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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Role of circulation scales and water mass distributions on larval fish habitats in the Eastern Tropical Pacific off Mexico
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Role of circulation scales and water mass distributions on larval fish habitats in the Eastern Tropical Pacific off Mexico

机译：墨西哥东部热带太平洋幼体鱼类栖息地的循环尺度和水量分布的作用

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摘要

On the basis of five oceanographic cruises carried out in the Eastern Tropical Pacific off Mexico, relationships between the larval fish habitats (areas inhabited by larval fish assemblages) and the environmental circulation scales (mesoscale, seasonal, and interannual) were examined. Analysis of in situ data over a grid of hydrographic stations and oblique zooplankton hauls with bongo net (505 mm) was combined with orthogonal robust functions decomposition applied to altimetry anomalies obtained from satellite. During both cool (March and June) and warm (August and November) periods, Bray-Curtis dissimilarity Index defined three recurrent larval fish habitats which varied in species composition and extent as a function of the environmental scales. The variability of the Tropical larval fish habitat (characterized by high species richness, and dominated by Vinciguerria lucetia, Diogenichthys laternatus, and Diaphus pacificus) was associated with the seasonal changes. The Transitional-California Current larval fish habitat (dominated by V. lucetia and D. laternatus, with lower mean abundance and lower species richness than in the Tropical habitat) and Coastal-and-Upwelling larval fish habitat (dominated by Bregmaceros bathymaster) was associated mainly with mesoscale activity induced by eddies and with coastal upwelling. During February 2010, the Tropical larval fish habitat predominated offshore and the Transitional-California Current larval fish habitat was not present, which we attribute to the effect of El Ni~no conditions. Thus, the mesoscale, seasonal, and interannual environmental scales affect the composition and extension of larval fish habitats.
机译：根据墨西哥东部热带太平洋地区进行的五次海洋航行，考察了幼鱼栖息地（由幼鱼组合居住的区域）与环境循环规模（中尺度，季节性和年际）之间的关系。结合邦戈网（505毫米）对水文站和斜线浮游动物拖网的网格上的原位数据进行分析，并将正交稳健函数分解应用于从卫星获得的测高异常。在凉爽（3月和6月）和温暖（8月和11月）期间，Bray-Curtis差异指数定义了三个复发性幼体鱼生境，其物种组成和程度随环境规模的变化而变化。热带幼虫鱼栖息地的变异性（以物种丰富度高为特征，并以长白垩病菌（Vinciguerria lucetia），Digenichthys Laternatus和Diaphus pacificus为主）。过渡性加利福尼亚州目前的幼虫鱼生境（由V. lucetia和D. Laternatus主导，平均丰度和物种丰富度均低于热带生境）和沿海及上升流幼虫鱼生境（由Bregmaceros bathymaster主导）主要是由涡旋引起的中尺度活动和沿海上升。在2010年2月，热带幼体鱼的栖息地在海上占主导地位，而过渡加州目前的幼体鱼的栖息地不存在，这归因于厄尔尼诺现象的影响。因此，中尺度，季节性和年际环境尺度影响幼鱼栖息地的组成和扩展。

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