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首页> 外文期刊>Marine ecology progress series >Inter-annual climate variability affects foraging behavior and nutritional state of thick-billed murres breeding in the southeastern Bering Sea
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Inter-annual climate variability affects foraging behavior and nutritional state of thick-billed murres breeding in the southeastern Bering Sea

机译：年际气候变化影响白令海东南部厚嘴海繁殖的觅食行为和营养状况

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Warm oceanographic conditions of the continental shelf regions in the southeastern Bering Sea are associated with drastic increases in the abundance of juvenile walleye pollock Gadus chalcogrammus at shallow depths. We hypothesized that thick-billed murres Uria lomvia would benefit from these warm conditions by taking advantage of such an abundant prey resource available near their breeding colonies. We compiled a large dataset on the foraging behavior and nutritional state of murres breeding on St. George Island between 2003 and 2015. Murres foraged mostly on the continental shelf in warm years, but foraged in both on-shelf and off-shelf habitats in cold years. Shifts in foraging locations were associated with changes in diving depths. Nighttime foraging and daily diving effort increased during cold years, suggesting murres had to work more to obtain food under cold compared to warm conditions. Chick diets shifted from squid and benthic fishes in cold years to juvenile pollock in warm years. Foraging trip duration and reproductive success of birds were not affected by shifting oceanographic conditions, suggesting that murres behaviorally mediated the effects of inter-annual climate variability on their reproduction. However, this a??behavioral bufferinga?? had associated costs, reflected in higher corticosterone concentrations in the blood of murres in cold compared to warm years, indicating that breeding birds incurred higher levels of nutritional stress under cold conditions. Our multiyear integrative study provides support that warmer conditions on the continental shelf might benefit piscivorous seabirds due to an increase in the availability of juvenile walleye pollock in the southeastern Bering Sea.
机译：白令海东南部大陆架区域的温暖海洋条件与浅层幼体角膜白斑鳕加德斯蓝藻的大量增加有关。我们假设，通过利用在它们繁殖地附近可获得的如此丰富的猎物资源，厚嘴海乌拉尔邦将受益于这些温暖的条件。我们针对2003年至2015年间在圣乔治岛上繁殖的Murre的觅食行为和营养状况，编制了一个大型数据集。Murres在温暖的年份主要在大陆架觅食，但在寒冷的陆上和陆上栖息地均觅食。年份。觅食地点的变化与潜水深度的变化有关。在寒冷的天气里，夜间觅食和每日潜水的努力增加了，这表明与温暖的条件相比，在寒冷的条件下，为了获得食物，人们不得不更加努力。在寒冷的年份，小鸡的饮食从鱿鱼和底栖鱼类转变为温暖的年份的幼鳕。觅食行程的持续时间和鸟类的繁殖成功不受海洋条件变化的影响，这表明黑猩猩在行为上介导了年际气候变化对其繁殖的影响。但是，这是“行为缓冲”？具有相关的成本，这反映在寒冷季节与寒冷年份相比，鼠的血液中皮质酮浓度更高，这表明繁殖鸟类在寒冷条件下会产生更高水平的营养压力。我们多年的综合研究提供了支持，即由于白令海东南部幼稚角膜白鳕的可利用性增加，大陆架上较温暖的条件可能会使食鱼性海鸟受益。

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