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首页> 外文期刊>Marine biology >No way home: collapse in northern gannet survival rates point to critical marine ecosystem perturbation
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No way home: collapse in northern gannet survival rates point to critical marine ecosystem perturbation

机译：没路回家：北方鸬鹚生存率崩溃指向关键海洋生态系统扰动

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摘要

Seabirds are one of the most threatened of all bird groups, with a marked community-wide decline across the last decades. Yet, some seabird species are more resilient than others, and it is essential to study under which conditions even these highly resilient organisms are affected by global changes. Here, we report such a case in northern gannets (Morus bassanus). Using global location sensors (GLS), demographic and stable isotope analyses, we performed a long-term study of the migration biology and inter-annual survival of gannets breeding on Rouzic Island in Brittany, France. Across 2006-2015, our analyses showed that the birds spent the inter-breeding period off Western Europe, in the Mediterranean or off West Africa. There were no inter-annual trends in the use of these different areas, but isotopic analyses suggested food competition between gannets and industrial-scale fisheries. Crucially, we found a precipitous decline in the return rates of birds equipped with GLS, from 100% in 2006-2007 to less than 30% after 2015. This decline was consistent with a marked decrease in inter-annual survival probabilities for ringed adult gannets, from 90% in 2014-2015 to 60% in 2018-2019, and with a population decline of the Rouzic gannet breeding colony in recent years. Strong ecological signals provided by northern gannets point to critical marine ecosystem perturbation in the Eastern Atlantic, and the decline of this resilient and emblematic species should lead to the urgently needed transformation of marine policies.
机译：海鸟是所有鸟类最受威胁的人之一，在过去几十年中具有明显的社区衰落。然而，一些海鸟物种比其他人更具弹性，并且对于这些高度弹性的生物而言，必须研究的研究是必不可少的。在这里，我们在北方Gannets（Morus Bassanus）报告了这样的案例。使用全球定位传感器（GLS），人口统计和稳定的同位素分析，我们对法国布列塔尼的鲁西奇岛繁殖的迁移生物学和年度常规生存的长期研究。我们的分析表明，鸟类在地中海或西非的西欧营养时期。使用这些不同的区域没有年度阶段趋势，但同位素分析建议齿轮和工业规模渔业之间的食物竞争。至关重要的是，我们发现，在2015年的2006 - 2007年的鸟类的返回率下降了速度下降，从2006 - 2007年少于30％。这种下降符合年度成年齿轮的年度生存概率的显着降低，2014-2015的> 90％在2018 - 2019年的<60％，近年来鲁西奇·吉南繁殖殖民地的人口下降。北方GANNETES提供的强大的生态信号指向东部大西洋的关键海洋生态系统扰动，这种弹性和象征物种的衰落应导致迫切需要的海洋政策转型。

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  • 来源
    《Marine biology》 |2020年第12期|189.1-189.10|共10页
  • 作者

    Gremillet David; Peron Clara; Lescroel Amelie; Fort Jerome; Patrick Samantha C.; Besnard Aurelien; Provost Pascal;

  • 作者单位

    La Rochelle Univ Ctr Etud Biol Chize CEBC UMR 7372 CNRS Villiers En Bois France|Univ Cape Town Percy FitzPatrick Inst African Ornithol Rondebosch South Africa;

    Univ Antilles Univ Caen Normandie Sorbonne Univ CNRS IRD Lab Biol Organismes & Ecosyst Aquat BOREA Museum Paris France;

    Point Blue Conservat Sci Petaluma CA USA;

    La Rochelle Univ CNRS Littoral Environm & Soc LIENSs UMR 7266 La Rochelle France;

    Univ Liverpool Sch Environm Sci Liverpool Merseyside England;

    Univ Montpellier CEFE CNRS EPHE PSL Univ IRD Univ Paul Valery Montpellier 3 Montpellier France;

    Reserve Nat Natl Sept Iles Ligue Protect Oiseaux Pleumeur Bodou France;

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