文章基本信息

标题：Interaction strength combinations and the overfishing of a marine food web
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作者：Jordi Bascompte ; Carlos J. Melián ; Enric Sala 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2005
卷号：102
期号：15
页码：5443-5447
DOI：10.1073/pnas.0501562102
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The stability of ecological communities largely depends on the strength of interactions between predators and their prey. Here we show that these interaction strengths are structured nonrandomly in a large Caribbean marine food web. Specifically, the cooccurrence of strong interactions on two consecutive levels of food chains occurs less frequently than expected by chance. Even when they occur, these strongly interacting chains are accompanied by strong omnivory more often than expected by chance. By using a food web model, we show that these interaction strength combinations reduce the likelihood of trophic cascades after the overfishing of top predators. However, fishing selectively removes predators that are overrepresented in strongly interacting chains. Hence, the potential for strong community-wide effects remains a threat.
关键词：community stability ; omnivory ; trophic chain ; trophic cascade ; quantitative networks