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学科主题: Marine & Freshwater Biology; Oceanography
题名: Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open ocean
作者: Calbet, A ; Landry, MR
刊名: LIMNOLOGY AND OCEANOGRAPHY
发表日期: 1999-01-01
卷: 44, 期:6, 页:1370-1380
部门归属: Univ Hawaii Manoa, Dept Oceanog, Honolulu, HI 96822 USA
英文摘要: The phytoplankton in warm oligotrophic regions of the open oceans is dominated by <2-mu m cells too small for efficient direct consumption by mesozooplankton. However, these primary producers are hypothetically linked to higher trophic levels via the cascading impacts of mesozooplankton grazing on intermediate consumers. To assess the magnitudes of these indirect trophic linkages, grazing experiments, involving different concentration treatments of the mixed mesozooplankton community, were performed during cruises in the subtropical North Pacific at station ALOHA. Mesozooplankton fed on a diverse assemblage of microzooplankton and nanoheterotrophs >5 mu m, and their predation indirectly enhanced net growth rates of phytoplankton and 2-5-mu m heterotrophs. Increasing the concentration of mesozooplankton also enhanced growth rates of heterotrophic bacteria, but this was more likely the result of organic enrichment than trophic transfer. Scaled to their natural abundance, the indirect grazing impacts of mesozooplankton on lower trophic levels are small, accounting for <0.005 d(-1) of the growth rates of each prey category examined. Thus, the larger consumers appear to exert little net influence on the dynamics at the base of the food web. Ln contrast, size-fraction manipulations of consumers between 2 and 20 mu m (i.e., the nanozooplankton) elicited strong responses among bacterial populations indicative of tightly coupled predatory chain of at least two steps. Given the present results, detailed studies of the interactions among pico- and nanoplankton appear to be the most profitable avenue for improving our understanding of community structure and function in this region and for acquiring useful data for developing and validating ecosystem models of the open oceans.
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/344004/9316
Appears in Collections:海洋微食物网高被引文献_期刊论文

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Recommended Citation:
Calbet, A; Landry, MR.Mesozooplankton influences on the microbial food web: Direct and indirect trophic interactions in the oligotrophic open ocean,LIMNOLOGY AND OCEANOGRAPHY,1999,44(6):1370-1380
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