Tidally Induced Temporal Variations in Growth of Young-of-the-Year Pacific Cod in the Yellow Sea
Tidally Induced Temporal Variations in Growth of Young-of-the-Year Pacific Cod in the Yellow Sea
复制标题
潮汐引起的黄海幼年太平洋鳕鱼生长的时间变化
DOI：
10.1029/2020jc016696
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发表时间：
2021
影响因子：
3.6
通讯作者：
Dong Xiuqiang
中科院分区：
文献类型：
--
作者：
Li Jianchao;Jiang Feng;Wu Rui;Zhang Chi;Tian Yongjun;Sun Peng;Yu Haiqing;Liu Yang;Ye Zhenjiang;Ma Shuyang;Liu Shude;Dong Xiuqiang
黄海是太平洋鳕鱼（Gadus microcephalus）分布的南部界限，黄海冷水团（YSCWM）为该物种提供了合适的过夏栖息地。潮流是黄海水动力系统的主要组成部分，其周期性变化影响着黄海的生态条件和相关生态系统，特别是在夏季呈分层状态的黄海南部海域。为了研究潮流对太平洋鳕鱼生长的影响，2017年分析了黄海太平洋鳕鱼幼鱼（YOY）耳石日增量。使用多场景时间延迟分析将这些数据与模拟潮流相结合。这表明：结果表明：（1）耳石的日生长量具有类似于半周潮汐变化的强信号;（2）由潮流变化引起的耳石最大生长量与每月大潮之间存在约0.8d的滞后;（3）鳕鱼迁入长江口后，特别是在定居阶段，潮流对耳石日生长的影响更大。鉴于越夏期间的分层海洋结构，在每两周一次的大潮期间加强潮汐混合将改善YSCWM内营养物质和氧气的交换，并导致耳石生长因摄食/消化和随后的生长而延迟响应。因此，潮流的变化对YOY太平洋鳕鱼的生长，并最终对YSCWM生态系统有显着的积极的生态效应。
The Yellow Sea is the southern limit of the distribution of Pacific cod (Gadus microcephalus), and the Yellow Sea Cold Water Mass (YSCWM) provides an appropriate over‐summering habitat for this species. Tidal current is the major component of the Yellow Sea hydrodynamic system, and its periodic variations influence the local ecological conditions and related ecosystems, particularly in the YSCWM, which is stratified in summer. To investigate the influence of tidal currents on Pacific cod growth, otolith daily increment in young‐of‐the‐year (YOY) Pacific cod in the Yellow Sea was analyzed in 2017. These data were integrated with a simulated tidal current using a multi‐scenario time‐delay analysis. This showed that: (1) the otolith daily increment exhibited a strong signal similar to the fortnightly tidal variation; (2) there was a lag of ∼8 days between the highest growth rate induced by the tidal current variation and monthly spring tide; and (3) the influence of the tidal current on otolith daily growth was stronger after migration of the cod into the YSCWM, particularly during the settlement stage. Given the stratified ocean structure during the over‐summering period, enhanced tidal mixing during the fortnightly spring tide would improve the exchange of nutrients and oxygen within the YSCWM, and lead to a delayed response of otolith growth due to feeding/digestion and subsequent growth. Therefore, variations in the tidal current have a marked positive ecological effect on the growth of YOY Pacific cod, and ultimately on the YSCWM ecosystem.