Pan Xindong, Chen Yong, Jiang Tao, Yang Jian, Tian Yongjun
Deep Sea and Polar Fisheries Research Center and Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266003 China.
Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao, 266003 China.
Mar Life Sci Technol. 2024 Apr 30;6(4):722-735. doi: 10.1007/s42995-024-00229-x. eCollection 2024 Nov.
Climate change, particularly extreme climate events, is likely to alter the population connectivity in diverse taxa. While the population connectivity for highly migratory species is expected to be vulnerable to climate change, the complex migration patterns has made the measurement difficult and studies rare. However, otolith biogeochemistry provides the possibility to evaluate these climate-induced impacts. Japanese Spanish mackerel is a highly migratory fish that is widely distributed in the northwest Pacific. Otoliths biogeochemistry of age-1 spawning or spent individuals from three consecutive years (2016-2018), during which a very strong El Niño was experienced (2015-2016), were analyzed to evaluate the temporal variation of connectivity for population along the coast of China. The elemental concentrations of the whole otolith showed that Ba:Ca and Mg:Ca values were found to significantly increase in the El Niño year. The random forest classification and clustering analysis indicated a large-scale connectivity between East China Sea and the Yellow Sea in the El Niño year whereas the local assemblages in different spawning areas were more self-sustaining after the El Niño year. These findings lead to the hypothesis that environmental conditions associated with the El Niño Southern Oscillation (ENSO) events in the Northern Pacific Ocean would likely influence the population connectivity of . If so, extreme climate events can result in profound changes in the extent, pattern and connectivity of migratory fish populations. Our study demonstrates that otolith biogeochemistry could provide insight towards revealing how fish population response to extreme climate events.
The online version contains supplementary material available at 10.1007/s42995-024-00229-x.
气候变化，尤其是极端气候事件，可能会改变不同分类群的种群连通性。虽然高度洄游物种的种群连通性预计容易受到气候变化的影响，但复杂的洄游模式使得测量困难且相关研究较少。然而，耳石生物地球化学为评估这些气候诱发的影响提供了可能性。日本竹荚鱼是一种高度洄游的鱼类，广泛分布于西北太平洋。分析了连续三年（2016 - 2018年）1龄产卵或产后个体的耳石生物地球化学，在此期间经历了一次非常强烈的厄尔尼诺现象（2015 - 2016年），以评估中国沿海种群连通性的时间变化。整个耳石的元素浓度表明，在厄尔尼诺年，Ba:Ca和Mg:Ca值显著增加。随机森林分类和聚类分析表明，在厄尔尼诺年东海和黄海之间存在大规模连通性，而在厄尔尼诺年之后不同产卵区的局部群体更具自我维持性。这些发现引出了一个假设，即与北太平洋厄尔尼诺 - 南方涛动（ENSO）事件相关的环境条件可能会影响……的种群连通性。如果是这样，极端气候事件可能会导致洄游鱼类种群的范围、模式和连通性发生深刻变化。我们的研究表明，耳石生物地球化学可以为揭示鱼类种群对极端气候事件的反应提供见解。
在线版本包含可在10.1007/s42995 - 024 - 00229 - x获取的补充材料。
