Long‐Term Variation in Mesozooplankton Biomass Caused by Top‐Down Effects: A Case Study in the Coastal Sea of Japan
Long‐Term Variation in Mesozooplankton Biomass Caused by Top‐Down Effects: A Case Study in the Coastal Sea of Japan
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DOI：
10.1029/2022gl099037
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发表时间：
2022-07
影响因子：
5.2
通讯作者：
T. Kodama;Y. Igeta;N. Iguchi
中科院分区：
文献类型：
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作者：
T. Kodama;Y. Igeta;N. Iguchi
中型浮游动物是鱼类补充和全球海洋地球化学循环的关键群体。北太平洋边缘海日本海沿海的四个十年期观测表明，基于湿重的中型浮游动物生物量受到环境诱导的自下而上和捕食诱导的自上而下过程的控制。使用广义线性模型方法的浮游动物生物量的年际变化表明，在20世纪80年代的生物量减少，随后在20世纪90年代初迅速增加，并在2010年逐渐减少。这些年际变化的镜像所看到的小型中上层食饵鱼类生物量。浮游动物生物量与前一年的差异与太平洋年代际振荡指数呈正相关，与鱼类生物量呈负相关。后者得到了格兰杰因果关系分析的支持。因此，自上而下的控制是海洋浮游动物生物量长期变化的主要原因之一。
Mesozooplankton is a key group for the recruitment of fish and global biogeochemical cycles. Four decadal observations in the coastal Sea of Japan, the marginal sea of the North Pacific, indicate that wet weight‐based mesozooplankton biomass is controlled by both environment‐induced bottom‐up and predatory‐induced top‐down processes. Interannual variations in mesozooplankton biomass using a generalized linear model approach showed a decrease in biomass during the 1980s, followed by a rapid increase in the early 1990s, and a gradual decrease in the 2010s. These interannual variations were the mirror image of those seen small pelagic planktivorous fish biomass. The difference in zooplankton biomass from the previous year was positively correlated with that of the Pacific decadal oscillation index and negatively with that of fish biomass. The latter was supported by a Granger causality analysis. Therefore, top‐down control is one of the main causes of long‐term variations of zooplankton biomass in the ocean.