Consumer-resource body-size relationships in natural food webs

Brose, UlrichDepartment of Biology, Darmstadt University of Technology, Darmstadt, Germany / Pacific Ecoinformatics and Computational Ecology Lab., Berkeley, CA 94703, United States (author)

It has been suggested that differences in body size between consumer and resource species may have important implications for interaction strengths, population dynamics, and eventually food web structure, function, and evolution. Still, the general distribution of consumer-'resource body-size ratios in real ecosystems, and whether they vary systematically among habitats or broad taxonomic groups, is poorly understood. Using a unique global database on consumer and resource body sizes, we show that the mean body-size ratios of aquatic herbivorous and detritivorous consumers are several orders of magnitude larger than those of carnivorous predators. Carnivorous predator-prey body-size ratios vary across different habitats and predator and prey types (invertebrates, ectotherm, and endotherm vertebrates). Predator-prey body-size ratios are on average significantly higher (1) in freshwater habitats than in marine or terrestrial habitats, (2) for vertebrate than for invertebrate predators, and (3) for invertebrate than for ectotherm vertebrate prey. If recent studies that relate body-size ratios to interaction strengths are general, our results suggest that mean consumer-resource interaction strengths may vary systematically across different habitat categories and consumer types.

Jonsson, TomasHögskolan i Skövde,Institutionen för vård och natur(Swepub:his)jont (author)
Berlow, Eric L.Department of Biology, Darmstadt University of Technology, Darmstadt, Germany / Pacific Ecoinformatics and Computational Ecology Lab., Berkeley, CA 94703, United States / University of California, Merced, Sierra Nevada Research Institute, Yosemite National Park, CA 95389, United States (author)
Warren, PhilipDepartment of Animal and Plant Sciences, University of Sheffield, Sheffield, United Kingdom (author)
Banasek-Richter, CarolinDepartment of Biology, Darmstadt University of Technology, Darmstadt, Germany (author)
Bersier, Louis-FelixDepartment of Biology, Unit of Ecology and Evolution, Fribourg, Switzerland (author)
Blanchard, Julia L.Centre for Environment, Fisheries and Aquaculture Science (CEFAS), Suffolk, United Kingdom (author)
Brey, ThomasAlfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany (author)
Carpenter, Stephen R.Center for Limnology, University of Wisconsin, Madison, WI 53706, United States (author)
Department of Biology, Darmstadt University of Technology, Darmstadt, Germany / Pacific Ecoinformatics and Computational Ecology Lab., Berkeley, CA 94703, United StatesInstitutionen för vård och natur (creator_code:org_t)

In:Ecology: Ecological Society of America esa87:10, s. 2411-24170012-96581939-9170

By the author/editor: Brose, Ulrich; Jonsson, Tomas; Berlow, Eric L.; Warren, Philip; Banasek-Richter, ...; Bersier, Louis-F ...; show more...; Blanchard, Julia ...; Brey, Thomas; Carpenter, Steph ...; show less...

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