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Size-based predicti...
Size-based predictions of food web patterns
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- Zhang, Lai (författare)
- Department of Applied Mathematics and Computer Science, Technical University of Denmark, Denmark
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Hartvig, Martin (författare)
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Knudsen, Kim (författare)
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Andersen, Ken Haste (författare)
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(creator_code:org_t)
- 2013-07-03
- 2014
- Engelska.
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Ingår i: Theoretical Ecology. - : Springer. - 1874-1738 .- 1874-1746. ; 7:1, s. 23-33
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- We employ size-based theoretical arguments to derive simple analytic predictions of ecological patterns and properties of natural communities: size-spectrum expo- nent, maximum trophic level, and susceptibility to invasive species. The predictions are brought about by assuming that an infinite number of species are continuously distributed on a size–trait axis. It is, however, an open question whether such predictions are valid for a food web with a finite num- ber of species embedded in a network structure. We address this question by comparing the size-based predictions to results from dynamic food web simulations with varying species richness. To this end, we develop a new size- and trait-based food web model that can be simplified into an analytically solvable size-based model. We confirm existing solutions for the size distribution and derive novel predic- tions for maximum trophic level and invasion resistance. Our results show that the predicted size-spectrum exponent is borne out in the simulated food webs even with few species, albeit with a systematic bias. The predicted max- imum trophic level turns out to be an upper limit since simulated food webs may have a lower number of trophic levels, especially for low species richness, due to structural constraints. The size-based model possesses an evolutionary stable state and is therefore un-invadable. In contrast, the food web simulations show that all communities, irrespec- tive of number of species, are equally open to invasions. We use these results to discuss the validity of size-based pre- dictions in the light of the structural constraints imposed by food webs.
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Nyckelord
- Biodiversity
- Food web assembly
- Individual size distribution
- Size spectrum
- Traits
- Maximum trophic level
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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