), 114-126. doi:10.1111/jzo.13003
• Pasch, B., Riede, T., Kobrina, A., Bone, L., & Darwaiz, T. (2022). Mechanisms of sound production in deer mice (Peromyscus spp.). Journal of Experimental Biology, 225(9). doi:10.1242/jeb.243695
• Fern\'andez-Vargas, M., Riede, T., & Pasch, B. (2021). Mechanisms and constraints underlying acoustic variation in rodents. Animal Behaviour.
• Kobrina, A., Hidau, M. K., Riede, T., O'neil, W. G., & Pasch, B. (2021). Age-related and noise-induced hearing loss alters grasshopper mouse (Onychomys) vocalizations. Hearing Research, 404, 108210.
• Kobrina, A., Letowt, M. E., & Pasch, B. (2021). The influence of social context on pinyon mouse (Peromyscus truei) vocalizations. Journal of Mammalogy.
• Mahoney, S. M., Pasch, B., & Theimer, T. C. (2021). Subspecies discrimination based on song structure by Willow Flycatchers. Journal of Field Ornithology, 92(2), 173--183.
• Maurer, M., Peralta, M. K., Trevelline, B. K., Tripoli, D., Dearing, M. D., Derting, T., Martinez, M. R., Pasch, B., & Kohl, K. D. (2021). Diet alters rodent fecal pellet size: implications for paleoecological and demographic studies using fecal dimensions. Journal of Mammalogy, 102(6), 1619--1626.
• Pasch, B., Kobrina, A., & Letowt, M. E. (2021). The influence of social context on pinyon mouse (Peromyscus truei) vocalizations. Journal of Mammalogy, 103(2), 275-286. doi:10.1093/jmammal/gyab127
• Pasch, B., Kobrina, A., Hidau, M., Riede, T., & Guthrie, O. (2021). Grasshopper mice alter vocalizations with age-related and noise-induced hearing loss. The Journal of the Acoustical Society of America, 149(4), A78-A78. doi:10.1121/10.0004572
• Pasch, B., Mahoney, S. M., & Theimer, T. C. (2021). Subspecies discrimination based on song structure by Willow Flycatchers. Journal of Field Ornithology, 92(2), 173-183. doi:10.1111/jofo.12366
• Pasch, B., Maurer, M., Peralta Martínez, K., Trevelline, B. K., Tripoli, D., Dearing, M. D., Derting, T., Martinez Mota, R., & Kohl, K. D. (2021). Diet alters rodent fecal pellet size: implications for paleoecological and demographic studies using fecal dimensions. Journal of Mammalogy, 102(6), 1619-1626. doi:10.1093/jmammal/gyab098
• Borgard, H. L., Baab, K., Pasch, B., & Riede, T. (2020). The shape of sound: a geometric morphometrics approach to laryngeal functional morphology. Journal of Mammalian Evolution, 27(3), 577--590.
• Green, D. M., Mull, N., Scolman, T., Griffiths, G., & Pasch, B. (2020). Active space of grasshopper mouse vocalizations (Onychomys) in relation to woody plant encroachment. Behaviour, 157(14-15), 1211--1229.
• Mahoney, S. M., Reudink, M. W., Pasch, B., & Theimer, T. C. (2020). Author response for "Song but not plumage varies geographically among Willow Flycatcher ( Empidonax traillii ) subspecies". Journal of Avian Biology. doi:10.1111/jav.02621/v2/response1
• Mahoney, S. M., Reudink, M. W., Pasch, B., & Theimer, T. C. (2020). Song but not plumage varies geographically among willow flycatcher Empidonax traillii subspecies. Journal of Avian Biology, 51(12).
• Pasch, B. S. (2020). Crotalus viridis (Prairie Rattlesnake). Herpetological Review.
• Pasch, B., & Riede, T. (2020). Pygmy mouse songs reveal anatomical innovations underlying acoustic signal elaboration in rodents. Journal of Experimental Biology. doi:10.1242/jeb.223925
• Pasch, B., Green, D. M., Mull, N., Scolman, T., & Griffiths, G. (2020). Active space of grasshopper mouse vocalizations (Onychomys) in relation to woody plant encroachment. Behaviour, 157(14-15), 1211-1229. doi:10.1163/1568539x-bja10046
• Pasch, B., Mahoney, S. M., Reudink, M. W., & Theimer, T. C. (2020). Song but not plumage varies geographically among willow flycatcher Empidonax traillii subspecies. Journal of Avian Biology, 51(12). doi:10.1111/jav.02621
• Riede, T., & Pasch, B. (2020). Pygmy mouse songs reveal anatomical innovations underlying acoustic signal elaboration in rodents. Journal of Experimental Biology, 223(12), jeb223925.
• Roden, E., Carlin, B., Nowak, E. M., Pasch, B., & others, . (2020). Crotalus viridis. Diet.. Herpetological review, 51.
• Borgard, H., Baab, K. L., Pasch, B., & Riede, T. (2019). The Shape of Sound: a Geometric Morphometrics Approach to Laryngeal Functional Morphology. Journal of Mammalian Evolution. doi:10.1007/s10914-019-09466-9
• Campbell, P., Ar\'evalo, L., Martin, H., Chen, C., Sun, S., Rowe, A. H., Webster, M. S., Searle, J. B., & Pasch, B. (2019). Vocal divergence is concordant with genomic evidence for strong reproductive isolation in grasshopper mice (Onychomys). Ecology and evolution, 9(22), 12886--12896.
• Green, D. M., Scolman, T., Pasch, B., & others, . (2019). A broad filter between call frequency and peripheral auditory sensitivity in northern grasshopper mice (Onychomys leucogaster). Journal of Comparative Physiology A, 205(4), 481--489.
