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首页> 外文期刊>ICES Journal of Marine Science >Community structured production of zooplankton in the eastern boundary upwelling system off central/southern Chile (2003-2012)
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Community structured production of zooplankton in the eastern boundary upwelling system off central/southern Chile (2003-2012)

机译:智利中部/南部附近东部边界上升系统中浮游动物的社区结构化生产(2003-2012年)

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摘要

Eastern boundary upwelling systems (EBUS) are highly productive and climatically sensitive ecosystems of the ocean. A critical component sustaining EBUS is the zooplankton secondary production (ZSP) which links primary production (PP) and the higher trophic levels. However, estimating ZSP is a complex task and many questions remain regarding its controlling factors. Here, we used automated analysis to assess taxonomic-structured biomass of zooplankton from a time series (2003-2012) at a fixed station off central-southern Chile. Zooplankton biomasses combined with empirically estimated growth rates, as a function of temperature, Chorophyll-a concentration, and body size, were used to estimate seasonal and interannual changes in ZSP. The annual integrated ZSP yielded a mean of 8.0g Cm-2 y(-1), with a minimum in 2009 of 5.7g Cm-2 y(-1) and a maximum in 2011 of 13g Cm-2 y(-1), and an average annual P/B ratio of 35. The transfer efficiency from PP to ZSP was only 0.8%, indicating a surplus of PP to the system and/or the importance of intermediate microzooplankton levels. Seasonal variation in biomass, ZSP and the P/B ratio were explained mostly by changes in taxonomic structure while interannual variation reflected large-scale climatic changes, such as the Pacific decadal oscillation.
机译:东部边界上升系统(EBUS)是海洋中高产且对气候敏感的生态系统。维持EBUS的关键要素是浮游动物的次级生产(ZSP),将初级生产(PP)和较高的营养水平联系起来。但是,估计ZSP是一项复杂的任务,关于其控制因素还有许多问题。在这里,我们使用自动化分析从智利中南部某个固定站点的时间序列(2003-2012年)评估浮游动物的分类结构生物量。浮游动物的生物量与根据温度,叶绿素a浓度和体重的函数根据经验估算的增长率相结合,可用来估算ZSP的季节和年际变化。年度综合ZSP的平均产量为8.0g Cm-2 y(-1),2009年最低为5.7g Cm-2 y(-1),2011年最高为13g Cm-2 y(-1) ,年平均P / B比率为35。从PP到ZSP的转移效率仅为0.8%,表明PP对系统的过剩和/或中间微浮游生物水平的重要性。生物量,ZSP和P / B比的季节性变化主要通过分类结构的变化来解释,而年际变化则反映了大规模的气候变化,例如太平洋年代际振荡。

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