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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Cross-shelf distribution of decapod larvae in a coastal upwelling zone of northern Chile: some oceanographic implications
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Cross-shelf distribution of decapod larvae in a coastal upwelling zone of northern Chile: some oceanographic implications

机译：智利沿海上升区脱像幼虫的跨货架分布：一些海洋学意义

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The northern of Chile is one of the most productive and permanent upwelling systems of the large Humboldt Current System. However, do not investigations have been developed about the decapod larvae dynamics in this region, characterized by its narrow continental shelf and an oxygen minimal zone (OMZ) very shallow (< 50 m). Four oceanographic campaigns carried out in a coastal upwelling zone off northern Chile in 2003 were used to analyze the dispersal patterns of 15 taxa from decapods larvae selected. The coastal upwelling conditions showed a maximum Ekman transport value (Mx) in January and a minimum in May, while the temperature and salinity characteristics defined four types of waters named a) cold upwelling waters (UW), b) warm trapped waters (WTW), c) upwelling front waters (UFW) and d) oceanic front waters (OFW), which showed different concentrations of dissolved oxygen, OMZ depth (< 1 mL L-1) and chlorophyll-a concentrations, respectively. Decapod larvae with the highest abundance and frequency were Cancer spp., Ementa analoga, Pinnaxodes chilensis, Callianassidea sp., Pagurus sp. and Allopenrolisthes sp., from adults of diverse habitats, characterized by different development stages and periods. The offshore weighted distance (d) estimated for the decapod larvae allowed the differentiation of three main groups. a) group formed by high dispersion larvae ( > 111cm), with five zoea stages and associated to the UFW waters, b) group formed by mean dispersion larvae (between 5 and 8 km) and distributed in upwelling waters (UW), and c) group showing lower horizontal dispersions (< 4 km), which significantly and negatively correlated to the OMZ in UW and WTW-type waters. The different cross-shelf distribution patterns relative to the oceanographic conditions were compared with other upwelling system, and larval behavior, morphology, environmental requirements and development period of different decapods were discussed.
机译：智利北部是大型Humboldt当前系统的最富有成效和永久的上升系统之一。然而，没有关于该区域的甲板幼虫动力学的研究，其特征在于其窄的大陆架和氧气最小区（OMZ）非常浅（<50米）。 2003年北部北部沿海上升区开展的四个海洋竞选活动用于分析来自甲板幼虫的15个分类群的分散模式。沿海上升情况的条件在1月份显示了最大的Ekman运输价值（MX），5月最低限度，而温度和盐度特征定义了四种类型的水域，名为A）冷藏水域（UW），B）温暖陷阱水域（WTW） C）升高的前水分（UFW）和D）海洋前水（OFW），其分别显示出不同浓度的溶解氧，OMZ深度（<1mL L-1）和叶绿素 - 一种浓度。具有最高丰度和频率的甲板幼虫是癌症SPP。，牡蛎胰岛素，Pinnaxode胰岛，Callianassidea Sp。，Pagurus sp。和Allopenrolisthes sp。，来自不同栖息地的成年人，以不同的发展阶段和时期为特征。估计为甲板幼虫估计的离岸加权距离（D）允许分化三个主要群体。 a）由高分散幼虫（> 111厘米）形成的组，其中五个Zoea阶段和与UFW水，B）组，B）由平均分散幼虫（5至8km）形成并分布在升上的水域（UW）和C. ）显示较低水平分散体（<4km）的组，其显着且与UW和WTW型水中的OMZ负相关。将不同的跨货架分布模式与海洋疾病相对于其他升值系统进行比较，并讨论了不同褥疮的幼虫行为，形态，环境要求和发展期。

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