• Pasch, B., Campbell, P., Arévalo, L., Martin, H., Chen, C., Sun, S., Rowe, A. H., Webster, M. S., & Searle, J. B. (2019). Vocal divergence is concordant with genomic evidence for strong reproductive isolation in grasshopper mice ( Onychomys ). Ecology and Evolution, 9(22), 12886-12896. doi:10.1002/ece3.5770
• Sun, S., Miao, Z., Ratcliffe, B., Campbell, P., Pasch, B., El-Kassaby, Y. A., Balasundaram, B., & Chen, C. (2019). SNP variable selection by generalized graph domination. PLoS One, 14(1), e0203242.
• Sun, S., Miao, Z., Ratcliffe, B., Campbell, P., Pasch, B., El‐Kassaby, Y. A., Balasundaram, B., & Chen, C. (2018). SNP Variable Selection by Generalized Graph Domination. PLoS One. doi:10.1101/396085
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  Abstract High-throughput sequencing technology has revolutionized both medical and biological research by generating exceedingly large numbers of genetic variants. The resulting datasets share a number of common characteristics that might lead to poor generalization capacity. Concerns include noise accumulated due to the large number of predictors, sparse information regarding the p ≫ n problem, and overfitting and model mis-identification resulting from spurious collinearity. Additionally, complex correlation patterns are present among variables. As a consequence, reliable variable selection techniques play a pivotal role in predictive analysis, generalization capability, and robustness in clustering, as well as interpretability of the derived models. K -dominating set, a parameterized graph-theoretic generalization model, was used to model SNP (single nucleotide polymorphism) data as a similarity network and searched for representative SNP variables. In particular, each SNP was represented as a vertex in the graph, (dis)similarity measures such as correlation coefficients or pairwise linkage disequilibrium were estimated to describe the relationship between each pair of SNPs; a pair of vertices are adjacent, i.e. joined by an edge, if the pairwise similarity measure exceeds a user-specified threshold. A minimum K -dominating set in the SNP graph was then made as the smallest subset such that every SNP that is excluded from the subset has at least k neighbors in the selected ones. The strength of k -dominating set selection in identifying independent variables, and in culling representative variables that are highly correlated with others, was demonstrated by a simulated dataset. The advantages of k -dominating set variable selection were also illustrated in two applications: pedigree reconstruction using SNP profiles of 1,372 Douglas-fir trees, and species delineation for 226 grasshopper mouse samples. A C++ source code that implements SNP-SELECT and uses Gurobi™ optimization solver for the k -dominating set variable selection is available ( https://github.com/transgenomicsosu/SNP-SELECT ).
• Mason, N. A., Pasch, B., Burns, K. J., & Derryberry, E. P. (2017). Integrating museum and media collections to study vocal ecology and evolution. The Extended Specimen: Emerging Frontiers in Collections-Based Ornithological Research, 57.
• Moore, E. S., Cleland, T. A., Williams, W. O., Peterson, C. M., Singh, B., Southard, T. L., Pasch, B., Labitt, R. N., & Daugherity, E. K. (2017). Comparing phlebotomy by tail tip amputation, facial vein puncture, and tail vein incision in C57BL/6 mice by using physiologic and behavioral metrics of pain and distress. Journal of the American Association for Laboratory Animal Science, 56(3), 307--317.
• Moore, E. S., Cleland, T. A., Williams, W. O., Peterson, C., Singh, B., Southard, T., Pasch, B., Labitt, R. N., & Daugherity, E. K. (2017). Comparing Phlebotomy by Tail Tip Amputation, Facial Vein Puncture, and Tail Vein Incision in C57BL/6 Mice by Using Physiologic and Behavioral Metrics of Pain and Distress.. Journal of the American Association for Laboratory Animal Science.
• Pasch, B. S., & Pasch, B. S. (2017). Laryngeal airway construction indicates rodent ultrasonic vocalizations are produced by an edge-tone mechanism.. Royal Society Open Science.
• Pasch, B., Pasch, B., Tokuda, I. T., Tokuda, I. T., Riede, T., & Riede, T. (2017). Grasshopper mice employ distinct vocal production mechanisms in different social contexts. Proceedings of the Royal Society B: Biological Sciences, 284(1859), 20171158.
• Pasch, B., Riede, T., & Borgard, H. L. (2017). Laryngeal airway reconstruction indicates that rodent ultrasonic vocalizations are produced by an edge-tone mechanism. Royal Society Open Science, 4(11), 170976. doi:10.1098/rsos.170976
• Pasch, B., Sanford, R., & Phelps, S. M. (2017). Agonistic character displacement in social cognition of advertisement signals. Animal Cognition, 20(2), 267--273.
• Pasch, B., Tokuda, I. T., & Riede, T. (2017). Supplementary material from "Grasshopper mice employ distinct vocal production mechanisms in different social contexts". Proc Roy Soc B. doi:10.6084/m9.figshare.c.3820792.v1
• Riede, T., Borgard, H., & Pasch, B. (2017). Supplementary material from "Laryngeal airway reconstruction indicates that rodent ultrasonic vocalizations are produced by an edge-tone mechanism". Royal Soc Open Science. doi:10.6084/m9.figshare.c.3906088.v3
• Pasch, B., Abbasi, M. Z., Wilson, M., Zhao, D., Searle, J. B., Webster, M. S., & Rice, A. N. (2016). Cross-fostering alters advertisement vocalizations of grasshopper mice (Onychomys): evidence for the developmental stress hypothesis. Physiology \& Behavior, 157, 265--269.
