Interactive effects of resource enrichment and resident diversity on invasion of native grassland by <Emphasis Type="Italic">Lolium arundinaceum</Emphasis> |
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Authors: | W Brett Mattingly Barbara L Swedo Heather L Reynolds |
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Institution: | (1) Department of Biology, Indiana University, Bloomington, IN 47405, USA |
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Abstract: | Resident diversity and resource enrichment are both recognized as potentially important determinants of community invasibility,
but the effects of these biotic and abiotic factors on invasions are often investigated separately, and little work has been
done to directly compare their relative effects or to examine their potential interactions. Here, we evaluate the individual
and interactive effects of resident diversity and resource enrichment on plant community resistance to invasion. We factorially
manipulated plant diversity and the enrichment of belowground (soil nitrogen) and aboveground (light) resources in low-fertility
grassland communities invaded by Lolium arundinaceum, the most abundant invasive grass in eastern North America. Soil nitrogen enrichment enhanced L. arundinaceum performance, but increased resident diversity dampened this effect of nitrogen enrichment. Increased light availability (via
clipping of aboveground vegetation) had a negligible effect on community invasibility. These results demonstrate that a community’s
susceptibility to invasion can be contingent upon the type of resource pulse and the diversity of resident species. In order
to assess the generality of these results, future studies that test the effects of resident diversity and resource enrichment
against a range of invasive species and in other environmental contexts (e.g., sites differing in soil fertility and light
regimes) are needed. Such studies may help to resolve conflicting interpretations of the diversity–invasibility relationship
and provide direction for management strategies. |
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