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作者 Gripne, Stephanie Lynn
書名 A cross-site study to determine the effects of different-sized herbivores on plant communities across a productivity gradient
國際標準書號 9780493076928
book jacket
說明 47 p
附註 Source: Masters Abstracts International, Volume: 39-03, page: 0774
Major Professor: Mark E. Ritchie
Thesis (M.S.)--Utah State University, 2000
Understanding the effects of herbivory on plant species diversity is an essential component of maintaining and restoring grassland ecosystems. I generated predictions for three related hypotheses for the effects of herbivore exclusion on plant species diversity across a productivity gradient. Three sets of herbivore exclosures were established at seven grassland sites. I measured plant species composition and aboveground production for three treatments: large herbivores excluded, both large and intermediate herbivores excluded, and a control. Large herbivore exclusion increased species richness at sites of intermediate productivity, while reducing richness at sites of high productivity. The patterns do not appear to support the proposed plant-herbivore hypotheses. Excluding herbivores for both treatments reduced evenness and diversity at almost every site. These strong effects of intermediate-sized herbivores suggest that they may be consuming the dominant plant species early in the season, controlling overall effects of herbivores on plant diversity more strongly than previously thought
School code: 0241
Host Item Masters Abstracts International 39-03
主題 Biology, Ecology
0329
Alt Author Utah State University
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