• Pasch, B., Sanford, R., & Phelps, S. (2016). Agonistic character displacement in social cognition of advertisement signals. Animal Cognition. doi:10.1007/s10071-016-1046-6
• Shipley, J. R., Campbell, P., Searle, J. B., & Pasch, B. (2016). Asymmetric energetic costs in reciprocal-cross hybrids between carnivorous mice (Onychomys). Journal of Experimental Biology, 219(23), 3803--3809.
• Campbell, P., Pasch, B., Warren, A. L., & Phelps, S. (2014). Vocal Ontogeny in Neotropical Singing Mice (Scotinomys). PLoS One. doi:10.1371/journal.pone.0113628
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  Isolation calls produced by dependent young are a fundamental form of communication. For species in which vocal signals remain important to adult communication, the function and social context of vocal behavior changes dramatically with the onset of sexual maturity. The ontogenetic relationship between these distinct forms of acoustic communication is surprisingly under-studied. We conducted a detailed analysis of vocal development in sister species of Neotropical singing mice, Scotinomys teguina and S. xerampelinus. Adult singing mice are remarkable for their advertisement songs, rapidly articulated trills used in long-distance communication; the vocal behavior of pups was previously undescribed. We recorded 30 S. teguina and 15 S. xerampelinus pups daily, from birth to weaning; 23 S. teguina and 11 S. xerampelinus were recorded until sexual maturity. Like other rodent species with poikilothermic young, singing mice were highly vocal during the first weeks of life and stopped vocalizing before weaning. Production of first advertisement songs coincided with the onset of sexual maturity after a silent period of ≧2 weeks. Species differences in vocal behavior emerged early in ontogeny and notes that comprise adult song were produced from birth. However, the organization and relative abundance of distinct note types was very different between pups and adults. Notably, the structure, note repetition rate, and intra-individual repeatability of pup vocalizations did not become more adult-like with age; the highly stereotyped structure of adult song appeared de novo in the first songs of young adults. We conclude that, while the basic elements of adult song are available from birth, distinct selection pressures during maternal dependency, dispersal, and territorial establishment favor major shifts in the structure and prevalence of acoustic signals. This study provides insight into how an evolutionarily conserved form of acoustic signaling provides the raw material for adult vocalizations that are highly species specific.
• Campbell, P., Pasch, B., Warren, A. L., & Phelps, S. M. (2014). Vocal ontogeny in neotropical singing mice (Scotinomys). PloS one, 9(12), e113628.
• Monaghan, J. R., Stier, A. C., Michonneau, F., Smith, M. D., Pasch, B., Maden, M., & Seifert, A. W. (2014). Experimentally induced metamorphosis in axolotls reduces regenerative rate and fidelity. Regeneration, 1(1), 2--14.
• Pasch, B., & Pino, J. L. (2013). Cost of Advertising: Long-Tailed Weasels (Mustela frenata) as Potential Acoustically-Orienting Predators of Neotropical Singing Mice (Scotinomys). Southwestern Naturalist. doi:10.1894/0038-4909-58.3.363
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  We report on three interactions between long-tailed weasels (Mustela frenata) and Neotropical singing mice (Scotinomys). Our observations suggest that weasels are potential acoustically-orienting predators of singing mice. We speculate that differences in pressure from eavesdropping by weasels may contribute to differences in length and complexity of songs between sister species of Neotropical singing mice.Reportamos tres interacciones entre la comadreja de cola larga (Mustela frenata) y los ratones cantores neotropicales (Scotinomys). Nuestras observaciones sugieren que las comadrejas potencialmente escuchan las vocalizaciones y así favorecen la depredación de estos ratones. Especulamos que diferencias en la presión de escuchar subrepticiamente por comadrejas pueden contribuir a las diferencias en duración y complejidad de la vocalización entre especies hermanas de los ratones cantores neotropicales.
• Pasch, B., & Pino, J. L. (2013). Cost of advertising: Long-tailed weasels (Mustela frenata) as potential acoustically-orienting predators of Neotropical singing mice (Scotinomys). The Southwestern Naturalist, 58(3), 363--366.
• Pasch, B., Bolker, B. M., & Phelps, S. (2013). Interspecific Dominance Via Vocal Interactions Mediates Altitudinal Zonation in Neotropical Singing Mice. American Naturalist. doi:10.1086/673263
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  Interspecific aggression between ecologically similar species may influence geographic limits by mediating competitive exclusion at the range edge. Advertisement signals that mediate competitive interactions within species may also provide social information that contributes to behavioral dominance and spatial segregation among species. We studied the mechanisms underlying altitudinal range limits in Neotropical singing mice (Scotinomys), a genus of muroid rodent in which males vocalize to repel rivals and attract mates. We first delineated replacement zones and described temperature regimes on three mountains in Costa Rica and Panama where Chiriquí singing mice (S. xerampelinus) abruptly replace Alston’s singing mice (S. teguina). Next, we conducted interspecific behavioral trials and reciprocal removal experiments to examine if interspecific aggression mediated species replacement. Finally, we performed reciprocal playback experiments to investigate whether response to song matched competitive interactions. Behavioral trials and removal experiments suggest that S. xerampelinus is behaviorally dominant and excludes S. teguina from higher, cooler altitudes. Playback experiments indicate that subordinate S. teguina is silenced and repelled by heterospecific song, whereas S. xerampelinus responded to heterospecifics with approach and song rates comparable to responses to conspecifics. Thus, interspecific communication reflects underlying dominance and suggests that acoustic signaling contributes to altitudinal zonation of ecologically similar congeners. Our findings implicate the use of social information in structuring spatial distributions of animal communities across landscapes and provide insight into how large-scale patterns are generated by individual interactions.
• Pasch, B., Bolker, B. M., & Phelps, S. M. (2013). Interspecific dominance via vocal interactions mediates altitudinal zonation in neotropical singing mice. The American Naturalist, 182(5), E161--E173.
