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Ecol Lett. 2015 Jun;18(6):545-52. doi: 10.1111/ele.12435. Epub 2015 Apr 12.

How far to go? Determinants of migration distance in land mammals.

Author information

1
Senckenberg Biodiversity and Climate Research Centre, Senckenberg Gesellschaft für Naturforschung, Senckenberganlage 25, 60325, Frankfurt (Main), Germany.
2
Department of Biological Sciences, Goethe University, Max-von-Laue-Straße 9, 60438, Frankfurt (Main), Germany.
3
Department of Biology, University of Maryland, College Park, MD, 20742, USA.
4
Smithsonian Conservation Biology Institute, National Zoological Park, Front Royal, VA, 22630, USA.

Abstract

Animal migration is a global phenomenon, but few studies have examined the substantial within- and between-species variation in migration distances. We built a global database of 94 land migrations of large mammalian herbivore populations ranging from 10 to 1638 km. We examined how resource availability, spatial scale of resource variability and body size affect migration distance among populations. Resource availability measured as normalised difference vegetation index had a strong negative effect, predicting a tenfold difference in migration distances between low- and high-resource areas and explaining 23% of the variation in migration distances. We found a weak, positive effect of the spatial scale of resource variability but no effect of body size. Resource-poor environments are known to increase the size of mammalian home ranges and territories. Here, we demonstrate that for migratory populations as well, animals living in resource-poor environments travel farther to fulfil their resource needs.

KEYWORDS:

Foraging resources; land migrations; mammalian herbivores; migration distance; normalised difference vegetation index; scaling relationships; ungulates

PMID:
25865946
DOI:
10.1111/ele.12435
[Indexed for MEDLINE]

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