On Testing the Role of Niche Differences in Stabilizing Coexistence

Document Type

Article

Journal/Book Title/Conference

Functional Ecology

Volume

22

Issue

5

Publisher

Wiley-Blackwell

Publication Date

2008

First Page

934

Last Page

936

Abstract

Replacement series designs have been criticized because they may inaccurately predict the outcome of competition, particularly when species’ vital rates respond to competitor density in strongly nonlinear ways. Here we explain that despite this concern, experiments manipulating frequency can still effectively quantify the strength of niche differences in stabilizing coexistence, the goal of an experiment we proposed in an earlier paper. Niche differences cause species to have greater per capita growth rates when rare than when common, and we demonstrate that this result is robust to variation in total density. We also emphasize that our proposed experimental design does not call for fixing density across species’ frequency gradients, thus differing from a traditional replacement series design. We show that our approach and the more labor-intensive response surface design share the same theoretical foundation and both are apppropriate for quantifying the role of niche differences in stabilizing the dynamics of coexisting species.

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