• Hayssen, V., Miranda, F., & Pasch, B. (2012). Cyclopes didactylus (Pilosa: Cyclopedidae). Mammalian Species, 44(895), 51--58.
• Seifert, A. W., Monaghan, J. R., Smith, M. D., Pasch, B., Stier, A. C., Michonneau, F., & Maden, M. (2012). The influence of fundamental traits on mechanisms controlling appendage regeneration. Biological Reviews, 87(2), 330--345.
• Pasch, B., & Koprowski, J. L. (2011). Impacts of fire suppression on space use by Mexican fox squirrels. Journal of Mammalogy, 92(1), 227--234.
• Pasch, B., George, A. S., Campbell, P., & Phelps, S. M. (2011). Androgen-dependent male vocal performance influences female preference in Neotropical singing mice. Animal Behaviour, 82(2), 177--183.
• Pasch, B., George, A. S., Hamlin, H. J., Guillette Jr, ,. L., & Phelps, S. M. (2011). Androgens modulate song effort and aggression in Neotropical singing mice. Hormones and Behavior, 59(1), 90--97.
• Seifert, A. W., Monaghan, J. R., Smith, M. D., Pasch, B., Stier, A. C., Michonneau, F., & Maden, M. (2011). The influence of fundamental traits on mechanisms controlling appendage regeneration. Biological Reviews. doi:10.1111/j.1469-185x.2011.00199.x
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  One of the most compelling questions in evolutionary biology is why some animals can regenerate injured structures while others cannot. Appendage regeneration appears to be common when viewed across the metazoan phylogeny, yet this ability has been lost in many taxa to varying degrees. Within species, the capacity for regeneration also can vary ontogenetically among individuals. Here we argue that appendage regeneration along the secondary body axis may be constrained by fundamental traits such as body size, aging, life stage, and growth pattern. Studies of the molecular mechanisms affecting regeneration have been conducted primarily with small organisms at early life stages. Such investigations disregard the dramatic shifts in morphology and physiology that organisms undergo as they age, grow, and mature. To help explain interspecific and intraspecific constraints on regeneration, we link particular fundamental traits to specific molecular mechanisms that control regeneration. We present a new synthesis for how these fundamental traits may affect the molecular mechanisms of regeneration at the tissue, cellular, and genomic levels of biological organization. Future studies that explore regeneration in organisms across a broad phylogenetic scale, and within an ontogenetic framework, will help elucidate the proximate mechanisms that modulate regeneration and may reveal new biomedical applications for use in regenerative medicine.
• Campbell, P., Pasch, B., Pino, J. L., Crino, O. L., Phillips, M., & Phelps, S. (2010). GEOGRAPHIC VARIATION IN THE SONGS OF NEOTROPICAL SINGING MICE: TESTING THE RELATIVE IMPORTANCE OF DRIFT AND LOCAL ADAPTATION. Evolution. doi:10.1111/j.1558-5646.2010.00962.x
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  Patterns of geographic variation in communication systems can provide insight into the processes that drive phenotypic evolution. Although work in birds, anurans, and insects demonstrates that acoustic signals are sensitive to diverse selective and stochastic forces, processes that shape variation in mammalian vocalizations are poorly understood. We quantified geographic variation in the advertisement songs of sister species of singing mice, montane rodents with a unique mode of vocal communication. We tested three hypotheses to explain spatial variation in the song of the lower altitude species, Scotinomys teguina: selection for species recognition in sympatry with congener, S. xerampelinus, acoustic adaptation to different environments, and stochastic divergence. Mice were sampled at seven sites in Costa Rica and Panamá; genetic distances were estimated from mitochondrial control region sequences, between-site differences in acoustic environment were estimated from climatic data. Acoustic, genetic and geographic distances were all highly correlated in S. teguina, suggesting that population differentiation in song is largely shaped by genetic drift. Contrasts between interspecific genetic-acoustic distances were significantly greater than expectations derived from intraspecific contrasts, indicating accelerated evolution of species-specific song. We propose that, although much intraspecific acoustic variation is effectively neutral, selection has been important in shaping species differences in song.
• Campbell, P., Pasch, B., Pino, J. L., Crino, O. L., Phillips, M., & Phelps, S. M. (2010). Geographic variation in the songs of neotropical singing mice: testing the relative importance of drift and local adaptation. Evolution: International Journal of Organic Evolution, 64(7), 1955--1972.
• Leonard, K. M., Pasch, B., & Koprowski, J. L. (2009). Sciurus pucheranii (Rodentia: Sciuridae). Mammalian Species, 1--4.
• Koprowski, J. L., Ramos, N., Pasch, B. S., & Zugmeyer, C. A. (2006). Observations on the ecology of the endemic Mearns's squirrel (Tamiasciurus mearnsi). The Southwestern Naturalist, 51(3), 426--430.
• Koprowski, J. L., Ramos, N., Pasch, B., & Zugmeyer, C. A. (2006). OBSERVATIONS ON THE ECOLOGY OF THE ENDEMIC MEARNS'S SQUIRREL (TAMIASCIURUS MEARNSI). Southwestern Naturalist. doi:10.1894/0038-4909(2006)51[426:ooteot]2.0.co;2
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  Mearns's squirrel (Tamiasciurus mearnsi) is an endemic species of the montane forest of the Sierra de San Pedro Mártir in Baja California. Despite having been described for the first time in 1893 and a listing as threatened by Mexican authorities, no information is available on the ecology of this southernmost Tamiasciurus. We observed the ecology of Mearns's squirrels during 2004 and 2005. Mearns's squirrel apparently does not form larderhoards, known as middens, or leaf nests commonly built by other members of this genus. We observed Mearns's squirrels to feed heavily on tree seeds and fungi. We noted males with scrotal testes and a female in estrus in late spring. We did not observe eastern gray squirrels (Sciurus carolinensis), introduced to the western Sierra in 1946, within the areas that we searched for T. mearnsi. Mearns's squirrels might possess unique adaptations for their persistence in the dry, open forest of the Sierra de San Pedro Mártir.
