Marie L. Westover

Most mammals do not wander: few species escape continental endemism

Meghan A. Balk, Melissa I. Pardi, Catalina P. Tomé, John M. Grady et autres

Terrestrial mammals are found nearly everywhere on Earth. Yet, most taxa are endemic to a single continent; geological, evolutionary, ecological, or physiological filters constrain geographic distributions. Here, we synthesize data on geography, taxonomy, lineage age, dispersal, body size, and diet for > …

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Combining past and contemporary species occurrences with ordinal species distribution modeling to investigate responses to climate change

Erik A. Beever, Marie L. Westover, Adam B. Smith, Francis D. Gerraty et autres

Many organisms leave evidence of their former occurrence, such as scat, abandoned burrows, middens, ancient eDNA or fossils, which indicate areas from which a species has since disappeared. However, combining this evidence with contemporary occurrences within a single modeling framework remains challenging. …

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Spatio-temporal variability in the strength, directionality, and relative importance of climate on occupancy and population densities in a philopatric mammal, the American pika (Ochotona princeps)

Peter D. Billman, Erik A. Beever, Marie L. Westover, Dylan K. Ryals

Species distribution models (SDMs) have been widely employed to evaluate species–environment relationships. However, when extrapolated over broad spatial scales or through time, these models decline in their predictive ability due to variation in how species respond to their environment. Many models assume …

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Geographic and taxonomic variation in adaptive capacity among mountain-dwelling small mammals: Implications for conservation status and actions

Erik A. Beever, Jennifer L. Wilkening, Peter D. Billman, Lindsey L. Thurman et autres

Contemporary climate change is modifying the distribution, morphology, phenology, physiology, evolution, and interspecific interactions of species. Effects of climate change are mediated not only through the magnitude of change experienced (exposure) and an animal's sensitivity to such changes, but also through the …

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Isotopic niche of the American pika (Ochotona princeps) through space and time

Marie L. Westover, K.A. Lizewski, Kelly B. Klingler, Felisa A. Smith

Anthropogenic climate change is influencing the ecology and distribution of animals. The American pika (Ochotona princeps (Richardson, 1828)) is considered a model species for studying the effects of climate on small alpine mammals and has experienced local extirpation across its range. Using …

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Investigating the role of environment in pika (Ochotona) body size patterns across taxonomic levels, space, and time

Marie L. Westover, Felisa A. Smith

Abstract Body size is an important trait in animals because it influences a multitude of additional life history traits. The causal mechanisms underlying body size patterns across spatial, temporal, and taxonomic hierarchies are debated, and of renewed interest in this era of …

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Alternatives to genetic affinity as a context for within-species response to climate

Adam B. Smith, Erik A. Beever, Mimi Kessler, Aaron N. Johnston et autres

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Discovery of the Yellow-Bellied Marmot (Marmota flaviventris) in the Jemez Mountains, New Mexico: Examining Competing Hypotheses for Range Extension

Jennifer K. Frey, Erik A. Beever, Charles Hathcock, Robert Parmenter et autres

The yellow-bellied marmot (Marmota flaviventris) reaches the southern edge of its geographic range in New Mexico, where it is known from the San Juan and Sangre de Cristo Mountains. We provide a synopsis of the geographic range of M. flaviventris in New …

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Biogeographical implications of climate change for an alpine mammal, the American pika

Marie L. Westover

Anthropogenic climate change has already impacted a majority of species globally. The aim of this dissertation is to understand how climate and climate change influences animal ecology and evolution across space and time, using the American pika (Ochotona. princeps) as a model …

Exploring the influence of ancient and historic megaherbivore extirpations on the global methane budget

Felisa A. Smith, John I. Hammond, Meghan A. Balk, Scott Elliott et autres

Globally, large-bodied wild mammals are in peril. Because "megamammals" have a disproportionate influence on vegetation, trophic interactions, and ecosystem function, declining populations are of considerable conservation concern. However, this is not new; trophic downgrading occurred in the past, including the African rinderpest …

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