Individual study: Low recovery of native forest vegetation after short-term cattle exclusion on Isla Robinsón Crusoe, Juan FernÃ¡ndez archipelago, Chile
Cuevas J.G. & Le Quesne C. (2006) Low vegetation recovery after short-term cattle exclusion on Robinson Crusoe Island. Plant Ecology, 18, 105-124
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Other biodiversity: Exclude grazers
A replicated, controlled study in 2000–2002 in pastures and forests on Robinson Crusoe Island, Chile, found seasonal variation in the number of species found in ungrazed plots, but not in grazed plots. Species diversity did not vary in ungrazed plots, but did in cattle-grazed plots. The cover of two of 22 species of plants varied over the course of the experiment. Plants: There was seasonal variation in the number of species found in ungrazed plots, but not grazed plots (5–8 vs 4–7 species). Diversity did not vary over time in ungrazed plots, but did in grazed plots (data reported as Shannon-Weaver-Weiner values). The cover of two of 22 species of plants varied over the experiment: Acaena argentea did not vary in cover over time in ungrazed plots, but did in grazed plots (found in 69–85% vs 51–69% of points); Conium maculatum showed variation in cover over time in ungrazed plots, but it was not found in grazed plots (found in 2–28% of points). Plant height varied over time only in ungrazed plots (22–78 vs 22–29 cm). Methods: In 2000, six 25 m2 plots were established: three in grazed pastures and three inside a cattle-exclusion fence in grazed pastures. These were then compared to six more plots in the grazed areas (three 13 m from the fence, three 44 m from the fence). Plants were monitored every three months at 121 points within each plot.