• Pasch, B. S., & Koprowski, J. L. (2006). Annual cycles in body mass and reproduction of Chiricahua fox squirrels (Sciurus nayaritensis chiricahuae). The Southwestern Naturalist, 51(4), 531--535.
• Pasch, B., & Koprowski, J. L. (2006). ANNUAL CYCLES IN BODY MASS AND REPRODUCTION OF CHIRICAHUA FOX SQUIRRELS (SCIURUS NAYARITENSIS CHIRICAHUAE). Southwestern Naturalist. doi:10.1894/0038-4909(2006)51[531:acibma]2.0.co;2
• Pasch, B., & Koprowski, J. L. (2006). SEX DIFFERENCES IN SPACE USE OF CHIRICAHUA FOX SQUIRRELS. Journal of Mammalogy. doi:10.1644/05-mamm-a-121r1.1
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  Sex differences in reproductive investment influence space use patterns of many animals. In polygynous mammals, male space use reflects distribution of females and female space use reflects relative distribution of food. We used radiotelemetry to examine seasonal patterns of home-range size, overlap, and distance traveled by male and female Chiricahua fox squirrels (Sciurus nayaritensis chiricahuae) from 2002 to 2003. Male and female home-range and core-area size varied little between nonmating and mating seasons. Female core areas had a greater percentage overlap by males than by females during mating and nonmating seasons. Males traveled farther in the mating season and females showed little variation between seasons. Extreme spatial and temporal fluctuations of food experienced by Chiricahua fox squirrels may result in space use patterns that differ from those of tree squirrels living in forests with a greater abundance of food.
• Pasch, B., & Koprowski, J. L. (2006). Sex differences in space use of Chiricahua fox squirrels. Journal of Mammalogy, 87(2), 380--386.
• Pasch, B. S., & Koprowski, J. L. (2005). Correlates of vulnerability in Chiricahua fox squirrels. Connecting mountain islands and desert seas: biodiversity and management of the Madrean Archipelago II. Proceedings RMRS-P-36 (GJ Gottfried, BS Gebow, LG Eskew, and C. Edminster, eds.). United States Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fort Collins, Colorado, 426--428.

Proceedings Publications

• Abbasi, M. Z., Pasch, B., Humber, A., Ryan, M. J., & Wilson, P. S. (2014). A subtraction technique for removing playback noise from high-frequency rodent recordings. In Acoustical Society of America.
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  The efficacy of animal communication often necessitates signalers to adjust signals. For example, many vertebrates modify vocal output to minimize interference from ambient noise (e.g., Lombard effect) or in response to other signaling animals. Such auditory-feedback-mediated vocal control is well documented in songbirds, humans, and nonhuman primates, but has not been explored in rodents. Alston's singing mouse (Scotinomys teguina) emit advertisement vocalizations that function in mate attraction and male-male aggression, and can vary both temporal and spectral features depending on the social context. In this experiment, we investigated the extent to which mice can modify vocal output in response to perturbations in auditory feedback by broadcasting conspecific vocalizations that overlapped a focal male's song. However, an unexpected challenge was found in separating the mouse's vocalization from the broadcast stimuli. Other studies have used Golay codes to measure the impulse response of the system and subtract the noise. However, such techniques could not be applied herein due to the high frequencies produced by mice; movement of the mouses' head appears to change the system sufficiently to prevent effective subtraction. The authors will present a novel method using spectral envelopes and cross-correlation procedures to garner feedback on the validity of this technique.
• Pasch, B., Campbell, P., Abbasi, M. Z., Wilson, P. S., Phelps, S., & Ryan, M. J. (2014). Sources of acoustic variation in the advertisement vocalizations of Neotropical singing mice. In Acoustical Society of America.
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  Patterns of variation in communication systems provide important insight into the processes that shape phenotypic evolution. Although studies in anurans, birds, and insects indicate that diverse selective and stochastic forces influence acoustic signals, factors that shape variation in mammalian vocalizations are poorly understood. Neotropical singing mice (Scotinomys) are diurnal, insectivorous rodents distributed throughout montane cloud forests of Middle America. Males commonly emit species-specific advertisement vocalizations that are used in mate attraction and male-male aggression. To explore factors contributing to vocal variation, we summarize data from a diversity of studies at disparate scales and levels of analysis. We highlight the importance of genetic drift in shaping population differentiation, the role of androgens in modulating the performance of physically challenging displays, the influence of social context in shaping posture and vocal parameters, and the impact of the ambient environment in affecting sound propagation. Neotropical singing mice are emerging as an important model that enables us to draw parallels to vocal communication systems in traditionally more tractable species.
• Pino, J. L., Soto-Centeno, A., & Pasch, B. (2013). Niche differentiation in Neotropical singing mice. In American Society of Mammalogists.
• Pasch, B. (2010). Role of song in the altitudinal replacement of Neotropical singing mice (Scotinomys). In Integrative and Comparative Biology, 50.
• Pasch, B., George, A., Hamlin, H. J., Guillette Jr, ,. L., & Phelps, S. M. (2010). Androgens activate advertisment songs of Neotropical singing mice (Scotinomys). In INTEGRATIVE AND COMPARATIVE BIOLOGY, 50.
