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首页> 外文期刊>ICES Journal of Marine Science >Feeding by grey seals on endangered stocks of Atlantic cod and white hake
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Feeding by grey seals on endangered stocks of Atlantic cod and white hake

机译：用灰海豹喂养濒临灭绝的大西洋鳕鱼和白鳕鱼

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摘要

High natural mortality is preventing the recovery of collapsed stocks of Atlantic cod and white hake in the southern Gulf of St Lawrence, Canada. Predation by grey seals has been proposed as an important cause of this high mortality. We determined the contribution of cod and hake to the diet of grey seals collected along the west coast of Cape Breton Island and in the Cabot Strait, an area where overwintering cod aggregate. Along the coast of Cape Breton Island, the contribution of hake and cod to the diet was 30 and 17%, respectively, by weight using stomach contents and 13 and 9%, respectively, based on intestine contents. In the Cabot Strait, when overwintering aggregations of cod were present, cod accounted for 68% (range 57-80%) of the male diet from stomachs, and 46% (range: 31 -64%) of the diet determined from intestines. Among females, cod represented 14% (range: 0 - 34%) and 9% (range: 3 - 54%) of the diet from stomachs and intestines, respectively. In Cabot Strait, white hake accounted for up to 17% of the diet by weight from stomachs, and up to 6% of the diet determined from intestines. The mean length of cod consumed by seals was 28 cm (SD = 8.6) along the coast of Cape Breton Island, and 39 cm(SD = 5.7) in Cabot Strait. The mean length of hake consumed by seals was 29 cm(SD = 7.0) along the coast of Cape Breton Island, and 35 cm (SD = 5.6) in Cabot Strait. Cod and hake are more important to the diet of males than that of females. The contribution of cod to the diet of grey seals foraging in the cod overwintering area is much greater than has been reported elsewhere.
机译：高自然死亡率阻碍了加拿大圣劳伦斯湾南部大西洋鳕鱼和白鳕濒临灭绝的种群的恢复。有人提出用灰海豹捕食是造成这种高死亡率的重要原因。我们确定了鳕鱼和鳕鱼对布雷顿角岛西海岸和卡博特海峡（鳕鱼越冬地区）收集的灰海豹饮食的贡献。沿着布雷顿角岛海岸，鳕鱼和鳕鱼对饮食的贡献分别为30％和17％（以胃重量计），分别为13％和9％（以肠含量计）。在卡伯特海峡，当鳕鱼越冬时，鳕鱼占从胃中摄取的男性饮食的68％（范围为57-80％），而从肠中摄取的则占46％（范围：31 -64％）。在女性中，鳕鱼分别占胃和肠饮食的14％（范围：0-34％）和9％（范围：3-54％）。在卡博特海峡，白鳕鱼占胃饮食的17％（重量），占肠内饮食的6％。在布雷顿角岛沿岸，海豹消耗的鳕鱼平均长度为28厘米（标准差= 8.6），而在卡伯特海峡中则为39厘米（标准差= 5.7）。布雷顿角岛沿岸海豹消耗的无须鳕的平均长度为29厘米（标准差= 7.0），卡博特海峡沿岸的平均无须鳕消耗的长度为35厘米（标准差= 5.6）。鳕鱼和无须鳕对男性的饮食比对女性的饮食更为重要。鳕鱼对鳕鱼越冬地区灰海豹觅食的贡献比其他地方报道的要大得多。

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  • 来源
    《ICES Journal of Marine Science》 |2014年第6期|1332-1341|共10页
  • 作者

    M.O. Hammill; G.B. Stenson; D.P. Swain; H.P. Benoit;

  • 作者单位

    Department of Fisheries and Oceans, Maurice Lamontagne Institute, PO Box 1000, Mont-Joli, QC, Canada G5H 3Z4;

    Department of Fisheries and Oceans, Northwest Atlantic Fisheries Centre, PO Box 5667, St John's, NL, Canada A1C 5X1;

    Fisheries and Oceans Canada, Gulf Fisheries Centre, PO Box 5030, Moncton, NB, Canada E1C 9B6;

    Fisheries and Oceans Canada, Gulf Fisheries Centre, PO Box 5030, Moncton, NB, Canada E1C 9B6;

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  • 正文语种 eng
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  • 关键词

    Atlantic cod; diet; gadoid; grey seal; predation; white hake;

    机译：大西洋鳕鱼;饮食;胆小灰色印章;掠夺白无须鳕;

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