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首页> 外文期刊>Regional Environmental Change >Facing extremes: Cory's shearwaters adjust their foraging behaviour differently in response to contrasting phases of North Atlantic Oscillation
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Facing extremes: Cory's shearwaters adjust their foraging behaviour differently in response to contrasting phases of North Atlantic Oscillation

机译：面向极端：Cory的Shearwaters以响应北大西洋振荡的对比阶段而不同地调整他们的觅食行为

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Climate projections predict increases in the frequency and severity of extreme climate events over the next decades. Hence, phases of extreme climatic indices are emerging as one of the most dangerous effects of climate change, though their impacts on wildlife populations are still poorly understood. Here, we studied the foraging behaviour, body condition and breeding performance of a neritic (Berlenga Island) and oceanic (Corvo Island) population of Cory's shearwaters (Calonectris borealis) in the mid-North Atlantic, during the two most positive and negative phases of North Atlantic Oscillation (NAO) reported in recent decades. We showed that during an extreme negative NAO phase, birds from Berlenga spent less time foraging and provided less food to their chicks, which subsequently grew more slowly and were in poorer body condition. In contrast, the opposite pattern was found during the strong positive NAO phase in this population. Interestingly, during the same extreme negative NAO phase, birds from Corvo were more successful in terms of their foraging and breeding performance, taking advantage of the enhanced productivity associated with the cyclonic eddies (negative sea surface height anomalies) which occurred close to the colony. However, when anticyclonic eddies (positive sea surface height anomalies) were prevalent near the colony during the strong positive NAO phase, birds travelled longer distances, which negatively impacted their own body condition and that of their chicks. Our study shows that populations breeding in neritic and oceanic areas of the eastern North Atlantic Ocean make contrasting foraging behavioural decisions in response to climate extremes and highlights the importance of mesoscale eddies for oceanic populations of pelagic seabirds.
机译：气候预测在未来几十年中预测极端气候事件的频率和严重程度的增加。因此，极端气候指数的阶段被涌现为气候变化最危险的影响之一，尽管它们对野生动物种群的影响仍然很清楚。在这里，我们在北部大西洋中北大西洋中核心牧羊犬（Callentis Borealis）的中间人（Berlenga岛）和海洋（Corvo Island）的觅食行为，身体状况和育种表现，在两个最积极和负面阶段北大西洋振荡（NAO）近几十年报道。我们表明，在极端负数的Nao阶段，来自伯朗加的鸟类花了更少的时间觅食，并为他们的小鸡提供了更少的食物，随后越来越慢，身体状况较差。相比之下，在该群体的强阳性Nao相期间发现相反的模式。有趣的是，在相同的极端负数Nao阶段，来自Corvo的鸟类在他们的觅食和繁殖性能方面更加成功，利用与周围涡斑（负海面高度异常）相关的增强的生产力，这发生了接近殖民地。然而，当在强烈的正态阶段殖民地附近的反气旋漩涡（正海表面高度异常）在殖民地附近普遍存在时，鸟类距离较长的距离，对自己的身体状况和小鸡的距离产生负面影响。我们的研究表明，东北大西洋中书呆子和海洋地区的种群繁殖，以应对气候极端的造成对比的行为决策，并突出了Messcale Eddies对海洋群体的脑海鸟类海鸟的重要性。

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