El Nino episodes coincide with California moray Gymnothorax mordax settlement around Santa Catalina Island, California
El Nino episodes coincide with California moray Gymnothorax mordax settlement around Santa Catalina Island, California
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DOI：
10.1111/jfb.13253
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发表时间：
2017-04-01
影响因子：
2
通讯作者：
Mehta, R. S.
中科院分区：
文献类型：
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作者：
Higgins, B. A.;Pearson, D.;Mehta, R. S.
对厄尔尼诺事件影响加州裸胸鳝定居模式的假说进行了检验。浮游幼虫历期（PLD）的测定结果表明，浮游幼虫历期（PLD）与浮游幼虫历期（PLD）呈负相关关系。mordax是未知的，但对相关物种的leptocephalus的研究表明，幼虫寿命长，可达2年。裸胸是一种难以捉摸的掠食性物种，也是加州海岸附近唯一的Muraenid，被认为在卡塔利纳岛周围的沃茨有大量的裸胸。从卡塔利纳岛的两个港口采集了33只个体，并采集耳石以估计其年龄。每个人的定居年反算使用估计年龄从耳石测量。然后将这些年龄与美国国家海洋和大气管理局（NOAA）开发的海洋尼诺指数（ONI）进行交叉参考，以将估计的定居年龄与已知的厄尔尼诺年相关联。在收集到的33个个体中，有30个在厄尔尼诺年期间定居在卡塔利纳岛。数据集中年龄最大的个体是22岁，将G。在这个系统中，莫达克斯是一种寿命较长的食肉鱼类。本研究首次报道了野生G. mordax年龄，并建议厄尔尼诺事件有一个重要的作用，在推动解决新兵对北方边缘的范围。(C)2017年，不列颠群岛渔业协会。
The hypothesis that ElNino events influence the settlement patterns of the Californiamoray Gymnothorax mordax is tested. The pelagic larval duration (PLD) of larval G. mordax is unknown, but studies on leptocephalus of related species suggest that larvae are long-lived, up to 2 years. Gymnothorax mordax, an elusive predatory species and the onlymuraenid off the coast of California, is considered abundant in the waters around Catalina Island. Thirty-three individuals were collected from Two Harbors, Catalina Island, and otoliths were taken to provide estimates of their age. Settlement year for each individual was backcalculated using estimated age from otolith measurements. These ages were then cross referenced with the Oceanic Nino Index (ONI) developed by the National Oceanographic and Atmospheric Administration (NOAA) to correlate estimated age of settlement with known El Nino years. Of the 33 individuals collected, 30 settled at Catalina Island during El Nino years. The oldest individual in the data-set was 22 years old, placing G. mordax as one of the longer-lived predatory fishes in the system. The present study represents the first account of wild G. mordax ages and suggests that El Nino events have an important role in driving the settlement of recruits towards the northern edge of their range. (C) 2017 The Fisheries Society of the British Isles.