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Accounting for phenology in the analysis of animal movement.
Scharf, Henry R; Hooten, Mevin B; Wilson, Ryan R; Durner, George M; Atwood, Todd C.
Afiliação
  • Scharf HR; Department of Statistics, Colorado State University, Fort Collins, Colorado.
  • Hooten MB; Department of Statistics, Colorado State University, Fort Collins, Colorado.
  • Wilson RR; Department of Fish, Wildlife, and Conservation Biology, Colorado Cooperative Fish and Wildlife Research Unit, U.S. Geological Survey, Fort Collins, Colorado.
  • Durner GM; Marine Mammals Management, U.S. Fish and Wildlife Service, Anchorage, Alaska.
  • Atwood TC; Alaska Science Center, U.S. Geological Survey, Anchorage, Alaska.
Biometrics ; 75(3): 810-820, 2019 09.
Article em En | MEDLINE | ID: mdl-30859552
ABSTRACT
The analysis of animal tracking data provides important scientific understanding and discovery in ecology. Observations of animal trajectories using telemetry devices provide researchers with information about the way animals interact with their environment and each other. For many species, specific geographical features in the landscape can have a strong effect on behavior. Such features may correspond to a single point (eg, dens or kill sites), or to higher dimensional subspaces (eg, rivers or lakes). Features may be relatively static in time (eg, coastlines or home-range centers), or may be dynamic (eg, sea ice extent or areas of high-quality forage for herbivores). We introduce a novel model for animal movement that incorporates active selection for dynamic features in a landscape. Our approach is motivated by the study of polar bear (Ursus maritimus) movement. During the sea ice melt season, polar bears spend much of their time on sea ice above shallow, biologically productive water where they hunt seals. The changing distribution and characteristics of sea ice throughout the year mean that the location of valuable habitat is constantly shifting. We develop a model for the movement of polar bears that accounts for the effect of this important landscape feature. We introduce a two-stage procedure for approximate Bayesian inference that allows us to analyze over 300 000 observed locations of 186 polar bears from 2012 to 2016. We use our model to estimate a spatial boundary of interest to wildlife managers that separates two subpopulations of polar bears from the Beaufort and Chukchi seas.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Estações do Ano / Migração Animal Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Biometrics Ano de publicação: 2019 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Estações do Ano / Migração Animal Tipo de estudo: Prognostic_studies Limite: Animals Idioma: En Revista: Biometrics Ano de publicação: 2019 Tipo de documento: Article