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Interaction strengths in balanced carbon cycles and the absence of a relation between ecosystem complexity and stability

Neutel, Anje-Margriet; Thorne, Michael A.S.. 2014 Interaction strengths in balanced carbon cycles and the absence of a relation between ecosystem complexity and stability. Ecology Letters, 17 (6). 651-661. 10.1111/ele.12266

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Abstract/Summary

The strength of interactions is crucial to the stability of ecological networks. However, the patterns of interaction strengths in mathematical models of ecosystems have not yet been based upon independent observations of balanced material fluxes. Here we analyse two Antarctic ecosystems for which the interaction strengths are obtained: (1) directly, from independently measured material fluxes, (2) for the complete ecosystem and (3) with a close match between species and ‘trophic groups’. We analyse the role of recycling, predation and competition and find that ecosystem stability can be estimated by the strengths of the shortest positive and negative predator-prey feedbacks in the network. We show the generality of our explanation with another 21 observed food webs, comparing random-type parameterisations of interaction strengths with empirical ones. Our results show how functional relationships dominate over average-network topology. They make clear that the classic complexity-instability paradox is essentially an artificial interaction-strength result.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/ele.12266
Programmes: BAS Programmes > Polar Science for Planet Earth (2009 - ) > Ecosystems
BAS Programmes > Polar Science for Planet Earth (2009 - ) > Environmental Change and Evolution
ISSN: 1461023X
Additional Keywords: biodiversity, communities, complexity, ecological networks, ecosystems, feedbacks, food webs, interaction strength, omnivory, stability
Date made live: 19 Mar 2014 10:14 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/506398

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