منابع مشابه
Food-chain length and adaptive foraging.
Food-chain length, the number of feeding links from the basal species to the top predator, is a key characteristic of biological communities. However, the determinants of food-chain length still remain controversial. While classical theory predicts that food-chain length should increase with increasing resource availability, empirical supports of this prediction are limited to those from simple...
متن کاملResponse: habitat compartmentation and envitonmental correlates of food chain length.
25, 27, and 40), three of which appear incomplete, followed by relatively complete aquatic habitats with longer chains. For the two-dimensional webs, seven out of eight webs are incomplete (terrestrial habitats, marshes, and the rocky intertidal). We suggest that the three-dimensional food web descriptions, particularly those of webs in open seas, more completely reflect real food webs, while t...
متن کاملHabitat compartmentation and environmental correlates of food chain length.
REFERENCES given preference. A considerable amount of 1 C. H. Greene, P. H. Wiebe, J. Burczynski, M. J. work by oceanographers and fishery scienYoungbluth, Science 241, 359 (1988). tists must be done before the role of krill in 2. E. S. Hobson, ibid. the Georges Bank food chain can be fully 3. J. D. Isaacs and R. A. Schwartzlose, ibid. 150, 1810 (1965); A. Genin, L. Haury, P. Greenblatt, Deepap...
متن کاملEvolutionary consequences of food chain length in kelp forest communities.
Kelp forests are strongly influenced by macroinvertebrate grazing on fleshy macroalgae. In the North Pacific Ocean, sea otter predation on macroinvertebrates substantially reduces the intensity of herbivory on macroalgae. Temperate Australasia, in contrast, has no known predator of comparable influence. These ecological and biogeographic patterns led us to predict that (i) the intensity of herb...
متن کاملConstraints on food chain length arising from regional metacommunity dynamics.
Classical ecological theory has proposed several determinants of food chain length, but the role of metacommunity dynamics has not yet been fully considered. By modelling patchy predator-prey metacommunities with extinction-colonization dynamics, we identify two distinct constraints on food chain length. First, finite colonization rates limit predator occupancy to a subset of prey-occupied site...
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ژورنال
عنوان ژورنال: Proceedings of the Royal Society B: Biological Sciences
سال: 2009
ISSN: 0962-8452,1471-2954
DOI: 10.1098/rspb.2009.0482