Wakefield, E. D. , Phillips, R. A. and Matthiopoulos, J. (2014) Habitat-mediated population limitation in a colonial central-place forager: the sky is not the limit for the black-browed albatross. Proceedings of the Royal Society of London Series B: Biological Sciences, 281(1778), p. 20132883. (doi: 10.1098/rspb.2013.2883) (PMID:24430849) (PMCID:PMC3906941)
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Abstract
Animal populations are frequently limited by the availability of food or of habitat. In central-place foragers, the cost of accessing these resources is distance-dependent rather than uniform in space. However, in seabirds, a widely studied exemplar of this paradigm, empirical population models have hitherto ignored this cost. In part, this is because non-independence among colonies makes it difficult to define population units. Here, we model the effects of both resource availability and accessibility on populations of a wide-ranging, pelagic seabird, the black-browed albatross Thalassarche melanophris. Adopting a multi-scale approach, we define regional populations objectively as spatial clusters of colonies. We consider two readily quantifiable proxies of resource availability: the extent of neritic waters (the preferred foraging habitat) and net primary production (NPP). We show that the size of regional albatross populations has a strong dependence, after weighting for accessibility, on habitat availability and to a lesser extent, NPP. Our results provide indirect support for the hypothesis that seabird populations are regulated from the bottom-up by food availability during the breeding season, and also suggest that the spatio-temporal predictability of food may be limiting. Moreover, we demonstrate a straightforward, widely applicable method for estimating resource limitation in populations of central-place foragers.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Wakefield, Dr Ewan and Matthiopoulos, Professor Jason |
Authors: | Wakefield, E. D., Phillips, R. A., and Matthiopoulos, J. |
College/School: | College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine |
Journal Name: | Proceedings of the Royal Society of London Series B: Biological Sciences |
Publisher: | The Royal Society |
ISSN: | 0962-8452 |
ISSN (Online): | 1471-2954 |
Copyright Holders: | Copyright © 2014 The Authors |
First Published: | First published in Proceedings of the Royal Society of London Series B: Biological Sciences 281(1778):20132883 |
Publisher Policy: | Reproduced under a Creative Commons License |
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