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Science 10 September 1999:
Vol. 285. no. 5434, pp. 1742 - 1744
DOI: 10.1126/science.285.5434.1742
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Reports

Fungal Endophyte Symbiosis and Plant Diversity in Successional Fields

Keith Clay, * Jenny Holah

Increasing evidence suggests that microbial interactions are important determinants of plant biodiversity. The hypothesis that fungal endophyte symbiosis reduces diversity in successional fields was tested by manipulating infection of tall fescue, the most abundant perennial grass in the eastern United States. Over a 4-year period, species richness declined and tall fescue dominance increased in infected plots relative to uninfected plots without differences in total productivity. A host-specific endophyte, with negligible biomass, altered plant community structure in this long-term field experiment and may be reducing plant diversity throughout its expanding range.

Department of Biology, Indiana University, Bloomington, IN 47405, USA.
*   To whom correspondence should be addressed: E-mail: clay{at}indiana.edu

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