On the consequences of the interdependence of stabilizing and equalizing mechanisms
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705347.pdf
Description
Published version
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1.8 MB
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Adobe PDF
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Author(s)
Song, Chuliang
Barabás, György
Saavedra Sanchez, Serguei
Date Issued
September 2019
Journal
American Naturalist
Publisher
University of Chicago Press
Citation
Song, Chuliang et al., "On the Consequences of the Interdependence of Stabilizing and Equalizing Mechanisms." American Naturalist 194, 5 (November 2019): 627-39 doi. 10.1086/705347 ©2019 Authors
Version
Final published version
Abstract
We present an overlooked but important property of modern coexistence theory (MCT), along with two key new results and their consequences. The overlooked property is that stabilizing mechanisms (increasing species’ niche differences) and equalizing mechanisms (re-ducing species’ fitness differences) have two distinct sets of meanings within MCT: one in a two-species context and another in a general multispecies context. We demonstrate that the two-species framework is not a special case of the multispecies one, and therefore these two parallel frameworks must be studied independently. Our first result is that, using the two-species framework and mechanistic consumer-resource models, stabilizing and equalizing mechanisms exhibit complex interdependence, such that changing one will simultaneously change the other. Furthermore, the nature and direction of this simultaneous change sensitively depend on model parameters. The second result states that while MCT is often seen as bridging niche and neutral modes of coexistence by building a niche-neutrality continuum, the interdependence between stabilizing and equalizing mechanisms acts to break this continuum under almost any biologically relevant circumstance. We conclude that the complex entanglement of stabilizing and equalizing terms makes their impact on coexistence difficult to understand, but by seeing them as aggregated effects (rather than underlying causes) of coexistence, we may increase our understanding of ecological dynamics. ©2019 by The University of Chicago. All rights reserved.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
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DOI of Published Version
https://doi.org/10.1086/705347
