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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Foraging behavior of a high-Arctic zooplanktivorous alcid, the little auk, at the southern edge of its breeding range
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Foraging behavior of a high-Arctic zooplanktivorous alcid, the little auk, at the southern edge of its breeding range

机译：在其繁殖范围的南部边缘，一个高北极游动动物性小蜥蜴的觅食行为

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摘要

Zooplanktivorous seabirds as central-place foragers are constrained by the need to repeatedly return to the colony. Breeding within a cost-effective distance from food-abundant foraging grounds may be crucial for successful reproduction. In this study, foraging areas, ranges and habitats of high-Arctic little auks (Alle alle) breeding on Bjamoya in the Barents Sea, at the southern edge of their breeding range, were investigated combining GPS-tracking and satellite remote sensing. Birds were expected to forage in areas with productive oceanographic features (cold shelf and frontal zone waters) close to their breeding colony. Contrary to expectation, they foraged in warm waters (sea surface temperature median 6.6 degrees C), optimal for boreal zooplanlcton. Little auks preferred shallow shelf waters (mean depth 74 m) characterized by higher chlorophyll a concentrations. Parent birds performed both short (ST) and long (LT) foraging trips, both of considerably longer duration compared to other colonies in more high-Arctic environment. During ST they probably spent more time searching for preferred Arctic prey (dominating in chick diet samples) among abundant Atlantic zooplankton. Long duration of LT resulted from exploring distant cold waters abundant in Arctic zooplankton community. This confirms that little auks are able to respond to various environmental conditions through the plasticity of their foraging behavior without negative consequences for chick survival. To date, observed changes in marine environment have not posed a threat to the ability of little auks on Bjarnaya to feed their chicks energy-rich zooplanlcton. (C) 2015 Elsevier B.V. All rights reserved.
机译：浮游动物海鸟作为中心觅食者，需要反复返回该殖民地。在距食物丰富的觅食场经济有效的距离内进行育种对于成功繁殖至关重要。在这项研究中，结合GPS跟踪和卫星遥感技术，对在其繁殖范围南端的巴伦支海的Bjamoya上的高北极小auks（Alle alle）的觅食区域，范围和栖息地进行了调查。预计鸟类将在繁殖地附近具有丰富海洋学特征的地区（冷架子和额水域）觅食。与预期相反，它们在温暖的水域（海面温度中位数为6.6摄氏度）中觅食，最适合北方浮游动物。小金黄色鲨鱼更喜欢浅叶架水（平均深度为74 m），其特征在于叶绿素a浓度较高。亲鸟进行短时（ST）和长时（LT）觅食旅行，与北极更高环境中的其他殖民地相比，它们的持续时间都长得多。在ST期间，他们可能会花费更多时间在丰富的大西洋浮游动物中寻找偏爱的北极猎物（以雏鸡饮食样本为主）。由于探索北极浮游动物群落中丰富的遥远冷水而导致长期持续时间。这证实了很少的秋葵能够通过其觅食行为的可塑性来应对各种环境条件，而对雏鸡的存活没有负面影响。迄今为止，观察到的海洋环境变化尚未威胁到比尼亚纳（Bjarnaya）上的小金枪鱼喂食其能量丰富的浮游动物的能力。 （C）2015 Elsevier B.V.保留所有权利。

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