Trophic Coherence Determines Food-web Stability

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2014 Dec 4

PMID 25468963

Citations 43

Authors

Samuel Johnson

Virginia Dominguez-Garcia

Luca Donetti

Miguel A Munoz

Affiliations

Soon will be listed here.

Abstract

Why are large, complex ecosystems stable? Both theory and simulations of current models predict the onset of instability with growing size and complexity, so for decades it has been conjectured that ecosystems must have some unidentified structural property exempting them from this outcome. We show that trophic coherence--a hitherto ignored feature of food webs that current structural models fail to reproduce--is a better statistical predictor of linear stability than size or complexity. Furthermore, we prove that a maximally coherent network with constant interaction strengths will always be linearly stable. We also propose a simple model that, by correctly capturing the trophic coherence of food webs, accurately reproduces their stability and other basic structural features. Most remarkably, our model shows that stability can increase with size and complexity. This suggests a key to May's paradox, and a range of opportunities and concerns for biodiversity conservation.

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