e-journal

Predicting local and non-local effects of resources on animal space use using amechanistic step selection model

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1. Predicting space use patterns of animals from their interactions with the environment is fundamental for
understanding the effect of habitat changes on ecosystem functioning. Recent attempts to address this problem
have sought to unify resource selection analysis,where animal space use is derived from available habitat quality,
andmechanistic movement models, where detailedmovement processes of an animal are used to predict its emergent
utilization distribution. Such models bias the animal’s movement towards patches that are easily available
and resource-rich, and the result is a predicted probability density at a given position being a function of the habitat quality at that position. However, in reality, the probability that an animal will use a patch of the terrain tends to be a function of the resource quality in both that patch and the surrounding habitat.
2. We propose a mechanistic model where this non-local effect of resources naturally emerges from the local
movement processes, by taking into account the relative utility of both the habitat where the animal currently
resides and that of where it is moving. We give statistical techniques to parametrize themodel from location data
and demonstrate application of these techniques to GPS location data of caribou (Rangifer tarandus) in Newfoundland.
3. Steady-state animal probability distributions arising from the model have complex patterns that cannot be
expressed simply as a function of the local quality of the habitat. In particular, large areas of good habitat are
used more intensively than smaller patches of equal quality habitat, whereas isolated patches are used less frequently. Both of these are real aspects of animal space use missing from previous mechanistic resource selection models.
4. Whilst we focus on habitats in this study, ourmodelling framework can be readily used with any environmental
covariates and therefore represents a unification of mechanistic modelling and step selection approaches to
understanding animal space use.

Key-words: animal movement, caribou (Rangifer tarandus), master equation, mechanistic models,resource selection analysis, step selection functions

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Ketersediaan

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Informasi Detail

Judul Seri

Methods in Ecology and Evolution

No. Panggil

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Penerbit

: John Wiley & Sons, Ltd.., 2014

Deskripsi Fisik

Methods in Ecology and Evolution 2014, 5, 253–262

Bahasa

English

ISBN/ISSN

doi: 10.1111/2041-21

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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