Quantifying individual specialization using tracking data: a case study on two species of albatrosses

Marine Biology
A-S Bonnet-LebrunA S L Rodrigues

Abstract

Many predictive models of spatial and temporal distribution (e.g. in response to climate change or species introductions) assume that species have one environmental niche that applies to all individuals. However, there is growing evidence that individuals can have environmental preferences that are narrower than the species niche. Such individual specialization has mainly been studied in terms of dietary niches, but a recent increase in the availability of individual movement data opens the possibility of extending these analyses to specialisation in environmental preferences. Yet, no study to date on individual specialisation has considered the environmental niche in its multidimensionality. Here we propose a new method for quantifying individual specialisation in multiple dimensions simultaneously. We compare the hypervolumes in n-dimensional environmental niche space of each individual against that of the population, testing for significant differences against a null model. The same method can be applied to a 2-dimensional geographic space to test for site fidelity. We applied this method to test for individual environmental specialisation (across three dimensions: sea surface temperature, eddy kinetic energy, depth) and for...Continue Reading

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Citations

Sep 9, 2020·The Journal of Animal Ecology·Patricia Kerches-RogeriMarco Aurelio Ribeiro Mello

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Software Mentioned

R package
StreamMetabolism
adehabitatLT
R

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