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• W2765483432 abstract "Abstract Aim To develop a more ecologically realistic approach for estimating the population size of cetaceans and other highly mobile species with dynamic spatial distributions. Location California Current Ecosystem, USA . Methods Conventional spatial density models assume a constant relationship between densities and habitat covariates over some time period, typically a survey season. The estimated population size must change whenever total habitat availability changes. For highly mobile long‐lived species, however, density–habitat relationships likely adjust more rapidly than population size. We developed an integrated population‐redistribution model based on a more ecologically plausible alternative hypothesis: (1) population size is effectively constant over each survey season; (2) if habitat availability changes, then the population redistributes itself following an ideal free distribution process. Thus, the estimated relationship between densities and habitat covariates adjusts rather than population size. We constructed Bayesian hierarchical models corresponding to the conventional and alternative hypotheses and applied them to distance sampling data for Dall's porpoise ( Phocoenoides dalli ), a highly mobile cetacean with distribution patterns closely tied to cool sea‐surface temperatures. Results The Dall's porpoise data provided strong support for the hypothesis based on an ideal free redistribution process. Our results indicate that the population size of Dall's porpoise within the survey region was relatively stable over each summer/fall survey season, but the distribution expanded and contracted with the extent of suitable habitat. Over multiple survey seasons, the model partitioned variation in observed densities among three sources: variation in population size, the density–habitat relationship and measurement error, leading to lower and more ecologically plausible estimates of interannual variation in population size. Main conclusions We conclude that the integrated population‐redistribution model ( IPRM ) presented here represents an ecologically plausible model for use in future assessments of the population size and dynamics of cetaceans and other highly mobile long‐lived species with variable spatial distributions." @default.
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• W2765483432 date "2017-10-17" @default.
• W2765483432 modified "2023-10-08" @default.
• W2765483432 title "Estimation of population size and trends for highly mobile species with dynamic spatial distributions" @default.
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• W2765483432 doi "https://doi.org/10.1111/ddi.12663" @default.
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