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Increasing antagonistic interactions cause bacterial communities to collapse at high diversity
Author(s) -
Becker Joachim,
Eisenhauer Nico,
Scheu Stefan,
Jousset Alexandre
Publication year - 2012
Publication title -
ecology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.852
H-Index - 265
eISSN - 1461-0248
pISSN - 1461-023X
DOI - 10.1111/j.1461-0248.2012.01759.x
Subject(s) - biodiversity , biology , ecology , ecosystem , competition (biology) , community , ecosystem services , species richness , community structure
Ecology Letters (2012) 15 : 468–474 Abstract Biodiversity is a major determinant of ecosystem functioning. Species‐rich communities often use resources more efficiently thereby improving community performance. However, high competition within diverse communities may also reduce community functioning. We manipulated the genotypic diversity of Pseudomonas fluorescens communities, a plant mutualistic species inhibiting pathogens. We measured antagonistic interactions in vitro, and related these interactions to bacterial community productivity (root colonisation) and ecosystem service (host plant protection). Antagonistic interactions increased disproportionally with species richness. Mutual poisoning between competitors lead to a ‘negative complementarity effect’, causing a decrease in bacterial density by up to 98% in diverse communities and a complete loss of plant protection. The results emphasize that antagonistic interactions may determine community functioning and cause negative biodiversity–ecosystem functioning relationships. Interference competition may thus be an additional key for predicting the dynamics and performance of natural assemblages and needs to be implemented in future biodiversity models.