Predicting the effects of temperature on food web connectance
- 12 July 2010
- journal article
- Published by The Royal Society in Philosophical Transactions Of The Royal Society B-Biological Sciences
- Vol. 365 (1549), 2081-2091
- https://doi.org/10.1098/rstb.2010.0011
Abstract
Few models concern how environmental variables such as temperature affect community structure. Here, we develop a model of how temperature affects food web connectance, a powerful driver of population dynamics and community structure. We use the Arrhenius equation to add temperature dependence of foraging traits to an existing model of food web structure. The model predicts potentially large temperature effects on connectance. Temperature-sensitive food webs exhibit slopes of up to 0.01 units of connectance per 1°C change in temperature. This corresponds to changes in diet breadth of one resource item per 2°C (assuming a food web containing 50 species). Less sensitive food webs exhibit slopes down to 0.0005, which corresponds to about one resource item per 40°C. Relative sizes of the activation energies of attack rate and handling time determine whether warming increases or decreases connectance. Differences in temperature sensitivity are explained by differences between empirical food webs in the body size distributions of organisms. We conclude that models of temperature effects on community structure and dynamics urgently require considerable development, and also more and better empirical data to parameterize and test them.Keywords
This publication has 66 references indexed in Scilit:
- Universal constant for heat production in protistsProceedings of the National Academy of Sciences of the United States of America, 2009
- Mean mass-specific metabolic rates are strikingly similar across life's major domains: Evidence for life's metabolic optimumProceedings of the National Academy of Sciences of the United States of America, 2008
- Complex food webs prevent competitive exclusion among producer speciesProceedings Of The Royal Society B-Biological Sciences, 2008
- Global-scale predictions of community and ecosystem properties from simple ecological theoryProceedings Of The Royal Society B-Biological Sciences, 2008
- Size, foraging, and food web structureProceedings of the National Academy of Sciences of the United States of America, 2008
- Climate-driven warming during spring destabilises a Daphnia population: a mechanistic food web approachOecologia, 2006
- Foraging biology predicts food web complexityProceedings of the National Academy of Sciences of the United States of America, 2006
- Effects of experimental greenhouse warming on phytoplankton and zooplankton communities in fishless alpine pondsLimnology and Oceanography, 2004
- TOWARD A METABOLIC THEORY OF ECOLOGYEcology, 2004
- Body Size and Consumer-Resource DynamicsThe American Naturalist, 1992