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Article
Trade-Offs and Coexistence in Fluctuating Environments: Evidence for a Key Dispersal-Fecundity Trade-Off in Five Nonpollinating Fig Wasps
The American Naturalist
  • A. Bradley Duthie, Iowa State University
  • Karen C. Abbott, Case Western Reserve University
  • John D. Nason, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
7-1-2015
DOI
10.1086/681621
Abstract

The ecological principle of competitive exclusion states that species competing for identical resources cannot coexist, but this principle is paradoxical because ecologically similar competitors are regularly observed. Coexistence is possible under some conditions if a fluctuating environment changes the competitive dominance of species. This change in competitive dominance implies the existence of trade-offs underlying species' competitive abilities in different environments. Theory shows that fluctuating distance between resource patches can facilitate coexistence in ephemeral patch competitors, given a functional trade-off between species dispersal ability and fecundity. We find evidence supporting this trade-off in a guild of five ecologically similar nonpollinating fig wasps and subsequently predict local among-patch species densities. We also introduce a novel colonization index to estimate relative dispersal ability among ephemeral patch competitors. We suggest that a dispersal ability-fecundity trade-off and spatiotemporally fluctuating resource availability commonly co-occur to drive population dynamics and facilitate coexistence in ephemeral patch communities.

Comments

This article is from The American Naturalist 186 (2015): 151, doi:10.1086/681621. Posted with permission.

Copyright Owner
The University of Chicago
Language
en
Date Available
07/01/2016
File Format
application/pdf
Citation Information
A. Bradley Duthie, Karen C. Abbott and John D. Nason. "Trade-Offs and Coexistence in Fluctuating Environments: Evidence for a Key Dispersal-Fecundity Trade-Off in Five Nonpollinating Fig Wasps" The American Naturalist Vol. 186 Iss. 1 (2015) p. 151 - 158
Available at: http://works.bepress.com/jason_nason/5/