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首页> 外文期刊>Polar biology >The trophodynamics of Southern Ocean Electrona (Myctophidae) in the Scotia Sea
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The trophodynamics of Southern Ocean Electrona (Myctophidae) in the Scotia Sea

机译：斯科舍海南部海洋电子（Myctophidae）的对流动力学

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摘要

The Scotia Sea is one of the most productive regions of the Southern Ocean, but its surface waters are experiencing a rapid increase in temperature, which may be changing the behaviour and distribution of many myc-tophids and their prey species. Electrona antarctica and Electrona carlsbergi are two of the most abundant myc-tophids in the region, but their ecology is poorly understood and their response to ongoing environmental change is difficult to determine. This study investigated spatial and temporal patterns in their abundance, population structure and diets using mid-water trawl nets deployed across the Scotia Sea during spring, summer and autumn. E. antarctica was the most numerically abundant species (0.09-0.21 ind. 1,000 m~(-3)), with greatest concentrations occurring in the sea-ice sectors. E. carlsbergi occurred in more northern regions, comprising densities of 0.02-0.11 ind. 1,000 m~(-3). There was evidence of seasonal variation in depth distribution, size-related sexual dimorphism and size-specific vertical stratification for both species. Latitudinal trends in sex ratio and female body size were apparent for E. antarctica. Its diet varied between regions, seasons and size classes, but overall, Euphausia superba, Metridia spp. and Themisto gaudichaudii were the dominant prey items. E. carlsbergi appeared not to recruit in the Scotia Sea. Its diet was dominated by copepods, particularly Rhincalanus gigas and Metridia spp., but regional, seasonal and onto-genetic variations were evident. This study contributes to our understanding of how mid-water food webs are structured in the Southern Ocean and their sensitivity to ongoing environmental change.
机译：斯科舍海是南部海洋生产力最高的地区之一，但其地表水温度却在迅速升高，这可能改变了许多霉菌及其猎物的行为和分布。南极洲电单胞菌和卡尔斯伯格电热带菌是该地区最丰富的真菌病之一，但对它们的生态学知之甚少，并且它们对持续不断的环境变化的反应难以确定。这项研究使用春季，夏季和秋季跨斯科舍海部署的中间水拖网调查了它们的丰度，人口结构和饮食的时空格局。南极大肠杆菌是数量最多的物种（0.09-0.21 ind。1,000 m〜（-3）），浓度最高的是海冰部门。嘉士伯大肠杆菌发生在更北部的地区，密度为0.02-0.11 ind。 1,000 m〜（-3）。有证据表明，这两个物种的深度分布，与尺寸有关的性二态性和与尺寸有关的垂直分层都有季节性变化。南极大肠杆菌的性别比和女性体型的纬度趋势是显而易见的。它的饮食因地区，季节和大小等级而异，但总体来说是Euphausia superba，Metridia spp。和Themisto gaudichaudii是主要的猎物。 E. carlsbergi似乎不在斯科舍海招募。它的饮食以co足类动物为主，尤其是大花Rhincalanus gigas和Metridia spp。，但是区域，季节和个体发育方面的变化是明显的。这项研究有助于我们了解南部海洋中水食物网的结构及其对持续的环境变化的敏感性。

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  • 来源
    《Polar biology》 |2014年第6期|789-807|共19页
  • 作者

    Ryan A. Saunders; Martin A. Collins; Emma Foster; Rachel Shreeve; Gabriele Stowasser; Peter Ward; Geraint A. Tarling;

  • 作者单位

    British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK;

    Government of South Georgia and South Sandwich Islands, Government House, Stanley, Falkland Islands;

    British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK;

    British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK;

    British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK;

    British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK;

    British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK;

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  • 正文语种 eng
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  • 关键词

    Myctophidae; Electrona; Feeding ecology; Antarctic krill; Copepod; Scotia Sea;

    机译：Myctophidae;Electrona;饲养生态;南极磷虾;pe足类;斯科舍海;

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