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首页> 外文期刊>Marine biology >Feeding ecology of the common dolphin {Delphinus delphis) in Western Iberian waters: has the decline in sardine (Sardina pilchardus) affected dolphin diet?
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Feeding ecology of the common dolphin {Delphinus delphis) in Western Iberian waters: has the decline in sardine (Sardina pilchardus) affected dolphin diet?

机译：伊比利亚西部水域常见海豚（Delphinus delphis）的喂养生态：沙丁鱼（Sardina pilchardus）的减少是否影响了海豚的饮食？

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摘要

Predator diet is expected to respond to changes in the abundance of important prey items. We investigated whether common dolphin diet has changed with changes in the pelagic fish community off the Iberian Peninsula in recent years, in particular with reference to the decline of sardine (Sardina pilchardus) and the increase of Atlantic chub mackerel (Scomber colias) and scads (Trachurus spp.), and estimated how much fish was removed by common dolphins in coastal waters of mainland Portugal. Based on analysis of stomach contents of stranded animals from 2010 to 2013 (n = 150), we related diet composition to sardine abundance, dolphin size and sex, season and region. Despite the decline in sardine stocks in recent years, sardines were the most important prey of common dolphins, as was previously reported in the 1990s, followed by chub mackerel and scads. However, small sardines have disappeared from the diet, consistent with recent poor recruitment to the stock. The relative importance of these pelagic species in the diet increased significantly with increasing dolphin length. The dietary importance of chub mackerel also varied regionally, with higher intake on the southern coast. Finally, we compared the estimated biomass of fish removed by dolphins with that taken by fisheries. We found that even with the severe quota restrictions on sardine catches, total biomass removed by fisheries was over five times greater than the estimated removal by common dolphins. Our results confirm the previously reported preference for energy-rich prey, especially sardine, suggesting that common dolphins in Portuguese waters specialise in feeding on this species.
机译：捕食者的饮食有望对大量重要猎物的变化做出反应。我们调查了近几年普通海豚的饮食是否随着伊比利亚半岛远洋鱼类群落的变化而发生了变化，特别是参考了沙丁鱼（Sardina pilchardus）的减少以及大西洋chu鱼（Scomber colias）和的增加（ Trachurus spp。），并估计葡萄牙海豚在葡萄牙大陆的沿海水域去除了多少鱼。根据2010年至2013年（n = 150）的滞留动物的胃内容分析，我们将饮食组成与沙丁鱼丰度，海豚大小和性别，季节和地区相关。尽管近年来沙丁鱼种群减少，但沙丁鱼是普通海豚最重要的猎物，正如先前在1990年代报道的那样，其次是chu鱼和鲭鱼。但是，小沙丁鱼已经从饮食中消失了，这与最近库存补充不足有关。这些海豚物种在日粮中的相对重要性随着海豚长度的增加而显着增加。鱼的饮食重要性也因地区而异，南部沿海地区的摄入量较高。最后，我们比较了海豚和渔业捕捞的估计生物量。我们发现，即使对沙丁鱼捕捞实行严格的配额限制，渔业捕捞的总生物量仍比普通海豚捕捞的估计生物量高出五倍以上。我们的结果证实了先前报道的对能量丰富的猎物（特别是沙丁鱼）的偏好，这表明葡萄牙水域的普通海豚专门捕食该物种。

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  • 来源
    《Marine biology》 |2018年第3期|44.1-44.16|共16页
  • 作者

    Marcalo Ana; Nicolau Lidia; Gimenez Joan; Ferreira Marisa; Santos Jorge; Araujo Helder; Silva Alexandra; Vingada Jose; Pierce Graham J.;

  • 作者单位

    Univ Aveiro, Ctr Environm & Marine Studies CESAM, Campus Univ Santiago, P-3810193 Aveiro, Portugal;

    Univ Aveiro, Ctr Environm & Marine Studies CESAM, Campus Univ Santiago, P-3810193 Aveiro, Portugal;

    CSIC, EBD, Dept Biol Conservac, Amer Vespucio S-N Isla Cartuja, Seville 41092, Spain;

    Univ Minho, SPVS, CBMA, Dept Biol, Campus Gualtar, P-4710057 Braga, Portugal;

    Univ Aveiro, Ctr Environm & Marine Studies CESAM, Campus Univ Santiago, P-3810193 Aveiro, Portugal;

    Univ Aveiro, Ctr Environm & Marine Studies CESAM, Campus Univ Santiago, P-3810193 Aveiro, Portugal;

    Portuguese Inst Sea & Atmosphere, IPMA, Ave Brasilia, Lisbon, Portugal;

    Univ Aveiro, Ctr Environm & Marine Studies CESAM, Campus Univ Santiago, P-3810193 Aveiro, Portugal;

    Univ Aveiro, Ctr Environm & Marine Studies CESAM, Campus Univ Santiago, P-3810193 Aveiro, Portugal;

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