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Phylogenetic distance does not predict competition in green algal communities

H. Naughton,Markos A. Alexandrou,Todd H. Oakley,B. Cardinale

Published 2015 in Ecosphere

ABSTRACT

Biologists have held the tenet that closely related species compete more strongly with each other than with distant relatives since 1859, when Darwin observed that close relatives seldom co-occur in nature and suggested it was because they competitively exclude one another. The expectation that close relatives experience greater competition than distant relatives has become known as the “competition-relatedness hypothesis (CRH).” The CRH is predicated on the assumption that closely related species are more likely to have similar resource requirements than distant relatives, and thus, compete more strongly for limited resources. While this assumption has been popular because it is intuitive, it has also been subject to relatively little experimentation. Over the past decade, a growing number of CRH studies have arrived at divergent conclusions showing that the strength of competitive interactions can increase, decrease, or be independent of evolutionary relatedness. Most of these studies have focused on me...

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