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Science 30 November 2001:
Vol. 294. no. 5548, p. 1785
DOI: 10.1126/science.294.5548.1785i
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Fragmentation of a natural habitat has been shown to create a community-level trophic cascade caused by the absence of predators. Terborgh et al. (p. 1923; see the Perspective by Diamond) show that for fragments of tropical forest created by the Guri dam project in central Venezuela, predator populations become unsustainable. Herbivores then become hyperabundant and severely suppress the recruitment of canopy trees, presaging wholesale degradation of the vegetation and loss of species diversity.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)