Immediate impact of the tsunami associated with the 2011 Great East Japan Earthquake on the Plecoglossus altivelis altivelis population from the Sanriku coast of northern Japan
Immediate impact of the tsunami associated with the 2011 Great East Japan Earthquake on the Plecoglossus altivelis altivelis population from the Sanriku coast of northern Japan
复制标题
2011 年东日本大地震引发的海啸对日本北部三陆海岸的鮨鮨种群的直接影响
DOI：
10.1007/s10641-016-0495-8
复制
发表时间：
2016
影响因子：
1.4
通讯作者：
Otake Tsuguo
中科院分区：
文献类型：
--
作者：
Hata Masayoshi;Kawakami Tatsuya;Otake Tsuguo
2011年东日本大地震引发的巨大海啸严重影响了日本三陆海岸的生态系统。为揭示海啸对香鱼的直接影响，采用耳石分析方法，对海啸后三陆沿岸两条河流中的香鱼（Plecoglossus altivelis altivelis）的生活史特征进行了研究。孵化日期组成不同的上游移民之间的海啸之前和之后。海啸后的洄游鱼仅由10月和11月孵化的鱼类组成，而海啸前的洄游鱼主要由9月孵化的鱼类组成。移民和漂流幼虫（孵化幼虫）的孵化日期之间的差异表明，早期孵化的鱼类在海啸期间发生了选择性死亡。海啸前后的上游移民之间的耳石Sr：Ca比值的差异表明，生存的海啸鱼类居住在盐水和早期孵化的鱼类居住在河口的数量减少，因为河口周围的严重侵蚀选择性。海洋生长期随孵化期的变化而缩短。这些结果表明，海啸极大地改变了P的生态。altivelis altivelis在三陆海岸。
The huge tsunami associated with the 2011 Great East Japan Earthquake severely impacted the ecosystems on the Sanriku coast of Japan. The life history traits of ayu,Plecoglossus altivelis altivelis, which have a one-year amphidromous life history, were investigated by otolith analyses in two rivers of the Sanriku coast just after the tsunami compared with results before the tsunami to reveal the immediate impact of the tsunami. Hatching date compositions differed between the upstream migrants before and after the tsunami. The migrants after the tsunami were solely composed of fish hatched during October and November, whereas the migrants before the tsunami were mostly composed of fish hatched in September. Discrepancies between the hatching dates of the migrants and drifting larvae (hatched larvae) indicate that selective mortality of early-hatched fish occurred during the tsunami. Differences in otolith Sr:Ca ratios between upstream migrants before and after the tsunami suggest that fish surviving the tsunami inhabited saline water and early-hatched fish that inhabited the estuary decreased selectively in number because of the severe erosion around the river mouth. The oceanic growth period shortened in accordance with the change in hatching date. These results show that the tsunami drastically altered the ecology ofP. altivelis altivelison the Sanriku coast.