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首页> 外文期刊>ICES Journal of Marine Science >Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord
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Seasonal dynamics of growth and mortality suggest contrasting population structure and ecology for cod, pollack, and saithe in a Norwegian fjord

机译：生长和死亡率的季节性动态表明，挪威峡湾鳕鱼，波拉克鱼和赛义德的种群结构和生态环境存在差异

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摘要

We study the dynamics of Atlantic cod (Gadus morhua L.), pollack (Pollachius pollachius L.), and saithe (Pollachius virens L.) in Masfjorden, a small fjord in western Norway. Annually, cohorts of pollack and cod grow in size and decline in abundance, as expected of closed populations, whereas saithe virtually disappear before maturity. Seasonally, in contrast, the dynamics of cod and pollack differ. Pollack shows a regular growth pattern, with most of the growth taking place in summer. Its abundance-at-age shows strong seasonal variations, with a marked increase from spring to summer followed by a decline through autumn and winter. These patterns relate partly to seasonal changes in depth distribution and catchability. Combined with the observation that spawning-stage pollack are abundant in spring, we interpret these patterns to suggest that pollack in Masfjorden represent a dynamically independent unit. Seasonal changes in abundance are less marked for cod, and seasonal changes in depth distribution seem insignificant. However, cod shows an unusual pattern in length at age, with no apparent growth in summer and fast growth in autumn. These patterns suggest that the population structure of cod may be more open than that of pollack and may involve mixing of more than one population component.
机译：我们在挪威西部的小峡湾Masfjorden研究大西洋鳕（Gadus morhua L.），波拉克（Pollachius pollachius L.）和saithe（Pollachius virens L.）的动力学。每年，如封闭人群所期望的，鳕鱼和鳕鱼的数量增加，而鱼的丰度下降，而赛义德在成熟之前实际上消失了。相比之下，在季节性上，鳕鱼和鳕鱼的动态不同。 Pollack显示出规律的增长方式，大部分增长发生在夏季。其丰富的年龄显示出强烈的季节变化，从春季到夏季明显增加，然后到秋季和冬季下降。这些模式部分与深度分布和可捕获性的季节性变化有关。结合春季产卵期产卵期丰富的观察结果，我们解释这些模式以表明马斯菲约登的产卵期动态独立。鳕鱼的丰度季节变化不那么明显，深度分布的季节变化似乎微不足道。然而，鳕鱼在年龄上表现出不同寻常的长度，在夏天没有明显的增长，而在秋天却快速增长。这些模式表明，鳕鱼的种群结构可能比鳕鱼的种群结构更为开放，并且可能涉及多种种群组成的混合。

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  • 来源
    《ICES Journal of Marine Science》 |2012年第4期|p.537-546|共10页
  • 作者

    Mikko Heino; Terje Svasand; Jarle Tryti Nordeide; Hakon Ottera;

  • 作者单位

    Department of Biology, University of Bergen, PO Box 7803, Bergen N-5020, Norway,Institute of Marine Research, PO Box 1870 Nordnes, Bergen N-5817, Norway,International Institute for Applied Systems Analysis, Schlossplatz 7, Laxenburg A-2361, Austria;

    Institute of Marine Research, PO Box 1870 Nordnes, Bergen N-5817, Norway;

    F'acuity of Biosciences and Aquaculture, University of Nordland, Bode N-8049, Norway;

    Institute of Marine Research, PO Box 1870 Nordnes, Bergen N-5817, Norway;

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  • 正文语种 eng
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  • 关键词

    gadidae; population ecology; seasonal dynamics; spatial population structure;

    机译：ad科人口生态学季节动态;空间人口结构;

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