• Pino, J. L., Campbell, P. D., Pasch, B., Reed, D., & Phelps, S. (2009). Insights into the evolutionary history of singing mice, Genus Scotinomys. In Congreso 10 Internacional de Mastozoología. Mendoza, Argentina.
• Koprowski, J. L., Edelman, A. J., Pasch, B. S., & Buecher, D. C. (2005). Archipelago: What We Think We Know and What We Actually Do Know. In Connecting Mountain Islands and Desert Seas: Biodiversity and Management of the Madrean Archipelago II and 5th Conference on Research and Resource Management in the Southwestern Deserts: May 11-15, 2004, Tucson, Arizona.
• Koprowski, J. L., Edelman, A. J., Pasch, B., & Beucher, D. C. (2005). A dearth of data on the mammals of the Madrean Archipelago: what do we think we know and what we actually do know. In Proceedings of the Rocky Mountain Research Station.
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  The Madrean Archipelago harbors one of the most diverse mammalian communities in North America. We used the Web of Science literature search tool to assess the diversity of peer-reviewed publications on mammals in Arizona and New Mexico as an indicator of publica- tions in the region. The number of publications of all mammals was lower than expected with a mode of 0 and a median of 1. Species were not studied equally in Arizona with most measures suggesting a disproportionately large number of publications on the Order Artiodactyla and small numbers of publications on the Orders Rodentia and Chiroptera. Large mammals and those found in many Arizona counties tend to be the subject of more publications. Despite the great diversity of the region, a dearth of published data on mammalian species is evidenced within the Madrean Archipelago, especially among the Rodentia and Chiroptera.

Presentations

• Brzozowski, R., Kobrina, A., Mahoney, S., & Pasch, B. (2023). Advertising and receiving from heights increases transmission of vocalizations in semi-arboreal mice.. Joint Meeting of the Arizona/New Mexico Wildlife Society. Farmington, NM.
• Brzozowski, R., Pasch, B., & Mahoney, S. (2023). Advertising and receiving from heights increases transmission of vocalizations in semi-arboreal mice. 13th International Mammalogical Congress. Anchorage, AK.
• Kobrina, A., & Pasch, B. S. (2022). Comparative hearing of vocal rodents. American Society of Mammalogists.
• Mahoney, S., & Pasch, B. (2023). Audible distance of red squirrel rattles and impacts of anthropogenic noise.. 13th International Mammalogical Congress. Anchorage, AK..
• Mahoney, S., & Pasch, B. (2023). Toward autonomous monitoring of endangered Mt. Graham red squirrels.. Joint Meeting of the Arizona/New Mexico Wildlife Society. Farmington, NM.
• Pasch, B., & Mahoney, S. (2023). Sound pressure levels and active space of red squirrel rattles.. Joint Meeting of the Arizona/New Mexico Wildlife Society.
• Pasch, B. S. (2022). Transcriptional and microbial responses to changing nutrients in three species of rodents with unique dietary strategies.. Annual Meeting of the Society for Integrative & Comparative Biology..
• Pasch, B. S. (2022). Tuning of the auditory system in relation to vocal and foot-drumming behaviors in white-throated woodrats (Neotoma albigula).. Annual Meeting of the Society for Integrative & Comparative Biology..
• Pasch, B. S. (2021). Grasshopper mice alter vocalizations with age-related and noise-induced hearing loss.. 180th Meeting of the Acoustical Society of America. Acoustics in Focus,..
• Pasch, B. S. (2021). Space use in relation to vocal production and reception in northern pygmy mice (Baiomys taylori).. American Society of Mammalogists Meeting.
• Pasch, B. S. (2021). Understanding how physiological changes contribute to optimal digestion in rodents.. Society for Integrative & Comparative Biology Annual Meeting..
• Pasch, B. S. (2020). Assessing geographic variation in song structure and plumage coloration in the Willow Flycatcher species complex.. 53rd Joint Annual Meeting of the Arizona and New Mexico Chapters of the Wildlife Society and American Fisheries Society Student.. Prescott, AZ.
• Pasch, B. S. (2020). Investigating the mechanisms of diet-induced metabolic depression in wild rodents.. Society for Integrative & Comparative Biology.. Austin, TX, USA.
• Pasch, B. S. (2020). Modulation of digestive enzyme activities in response to diet composition in three species of rodents with different feeding strategies.. Annual Biomedical Research Conference for Minority Students.
• Pasch, B. S. (2020). Nutrient manipulation differentially affects microbiome structure and host physiology in rodents with distinct dietary niches.. Society for Integrative & Comparative Biology.. Austin, TX, USA..
• Pasch, B. S. (2020). Pygmy mouse songs reveal anatomical innovations underlying acoustic signal elaboration in rodents.. Animal Behavior Society..
• Pasch, B. S. (2019). Assessing geographic variation in song structure and plumage coloration in the Willow Flycatcher species complex.. Association of Field Ornithology.. Cape May, NJ, USA..
• Pasch, B. S. (2019). Dynamic properties of rodent vocalizations are fundamental to understanding development, function, mechanisms and evolution of acoustic communication.. Animal Behavior Society Meeting. University of Illinois at Chicago, Chicago, IL, USA..
• Pasch, B. S. (2019). Nutrient manipulation differentially affects gut anatomy and microbiome structure in rodents with distinct dietary niches.. The Wildlife Society Conference.. Reno, NV, USA..
• Pasch, B. S. (2018). Active space of grasshopper mouse vocalizations in relation to woody plant encroachment.. American Society of Mammalogists.. Kansas State University..
• Pasch, B. S. (2018). Active space of grasshopper mouse vocalizations.. Animal Behavior Society.. University of Wisconsin-Milwaukee, USA..
• Pasch, B. S. (2018). Active space of grasshopper mouse vocalizations.. Animal Behavior Society.. University of Wisconsin-Milwaukee..
