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首页> 外文期刊>Marine ecology progress series >Dual-foraging of Cory's shearwaters in the Azores: feeding locations, behaviour at sea and implications for food provisioning of chicks
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Dual-foraging of Cory's shearwaters in the Azores: feeding locations, behaviour at sea and implications for food provisioning of chicks

机译：亚速尔群岛中Cory的剪水的双重觅食：觅食地点，海上行为以及对雏鸡食物供应的影响

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Many procellariiform (tube-nosed) seabirds employ a dual-foraging strategy involving repeated alternation of short and long foraging trips. For species breeding at sites around the Southern Ocean, long trips typically extend to areas of enhanced productivity at great distance from the nest. Evidence concerning the use of such areas during dual-foraging in other oceanographic regions is, however, limited. The present study examines the foraging strategy, locations and behaviour at sea of Cory's shearwaters in the Azores, a chain of 9 islands and associated islets in 3 groups straddling the mid-Atlantic ridge (MAR) in the North Atlantic Ocean. Adults used a dual-foraging strategy with an average of 3 short (1 to 4 d) trips followed by a long trip of up to 20 d (average 9 d). Short trips were evenly distributed around breeding sites within an average range of 75 km, whereas long trips without exception headed north of the Azores and extended up to 1800 km from the nest. Core foraging areas for long trips were within apparent regions of enhanced productivity resulting from cold water upwelling along the MAR north of the colony (for birds from the central Azores) or over the western flank of the MAR northwest of the colony (for birds from the western Azores). On long trips from all 3 island groups birds also visited an additional area of enhanced productivity in the region of Flemish Cap, close to the North American continental shelf edge. Birds commuted to and from distant foraging sites relatively quickly (25 km h~(-1) on average), but individual parents did not co-ordinate their foraging activity to reduce the frequency of nights when chicks were unfed. As a result, chicks experienced much longer intervals between feeds (up to 9 nights) than conspecifics at other North Atlantic islands in the absence of dual-foraging (maximum 4 nights). However, chicks in the Azores received much larger meals when they were fed, and so the overall food provisioning rate (g d~(-1)) was similar to that recorded elsewhere.
机译：许多procellariiform（管鼻）海鸟采用双重觅食策略，涉及短时和长时觅食行程的反复交替。对于在南大洋周围地点繁殖的物种，长途旅行通常会延伸到离巢很远的地方以提高生产力。但是，有关在其他海洋区域进行双重觅食期间使用这些区域的证据有限。本研究研究了北亚大西洋中脊（MAR）上的亚速尔群岛（Azores）科里（Cory）的切水在海上的觅食策略，位置和行为，该群岛由9个岛屿和3个相关岛组成的岛链。成虫采用双觅食策略，平均短途旅行3次（1至4 d），然后长途旅行长达20 d（平均9 d）。短途旅行平均分布在繁殖场周围，平均距离为75公里，而长途旅行无一例外地在亚速尔群岛以北，一直延伸到巢穴1800公里。长途旅行的核心觅食区位于明显提高生产力的区域内，这是由于沿殖民地北部MAR的冷水上升（对于来自亚速尔群岛中部的鸟类）或在殖民地西北部MAR的西翼上方（对于来自大西洋的鸟类）西亚速尔群岛）。在所有3个岛屿群的长途旅行中，鸟类还参观了佛兰芒海角地区附近北美大陆架边缘附近另一个生产力提高的地区。鸟类相对较快地往返于较远的觅食地点（平均25 km h〜（-1）），但是父母双方并没有协调其觅食活动以减少雏鸡不喂食的夜晚次数。结果，在没有双重觅食的情况下（最多4晚），小鸡两次喂食之间的间隔（最多9晚）比其他北大西洋岛屿上的同种异食更长。但是，亚速尔群岛的雏鸡进食时进食量要大得多，因此总体食物供给率（g d〜（-1））与其他地方记录的相似。

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