文献类型： 外文期刊

作者： Zhou, Can ¹ ; Fujiwara, Masami ¹ ; Grant, William E. ¹ ;

作者机构： 1.Texas A&M Univ, Dept Wildlife & Fisheries Sci, College Stn, TX 77840 USA

2.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China

关键词： Co-integration tests;Species interactions;Time series analysis;Top down and bottom up;Unit root process

期刊名称：ENVIRONMENTAL AND ECOLOGICAL STATISTICS （ 影响因子：1.119； 五年影响因子：1.304 ）

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收录情况： SCI

摘要： The structure of ecological communities is often thought to be strongly influenced by population interactions. The interactions are often labeled as bottom-up and top-down control. Previous approaches to identify these processes often assume each population in the community is itself regulated. Therefore, each time series follows a stationary process. However, complex community structure and a lack of regulation in an individual population can result in inappropriate inferences based on traditional statistical approaches. Here, we introduce a statistical framework to analyze potentially non-stationary time series that are collectively regulated. We demonstrate the method with catch-per-unit-effort time series data of selected populations in the Gulf of Mexico. In the Gulf, we found that most of the time series data, which span 26 years, were non-stationary, thus individually unregulated. Species interaction patterns were location-dependent, but where brown shrimp interacted significantly with other species, we identified significant bottom-up forcing. On the other hand, we find almost no evidence of top-down forcing throughout the study areas.