Foraging on spatially distributed resources with sub-optimal movement, imperfect information, and travelling costs: Departures from the ideal free distribution

9206 10 66965 2 185979 document 66965 Foraging on spatially distributed resources with sub-optimal movement, imperfect information, and travelling costs departures from the ideal free distribution.pdf application/pdf 2e2a950183facdd6bbdf32267b698089 MD5 1268905 2016-07-22 12:05:33 https://pure.iiasa.ac.at/id/eprint/9206/1/Foraging%20on%20spatially%20distributed%20resources%20with%20sub-optimal%20movement%2C%20imperfect%20information%2C%20and%20travelling%20costs%20departures%20from%20the%20ideal%20free%20distribution.pdf 9206 1 1 application/pdf text en public cc_by

Foraging on spatially distributed resources with sub-optimal movement, imperfect information, and travelling costs departures from the ideal free distribution.pdf

published 66966 2 185982 document 66966 lightbox.jpg image/png e20a07028fce5b1ddef616e7050c1102 MD5 60986 2016-07-22 12:05:59 https://pure.iiasa.ac.at/id/eprint/9206/2/lightbox.jpg 9206 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox en public

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/66965 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/66965 http://eprints.org/relation/isIndexCodesVersionOf https://pure.iiasa.ac.at/id/document/66965 archive 351 disk0/00/00/92/06 2016-01-15 08:43:51 2021-08-27 17:21:14 2016-01-15 08:43:51 article show 1 Matsumura S. 1841 Arlinghaus R. 8009 Dieckmann U. 1668 0000-0001-7089-0393 Foraging on spatially distributed resources with sub-optimal movement, imperfect information, and travelling costs: Departures from the ideal free distribution pub iis_ecl prog_eep Ideal free distribution (IFD) theory offers an important baseline for predicting the distribution of foragers across resource patches. Yet it is well known that IFD theory relies on several over-simplifying assumptions that are unlikely to be met in reality. Here we relax three of the most critical assumptions: (1) optimal foraging moves among patches, (2) omniscience about the utility of resource patches, and (3) cost-free travelling between patches. Based on these generalizations, we investigate the distributions of a constant number of forgers in models with explicit resource dynamics of logistic type. We find that, first, when foragers do not always move to the patch offering maximum intake rate (optimal foraging), but instead move probabilistically according to differences in resource intake rates between patches (sub-optimal foraging), the distribution of foragers becomes less skewed than the IFD, so that high-quality patches attract fewer foragers. Second, this homogenization is strengthened when foragers have less than perfect knowledge about the utility of resource patches. Third, and perhaps most surprisingly, the introduction of travelling costs causes departures in the opposite direction: the distribution of sub-optimal foragers approaches the IFD as travelling costs increase. We demonstrate that these three findings are robust when considering patches that differ in the resources carrying capacity or intrinsic growth rate, and when considering simple two-patch and more complex multiple-patch models. By overcoming three major over-simplifications of IFD theory, our analyses contribute to the systematic investigation of ecological factors influencing the spatial disribution of foragers, and thus help in deriving new hypotheses that are testable in empirical systems. A confluence of theoretical and empirical studies that go beyond classical IFD theory is essential for improving insights into how animal distributions across resource patches are determined in nature. 2010-09 published Wiley-Blackwell 10.1111/j.1600-0706.2010.18196.x XJ-10-104 Oikos; 119(9):1469-1483 (September 2010) (Published online 13 April 2010) [doi:10.1111/j.1600-0706.2010.18196.x] 1439 1130 66 public Oikos 119 9 1469-1483 TRUE 1600-0706 FALSE info:eu-repo/semantics/article