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Vertical distribution of Eucalanoid copepods within the Costa Rica Dome area of the Eastern Tropical Pacific

机译:东部热带太平洋哥斯达黎加穹顶区域内桉类co足类动物的垂直分布

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摘要

A variety of ecological strategies for tolerance of low-oxygen conditions within the Costa Rica Dome (CRD) area of the Eastern Tropical Pacific are documented for the copepod family Eucalanidae. During the summer of 2010, we compared the ecological strategies used by the Eucalanidae inside and outside the central CRD region. We compared the vertical and horizontal distributions of five species, Eucalanus inermis, Subeucalanus subtenuis, Subeucalanus subcrassus, Subeucalanus pileatus and Pareucalanus attenuatus together with Rhincalanus species, in the epipelagic (upper 200 m) among four locations, which we grouped into a section roughly crossing the core CRD area (inside–outside core CRD). The coastal area outside the CRD supported the most diverse assemblage, whereas overall abundance of Eucalanidae in the central CRD was 2-fold greater than outside and dominated by E. inermis (>60%). Eucalanidae in the central CRD had a shallow depth distribution, closely associated with the shallow thermocline (10–20 m). There was no evidence of daily vertical migration in the central CRD, but E. inermis demonstrated vertical migration outside the CRD. The vertical abundance patterns of Eucalanidae in the CRD region reflect complex interactions between subtle physical–chemical differences and food resources.
机译:pe足类Eucalanidae有多种生态策略可耐受东部热带太平洋哥斯达黎加巨蛋(CRD)地区的低氧条件。在2010年夏季,我们比较了CRD中部地区内部和外部的桉科使用的生态策略。我们比较了上皮层(上200 m)中四个位置的上层上皮(上部200 m)中的5种物种无花桉,无花果亚皮虾,近生亚花蟹,subeucalanus subcrassus,Subeucalanus Pileatus和Pareucalanus pleusus物种的垂直和水平分布。核心CRD区域(核心CRD内外)。 CRD外部的沿海地区支持了最多样化的组合,而CRD中央的桉树科植物的总体丰度是外部的2倍,且以无核大肠杆菌为主导(> 60%)。中央CRD中的桉科具有较浅的深度分布,与较浅的跃层(10–20 m)密切相关。没有证据表明中央CRD每天都有垂直迁移,但是无定形大肠杆菌显示出CRD以外的垂直迁移。 CRD地区桉树科植物的垂直丰度模式反映了微妙的理化差异与食物资源之间的复杂相互作用。

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