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学科主题: Environmental Sciences & Ecology; Marine & Freshwater Biology; Oceanography
题名: Organism life cycles, predation, and the structure of marine pelagic ecosystems
作者: Verity, PG ; Smetacek, V
关键词: morphology ; life history ; plankton ; pelagic ; top-down ; trophic cascade ; predation ; ecosystem structure ; bottom-up
刊名: MARINE ECOLOGY-PROGRESS SERIES
发表日期: 1996-01-01
卷: 130, 期:1-3, 页:277-293
部门归属: ALFRED WEGENER INST POLAR & MARINE RES, D-27570 BREMERHAVEN, GERMANY
英文摘要: This paper explores the notion that the theoretical basis for contemporary research concerning the structure and function of marine pelagic ecosystems is self-limiting. While some findings such as the microbial food web have extended our knowledge of the biological components of the upper water column and their relationships to fluxes of materials and energy, they have not advanced our understanding of why specific pelagic forms occur in time and space, and why only some attain dominant status and contribute the bulk of biogenic fluxes emanating from the mixed layer. It is argued here that a major impediment to improved conceptual models is the historic focus on resource-driven or 'bottom-up' factors as being the dominant variables structuring planktonic ecosystems. Evidence is presented that predation or 'top-down' trophic effects may be equally important in specifying the occurrence of particular taxa, the biomass within adjacent trophic levels, and the morphology of dominant herbivores and carnivores. It is suggested that key species, because of unique combinations of life history strategies, metabolic demands, and physiological performance, may exert a dominant role in the extent to which predatory interactions cascade through pelagic food webs. There is considerable evidence of evolution of predation avoidance strategies among phytoplankton and zooplankton. It is proposed that future research might profitably be directed toward the question of how the pelagic environment selects for life histories and morphologies of organisms under conditions when resource availability and predation are both significant structural buttresses. Methodological approaches should include detailed studies of dominant key taxa from different environments, with the goal of identifying the critical aspects of life history, behavior, or morphology which account for their success.
语种: 英语
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/9276
Appears in Collections:海洋微食物网高被引文献_期刊论文

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Verity, PG; Smetacek, V.Organism life cycles, predation, and the structure of marine pelagic ecosystems,MARINE ECOLOGY-PROGRESS SERIES,1996,130(1-3):277-293
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文件名: Organism life cycles, predation, and the structure of marine pelagic ecosystems.pdf
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