Seabird diving behaviour reveals the functional significance of shelf-sea fronts as foraging hotspots.
Seabird diving behaviour reveals the functional significance of shelf-sea fronts as foraging hotspots.
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DOI：
10.1098/rsos.160317
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发表时间：
2016-09
影响因子：
3.5
通讯作者：
Votier SC
中科院分区：
文献类型：
--
作者：
Cox SL;Miller PI;Embling CB;Scales KL;Bicknell AW;Hosegood PJ;Morgan G;Ingram SN;Votier SC
海洋前沿是各种海洋捕食者的主要栖息地，但它们如何影响精细尺度的觅食行为却知之甚少。在这里，我们调查了潜水行为的北方塘鹅桑在陆架海锋。我们GPS（全球定位系统）跟踪53种繁殖鸟类，并研究1901觅食潜水（从时间深度记录仪）和热锋（通过地球观测复合前映射确定）在凯尔特海，东北大西洋之间的关系。我们（一）使用的栖息地使用的可用性分析，以确定是否塘鹅优先在前线潜水，及（二）比较潜水特点，前线调查这些海洋功能的重要性。我们发现，塘鹅潜水概率和前线之间的关系各不相同的前线度量和性别。虽然在季节性持续锋面的存在下，两性都更有可能潜水，但与更短暂的特征的联系却不太清楚。在这里，男性与距离前线和跨前线梯度强度呈正相关，与女性相反。两种性别的潜水策略：浅V形跳水很少或没有积极的游泳阶段（92%的潜水）和更深的U形潜水，积极的追求阶段至少3秒（8%的潜水）。 当在前线觅食时，塘鹅进行U形潜水的可能性是V形潜水的一半，与性别无关。此外，V形俯冲持续时间显着缩短锋附近。这些行为反应支持了锋面是海洋掠食者重要觅食栖息地的说法，并表明两者在潜水行为方面可能存在机械联系。这项研究还强调了在试图了解海洋生态系统时跨学科研究的重要性。
Oceanic fronts are key habitats for a diverse range of marine predators, yet how they influence fine-scale foraging behaviour is poorly understood. Here, we investigated the dive behaviour of northern gannets Morus bassanus in relation to shelf-sea fronts. We GPS (global positioning system) tracked 53 breeding birds and examined the relationship between 1901 foraging dives (from time-depth recorders) and thermal fronts (identified via Earth Observation composite front mapping) in the Celtic Sea, Northeast Atlantic. We (i) used a habitat-use availability analysis to determine whether gannets preferentially dived at fronts, and (ii) compared dive characteristics in relation to fronts to investigate the functional significance of these oceanographic features. We found that relationships between gannet dive probabilities and fronts varied by frontal metric and sex. While both sexes were more likely to dive in the presence of seasonally persistent fronts, links to more ephemeral features were less clear. Here, males were positively correlated with distance to front and cross-front gradient strength, with the reverse for females. Both sexes performed two dive strategies: shallow V-shaped plunge dives with little or no active swim phase (92% of dives) and deeper U-shaped dives with an active pursuit phase of at least 3 s (8% of dives). When foraging around fronts, gannets were half as likely to engage in U-shaped dives compared with V-shaped dives, independent of sex. Moreover, V-shaped dive durations were significantly shortened around fronts. These behavioural responses support the assertion that fronts are important foraging habitats for marine predators, and suggest a possible mechanistic link between the two in terms of dive behaviour. This research also emphasizes the importance of cross-disciplinary research when attempting to understand marine ecosystems.
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影响因子：
2.8
作者：
Amelineau, Francoise;Peron, Clara;Gremillet, David
通讯作者：
Gremillet, David
影响因子：
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Embling, Clare B.;Illian, Janine;Scott, Beth E.
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Scott, Beth E.
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Aarts, Geert;MacKenzie, Monique;Matthiopoulos, Jason
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Hill, AE
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2.8
作者：
Bost, C. A.;Cotte, C.;Weimerskirch, H.
通讯作者：
Weimerskirch, H.