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首页> 外文期刊>ICES Journal of Marine Science >Contrasting coastal and shelf nursery habitats of Pacific cod in the southeastern Bering Sea
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Contrasting coastal and shelf nursery habitats of Pacific cod in the southeastern Bering Sea

机译：白令海东南部太平洋鳕鱼的沿海和陆架苗圃生境的对比

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摘要

Shallow, subtidal waters of coastal embayments are the primary nursery habitats of juvenile Pacific cod through much of their range. However, the importance of these habitats to the Bering Sea population is poorly understood as the Bering Sea offers relatively little of this habitat. In this study, we examined the use of demersal and pelagic habitats in the southeast Bering Sea by age-0 Pacific cod. In 4 years of demersal beam trawling on the shelf at depths of 20-146 m, fish were most abundant along the Alaska Peninsula (AKP) at depths to 50 m. In addition, 1 year of spatially intensive beam trawl sampling was conducted at depths of 5-30 m in a nearshore focal area along the central AKP. In this survey, age-0 cod were more abundant along the open coastline than they were in two coastal embayments, counter to patterns observed in the Gulf of Alaska. Demersal sampling in 2012 was conducted synoptically with surveys of surface and subsurface waters over the continental shelf. Age-0 cod were captured in pelagic waters over the middle and outer shelf, with maximum catches occurring over depths of 60-80 m. The similar size distributions of fish in coastal-demersal and shelf-surface habitats and the proximity of concentrations in the two habitat types suggests that habitat use in the Bering Sea occurs along a gradient from coastal to pelagic. While capture efficiencies may differ among trawl types, trawl-based estimates of age-0 cod density in demersal waters along the AKP was 10 times that observed in the highest density pelagic-shelf habitats, demonstrating the importance of coastal nursery habitats in this population. Despite representing a much smaller habitat area, the coastal waters along the AKP appear an important nursery area and support a significant fraction of the age-0 Pacific cod in the Bering Sea.
机译：在大部分范围内，浅滩潮汐带是沿海太平洋鳕鱼的主要苗圃栖息地。然而，人们对这些栖息地对白令海人口的重要性知之甚少，因为白令海提供的栖息地相对较少。在这项研究中，我们研究了0岁太平洋鳕鱼在白令海东南部的海底和深海生境的利用。在20至146 m深度的架子上拖拉水下射线的4年中，沿阿拉斯加半岛（AKP）深度达50 m的鱼类数量最多。此外，在沿中央AKP的近岸焦点区域的5-30 m深度进行了为期一年的空间密集束拖网采样。在这项调查中，与开放的海岸线相比，在两个开放的海岸线上，年龄为0的鳕鱼更加丰富，这与在阿拉斯加湾观察到的模式相反。 2012年对海底取样与大陆架上的地表水和地下水进行了调查。 0岁鳕鱼被捕获在中层和外层架子的浮游水域中，最大捕获量发生在60-80 m的深度。沿海-底栖和架子-表面生境中鱼类的大小分布相似，并且两种生境类型中的浓度接近，这表明白令海生境的使用沿从沿海到中上层的梯度发生。尽管拖网类型的捕捞效率可能有所不同，但基于拖网的AKP沿岸水域0岁鳕鱼密度的估算值是密度最高的中上层架生境中观测值的10倍，证明了该地区沿海苗圃生境的重要性。尽管代表的栖息地面积要小得多，但AKP沿岸的水域还是重要的苗圃地区，在白令海中支撑着很大一部分零龄的太平洋鳕鱼。

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  • 来源
    《ICES Journal of Marine Science》 |2015年第2期|515-527|共13页
  • 作者

    Hurst Thomas P.; Cooper Daniel W.; Duffy-Anderson Janet T.; Farley Edward V.;

  • 作者单位

    NOAA, Fisheries Behav Ecol Program, Resource Assessment & Conservat Engn Div,Hatfield, Alaska Fisheries Sci Ctr,Natl Marine Fisheries Se, Newport, OR 97365 USA;

    NOAA, Recruitment Proc Program, Resource Assessment & Conservat Engn Div, Alaska Fisheries Sci Ctr,Natl Marine Fisheries Se, Seattle, WA 98115 USA;

    NOAA, Recruitment Proc Program, Resource Assessment & Conservat Engn Div, Alaska Fisheries Sci Ctr,Natl Marine Fisheries Se, Seattle, WA 98115 USA;

    NOAA, Auke Bay Labs, Alaska Fisheries Sci Ctr, Natl Marine Fisheries Serv, Juneau, AK 99801 USA;

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  • 正文语种 eng
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  • 关键词

    Bering Sea; habitat; juvenile; nursery; pacific cod Gadus macrocephalus;

    机译：白令海;栖息地;幼体;苗圃;太平洋鳕鱼Gadus macrocephalus;

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