Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13993 |
Climate-mediated changes in marine ecosystem regulation during El Nino | |
Lindegren, Martin1; Checkley, David M., Jr.2; Koslow, Julian A.2; Goericke, Ralf2; Ohman, Mark D.2 | |
2018-02-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2018 |
卷号 | 24期号:2页码:796-809 |
文章类型 | Article |
语种 | 英语 |
国家 | Denmark; USA |
英文摘要 | The degree to which ecosystems are regulated through bottom-up, top-down, or direct physical processes represents a long-standing issue in ecology, with important consequences for resource management and conservation. In marine ecosystems, the role of bottom-up and top-down forcing has been shown to vary over spatio-temporal scales, often linked to highly variable and heterogeneously distributed environmental conditions. Ecosystem dynamics in the Northeast Pacific have been suggested to be predominately bottom-up regulated. However, it remains unknown to what extent top-down regulation occurs, or whether the relative importance of bottom-up and top-down forcing may shift in response to climate change. In this study, we investigate the effects and relative importance of bottom-up, top-down, and physical forcing during changing climate conditions on ecosystem regulation in the Southern California Current System (SCCS) using a generalized food web model. This statistical approach is based on nonlinear threshold models and a long-term data set (similar to 60years) covering multiple trophic levels from phytoplankton to predatory fish. We found bottom-up control to be the primary mode of ecosystem regulation. However, our results also demonstrate an alternative mode of regulation represented by interacting bottom-up and top-down forcing, analogous to wasp-waist dynamics, but occurring across multiple trophic levels and only during periods of reduced bottom-up forcing (i.e., weak upwelling, low nutrient concentrations, and primary production). The shifts in ecosystem regulation are caused by changes in ocean-atmosphere forcing and triggered by highly variable climate conditions associated with El Nino. Furthermore, we show that biota respond differently to major El Nino events during positive or negative phases of the Pacific Decadal Oscillation (PDO), as well as highlight potential concerns for marine and fisheries management by demonstrating increased sensitivity of pelagic fish to exploitation during El Nino. |
英文关键词 | bottom-up climate ecosystem regulation El Nino food web model management Pacific Decadal Oscillation top-down |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423994700049 |
WOS关键词 | CALIFORNIA CURRENT SYSTEM ; OSCILLATING CONTROL HYPOTHESIS ; SOUTHERN CALIFORNIA ; BOTTOM-UP ; FOOD WEBS ; TOP-DOWN ; TROPHIC CASCADES ; PACIFIC HAKE ; MERLUCCIUS-PRODUCTUS ; NORTHERN ANCHOVY |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17491 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Tech Univ Denmark, Natl Inst Aquat Resources, Ctr Ocean Life, Lyngby, Denmark; 2.Univ Calif San Diego, Scripps Inst Oceanog, San Diego, CA 92103 USA |
推荐引用方式 GB/T 7714 | Lindegren, Martin,Checkley, David M., Jr.,Koslow, Julian A.,et al. Climate-mediated changes in marine ecosystem regulation during El Nino[J]. GLOBAL CHANGE BIOLOGY,2018,24(2):796-809. |
APA | Lindegren, Martin,Checkley, David M., Jr.,Koslow, Julian A.,Goericke, Ralf,&Ohman, Mark D..(2018).Climate-mediated changes in marine ecosystem regulation during El Nino.GLOBAL CHANGE BIOLOGY,24(2),796-809. |
MLA | Lindegren, Martin,et al."Climate-mediated changes in marine ecosystem regulation during El Nino".GLOBAL CHANGE BIOLOGY 24.2(2018):796-809. |
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