Positive interactions in ecology: filling the fundamental niche

Main Article Content

Mariano A. Rodriguez-Cabal
M. Noelia Barrios-Garcia
Martin A. Nuñez

Abstract

The role of negative interactions in shaping ecological communities and the realized niches of species has been a focus of considerable research for at least decades. Traditionally, the discrepancy between the size of the fundamental and realized niche of a species was attributed to the effect of negative interactions, such that the realized niche is always smaller than the fundamental niche. However, in the last decade, a series of studies have highlighted the important role that positive interactions played in shaping the structure of communities. This renewed interest in positive interactions has led to a reconsideration of the niche concept. Specifically, some investigators have suggested that positive interactions can lead the realized niche of a species to be larger than its fundamental niche. Here, we show that although positive interactions can counteract the effects of negative interactions and possibly modify the realized niche of a species, the realized niche of a species can never be larger than the fundamental niche.

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Commentary
Author Biographies

Mariano A. Rodriguez-Cabal, University of Tennessee

Department of Ecology and Evolutionary Biology

and Graduate Student

M. Noelia Barrios-Garcia, University of Tennessee

Department of Ecology and Evolutionary Biology

and Graduate Student

Martin A. Nuñez, University of Tennessee

Department of Ecology and Evolutionary Biology

and Postdoctoral Fellow