• Pasch, B. S. (2018). Behavioral and physiological mechanisms of reproductive isolation in grasshopper mice.. Department of Physiology, Midwestern University Seminar Series.. Midwestern University, Glendale.
• Pasch, B. S. (2018). Behavioral responses to advertisement vocalizations among sympatric grasshopper mice (Onychomys).. American Society of Mammalogists.. Kansas State University..
• Pasch, B. S. (2018). Biology of long-distance communication in vocal rodents.. Invited Seminar Speaker, Department of Biology and Cellular and Behavioral Neurobiology Program. University of Oklahoma, Norman, OK, USA..
• Pasch, B. S. (2018). Grasshopper mice exhibit sex differences and similarities in behavioral responses to playbacks. American Society of Mammalogists. Kansas State University..
• Pasch, B. S. (2018). Sex differences and similarities in behavioral responses to playbacks in grasshopper mice.. Joint Meeting of the Arizona/New Mexico Wildlife Society.. Flagstaff, AZ..
• Pasch, B. S. (2018). The active space of grasshopper mouse vocalizations and implications of woody plant encroachment.. Joint Meeting of the Arizona/New Mexico Wildlife Society.. Flagstaff, AZ..
• Pasch, B. S. (2017). A matched filter between call frequency and auditory sensitivity in northern grasshopper mice (Onychomys leucogaster).. 97th Annual Meeting of the American Society of Mammalogists.. University of Idaho, Moscow, Idaho..
• Pasch, B. S. (2017). Acoustic partitioning in a desert rodent community.. 97th Annual Meeting of the American Society of Mammalogists.. University of Idaho, Moscow, Idaho..
• Pasch, B. S. (2017). Building a silent desert for behavioral studies of vocal rodents.. 97th Annual Meeting of the American Society of Mammalogists. University of Idaho, Moscow, Idaho..
• Pasch, B. S. (2017). The active space of grasshopper mouse vocalizations and implications of woody plant encroachment.. 14th Biennial Conference of Science and Management for the Colorado Plateau and Southwest Region.. Flagstaff, AZ..
• Pasch, B. S. (2017). The influence of social context on call amplitude in grasshopper mice (Onychomys).. 97th Annual Meeting of the American Society of Mammalogists.. University of Idaho, Moscow, Idaho..
• Pasch, B. S. (2016). . Acoustic partitioning in a desert rodent community.. Southwest Brain, Cognition, and Vocal Behavior Meeting..
• Pasch, B. S. (2016). Acoustic partitioning and reproductive isolation in grasshopper mice.. Department of Biology, New Mexico State University Departmental Seminar Series. Las Cruces, New Mexico..
• Pasch, B. S. (2016). Acoustic partitioning in a desert rodent community. Annual Meeting of the Animal Behavior Society.. Columbia, Missouri..
• Pasch, B. S. (2016). Mechanisms of character displacement in senders and receivers: Insights from vocal rodents. NAU Department of Biology Seminar Series.. NAU.
• Pasch, B. S. (2016). Wolves of the rodent world: Species differences in grasshopper mouse howls and prospects for automated monitoring of an indicator species.. Joint Meeting of the Arizona/New Mexico Wildlife Society.. Flagstaff, AZ..
• Pasch, B. S. (2015). Behavioral isolating mechanisms in voluble grasshopper mice: A corrido.. Cornell University, Department of Ecology & Evolutionary Biology EvoGroup Seminar Series.. Cornell University..
• Pasch, B. S. (2015). Behavioral strategies used by Neotropical singing mice (Scotinomys) to maximize sound propagation.. 95th Annual Meeting of the American Society of Mammalogists.. Jacksonville, FL..
• Pasch, B. S. (2015). Species differences in close-distance mating vocalizations in grasshopper mice (Onychomys).. 95th Annual Meeting of the American Society of Mammalogists.. Jacksonville, FL..
• Pasch, B. S. (2014). From genes to communities: Biology of acoustic communication in vocal rodents.. Cornell University, Neurobiology and Behavior Seminar Series..
• Pasch, B. S. (2014). Sources of acoustic variation in the advertisement vocalizations of Neotropical singing mice.. Annual Meeting of the Acoustical Society of America.. Providence, RI..
• Pasch, B. S. (2014). Steering sound beams: The influence of social context on acoustic radiation patterns in Neotropical singing mice.. Society of Integrative and Comparative Biology.. Austin, TX..
• Pasch, B. S. (2013). The influence of social context on acoustic radiation patterns in Neotropical singing mice.. 93rd Annual Meeting of the American Society of Mammalogists.. Philadelphia, PA..
• Pasch, B. S. (2012). ASM Fellowship Plenary Address: From genes to communities: Integrative biology of acoustic communication in Neotropical singing mice.. 92nd Annual Meeting of the American Society of Mammalogists.. Reno, NV..
• Pasch, B. S. (2012). From genes to communities: Integrative biology of acoustic interactions in Neotropical singing mice.. UT Austin Center for Brain, Behavior, and Evolution 2nd Annual Symposium.. University of Texas, Austin, USA..
• Pasch, B. S. (2012). Hitting the high notes: Causes and consequences of vocal performance variation in Neotropical singing mice. Allee Session at the 49th Annual Meeting of the Animal Behavior Society.. Albuquerque, NM..
• Pasch, B. S. (2011). Androgens modulate song effort and vocal performance in Neotropical singing mice.. UT Austin Center for Brain, Behavior, and Evolution 1st Annual Symposium.. Austin, TX..
• Pasch, B. S. (2011). Ecological variation in species recognition and auditory processing in Alston’s singing mouse, Scotinomys teguina.. Society for Neuroscience Annual Meeting.. Washington, D.C..
