Fish and zooplankton interaction in the Central Baltic Sea
Fish and zooplankton interaction in the Central Baltic Sea
复制标题
波罗的海中部鱼类和浮游动物的相互作用
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. Dippner
中科院分区：
文献类型：
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作者：
G. Kornilovs;L. Sidrevics;J. Dippner
自1980年代初以来，波罗的海的远洋生态系统发生了很大变化。鳕鱼作为波罗的海中部的顶级捕食者，其种群规模在1990年代已大幅下降，处于非常低的水平，其结果是鳕鱼为主的系统已转变为鲱鱼为主的系统。有人指出，波罗的海的浮游动物群落也发生了变化，这一现象主要是由于水文环境的变化。拉脱维亚渔业研究所自1960年以来收集的长期浮游动物数据使人们得以分析浮游动物的主要捕食者-中上层鱼类对浮游动物生物量、种群结构和垂直迁移的年际变化的影响。采用多元回归模型，研究了春季长拟哲水蚤（Pseudocalanuselongatus）和夏季枝角类（Cladocera）的生物量与春季总种群生物量之间的关系，结果表明，春季长拟哲水蚤的生物量与春季枝角类生物量之间存在显著的线性相关关系，夏季枝角类生物量与春季枝角类生物量之间存在显著的线性相关关系，春季长拟哲水蚤的生物量与枝角类生物量之间存在显著的线性和长角泰莫拉（Temora longicornis），是沙鼠的主要食物。枝角类在秋季的快速消失可能是由于捕食造成的。2001年国际海洋考察理事会
The pelagic ecosystem of the Baltic Sea has considerably changed since the beginning of the 1980s. The stock size of cod as the top predator in the Central Baltic Sea has significantly decreased and is at a very low level in the 1990s, with the result that a cod-dominated system has changed to a clupeid(sprat)-dominated system. It has been stated that the zooplankton community has also changed in the Baltic Sea and that this phenomenon is mainly explained by changes in the hydrological environment. The long-term zooplankton data collected since 1960 by the Latvian Fisheries Research Institute allowed analyses of the influence of pelagic fishes, the main predators of the zooplankton, on interannual variability of biomass, stock structure and vertical migration of zooplankton. Using a multivariate regression model, two statistically significant and biologically plausible relationships between total stock biomass of sprat and biomass of Pseudocalanus elongatus in spring and biomass of Cladocera in summer were found. Linear correlation analyses indicate that increasing sprat stock size and strong year classes significantly influence the stock structure and vertical migration of Acartia spp. and Temora longicornis, the main food items of sprat. The fast disappearance of Cladocera in autumn could be caused by predation. 2001 International Council for the Exploration of the Sea