Mechanisms linking diversity, productivity and invasibility in experimental bacterial communities

被引:82
作者
Hodgson, DJ
Rainey, PB
Buckling, A
机构
[1] CEH Oxford, Ecol Grp, Oxford OX1 3SR, England
[2] Univ Oxford, Dept Plant Sci, Oxford OX1 3RB, England
[3] Univ Bath, Dept Biol & Biochem, Bath BA2 7AY, Avon, England
关键词
bacteria; diversity; ecosystem function; invisibility; microcosm; productivity;
D O I
10.1098/rspb.2002.2146
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Decreasing species diversity is thought to both reduce community productivity and increase invasibility to other species. However, it remains unclear whether identical mechanisms drive both diversity-productivity and diversity-invisibility relationships. We found a positive diversity-productivity relationship and negative diversity-invisibility and productivity-invisibility relationships using microcosm communities constructed from spatial niche specialist genotypes of the bacterium Pseudomonas fluorescens. The primary mechanism driving these relationships was a dominance (or selection) effect: more diverse communities were more likely to contain the most productive and least invasible type. Statistical elimination of the dominance effect greatly weakened the diversity-invisibility relationship and eliminated the diversity-productivity relationship, but also revealed the operation of additional mechanisms (niche complementarity, positive and negative interactions) for particular combinations of niche specialists. However, these mechanisms differed for invasibility and productivity responses, resulting in the invisibility-productivity relationship changing from strongly negative to weakly positive. In the absence of the dominance effect, which may be an experimental artefact, decreasing diversity can have unexpected or no effects on ecosystem properties.
引用
收藏
页码:2277 / 2283
页数:7
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