• Pasch, B. S. (2011). Interspecific dominance and song interactions mediate altitudinal zonation in Neotropical singing mice.. Animal Behavior Society Annual Meeting.. Bloomington, IN..
• Pasch, B. S. (2011). Shadle Fellowship Plenary: Acoustic communication mediates altitudinal zonation in Neotropical singing mice.. 91st Annual Meeting of the American Society of Mammalogists.

Poster Presentations

• Almeida, R., Mahoney, S., & Pasch, B. (2023). Uncoupling the airborne & seismic components of banner-tailed kangaroo rat footdrums. 19th Annual Symposium on Research Insights in Semiarid Ecosystems. The University of Arizona, Tucson, AZ..
• Pasch, B. S. (2021). Sound production and propagation in vocal rodents of Arizona. NSF REU Poster Session.
• Pasch, B. S. (2020). Laryngeal cartilage mineralization: effects of age, obesity, exercise, and species differences.. National Veterinary Scholars Symposium, Association of American Veterinary Medical Colleges Annual Meeting..
• Pasch, B. S. (2020). The contribution of vocal fold size to variation in call frequency.. NAU UGRADS Poster Session. Flagstaff, AZ.
• Pasch, B. S. (2019). Exploring the anatomy of vocal differences among sympatric grasshopper mice.. NAU UGRADS Poster Session.
• Pasch, B. S. (2019). How mice sing and why it matters.. American Society of Mammalogists.. Washington, D.C., USA..
• Pasch, B. S. (2019). Song variation in willow flycatchers supports the acoustic adaptation hypothesis.. 15th Biennial Conference of Science & Management for the Colorado Plateau & Southwest Region. Flagstaff, AZ.
• Pasch, B. S. (2019). The influence of titin on vocalizations of neonate mice.. NAU UGRADS Poster Session..
• Pasch, B. S. (2018). Geometric morphometrics applied to laryngeal functional morphology.. 11th International Conference on Voice Physiology and Biomechanics.. Michigan State University.
• Pasch, B. S. (2018). The shape of silence: A study of rodent laryngeal structure.. Arizona Imaging and Microanalysis Society Meeting.. Flagstaff, AZ.
• Pasch, B. S. (2017). Airway reconstruction in vocal organs.. Dr. Kenneth A. Suarez Midwestern University Research Day.. Midwestern University, Glendale, AZ..
• Pasch, B. S. (2017). An extended matched filter between call frequency and auditory sensitivity in northern grasshopper mice.. Physiological Society Meeting. Flagstaff, AZ.
• Pasch, B. S. (2017). Hearing sensitivities of sympatric grasshopper mice (genus Onychomys).. 97th Annual Meeting of the American Society of Mammalogists.. University of Idaho, Moscow, Idaho..
• Pasch, B. S. (2017). Variation in advertisement calls across the estrous cycle in grasshopper mice.. NAU UGRAD Symposium. NAU..
• Pasch, B. S. (2017). Vocal production in grasshopper mice.. 4th International Symposium on Acoustic Communication by Animals.. Omaha, NE.
• Pasch, B. S. (2016). Grasshopper mice employ distinct vocal production mechanisms in different social contexts. Arizona Physiological Society Meeting. Tucson, AZ..
• Pasch, B. S. (2016). Phlebotomy via tail tip amputation performs comparably or superior to facial vein puncture and tail vein incision.. American Association for Laboratory Animal Science Quad Symposium.. Uncasville, CT..
• Pasch, B. S. (2016). Variation in advertisement calls across the estrous cycle in grasshopper mice.. Arizona Physiological Society Meeting.. Tucson, AZ..
• Pasch, B. S. (2015). Vocal ontogeny in grasshopper mice (Onychomys).. 95th Annual Meeting of the American Society of Mammalogists.. Jacksonville, FL..
• Pasch, B. S. (2013). Social experience modulates acoustic signaling in Alston’s singing mouse.. 17th Annual Meeting of the Society for Behavioral Neuroendocrinology.. Atlanta, GA..
• Pasch, B. S. (2012). Prenatal inactivation of androgen receptor activity feminizes external genitalia but masculinizes brain development.. Sixth International Meeting on Vertebrate Sex Determination.. Kona, Hawaii.
• Pasch, B. S. (2012). Social context influences FOXP2 neuronal activation in response to auditory stimuli. 16th Annual Meeting of the Society for Behavioral Neuroendocrinology.. Madison, WI..
• Pasch, B. S. (2013). Singing mice steer sound beams toward vocal rivals. UT Austin Center for Brain, Behavior, and Evolution 3rd Annual Symposium.. University of Texas, Austin, TX.
• Pasch, B. S. (2011). Integrative biology of acoustic communication in Neotropical singing mice. 3rd Symposium on Acoustic Communication by Animals.. Cornell University, Ithaca, NY.
• Pasch, B. S. (2011). Neural mechanisms of species recognition in Neotropical singing mice.. Opportunities and Challenges in Social Neuroscience.. Utrecht, Netherlands..
• Pasch, B. S. (2011). Transient inactivation of androgen receptor during mouse development feminizes external genitalia but masculinizes brain.. University of Florida Genetics Symposium. Gainesville, FL.

Reviews

• Pasch, B. S. (2012. The influence of fundamental traits on mechanisms controlling appendage regeneration.. BIOLOGICAL REVIEWS..

Others

• Pasch, B. S. (2010, Spring). Androgens activate advertisment songs of Neotropical singing mice (Scotinomys).. INTEGRATIVE AND COMPARATIVE BIOLOGY.
• Pasch, B. S. (2010, Spring). Role of song in the altitudinal replacement of Neotropical singing mice (Scotinomys)..