Jeffrey Brian Stetz

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A fundamental challenge to estimating population size with mark-recapture methods is heterogeneous capture probabilities and subsequent bias of population estimates. Confronting this problem usually requires substantial sampling effort that can be difficult to achieve for some species, such as carnivores. We developed a methodology that uses two data(More)
We evaluated the potential of two noninvasive genetic sampling methods, hair traps and bear rub surveys, to estimate population abundance and trend of grizzly (Ursus arctos) and black bear (U. americanus) populations in Banff National Park, Alberta, Canada. Using Huggins closed population mark-recapture models, we obtained the first precise abundance(More)
Neglect of Genetic Diversity in Implementation of the Convention on Biological Diversity LINDA LAIKRE,∗ FRED W. ALLENDORF,† LAUREL C. ARONER,† C. SCOTT BAKER,‡ DAVID P. GREGOVICH,§ MICHAEL M. HANSEN,∗∗ JENNIFER A. JACKSON,‡ KATHERINE C. KENDALL,†† KEVIN MCKELVEY,‡‡ MAILE C. NEEL,§§ ISABELLE OLIVIERI,∗∗∗ NILS RYMAN,∗ MICHAEL K. SCHWARTZ,‡‡ RUTH SHORT BULL,†(More)
We present the first rigorous estimate of grizzly bear (Ursus arctos) population density and distribution in and around Glacier National Park (GNP), Montana, USA. We used genetic analysis to identify individual bears from hair samples collected via 2 concurrent sampling methods: 1) systematically distributed, baited, barbed-wire hair traps and 2) unbaited(More)
Using multiple detection methods can increase the number, kind, and distribution of individuals sampled, which may increase accuracy and precision and reduce cost of population abundance estimates. However, when variables influencing abundance are of interest, if individuals detected via different methods are influenced by the landscape differently,(More)
LINDA LAIKRE,∗ FRED W. ALLENDORF,† LAUREL C. ARONER,† C. SCOTT BAKER,‡ DAVID P. GREGOVICH,§ MICHAEL M. HANSEN,∗∗ JENNIFER A. JACKSON,‡ KATHERINE C. KENDALL,†† KEVIN McKELVEY,‡‡ MAILE C. NEEL,§§ ISABELLE OLIVIERI,∗∗∗ NILS RYMAN,∗ MICHAEL K. SCHWARTZ,‡‡ RUTH SHORT BULL,† JEFFREY B. STETZ,†† DAVID A. TALLMON,††† BARBARA L. TAYLOR,§ CHRISTINA D. VOJTA,‡‡‡(More)
Monitoring our natural resources will increasingly rely on genetic tools in order to understand and respond to invasive species, habitat degradation, fragmentation, disease, or climate-related changes. In recent years, the rapidly evolving field of genetic monitoring has seen explosive growth in sampling methods, genetic markers, and analytical approaches(More)
Many North American river otter (Lontra canadensis) populations are threatened or recovering but are difficult to study because they occur at low densities, it is difficult to visually identify individuals, and they inhabit aquatic environments that accelerate degradation of biological samples. Single nucleotide polymorphisms (SNPs) can improve our ability(More)
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