Mesoscale fronts as foraging habitats: composite front mapping reveals oceanographic drivers of habitat use for a pelagic seabird.
Mesoscale fronts as foraging habitats: composite front mapping reveals oceanographic drivers of habitat use for a pelagic seabird.
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中尺度锋面作为觅食栖息地：复合锋面测绘揭示了远洋海鸟栖息地利用的海洋学驱动因素。
DOI：
10.1098/rsif.2014.0679
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Scales KL
中科院分区：
文献类型：
--
作者：
Scales KL
海洋脊椎动物栖息地利用的海洋学驱动因素知之甚少，但却是我们了解海洋生态系统功能的基础。在这里，我们使用复合锋面测绘和高分辨率GPS跟踪来确定中尺度海洋锋面作为北方野生动物觅食栖息地选择的物理驱动因素的重要性。我们在两年多的时间里追踪了66只来自凯尔特海殖民地的繁殖鹅，并使用停留时间来识别区域限制搜索(ARS)的行为。复合锋面图在两个不同的时间尺度上识别出热锋和叶绿素-大气尺度锋面--(I)同期锋面和(Ii)季节性持续锋带。使用广义加性模型(GAMS)和广义估计方程(GEE-GAMS)来解释跟踪数据中的序列自相关，我们发现灵芝不会对同生锋面的行为做出调整。然而，ARS更有可能发生在空间上可预测的、季节性持续的额区(GAM)内。我们的结果为复合锋面图是研究海洋特征对动物运动影响的有用工具提供了概念证明。此外，我们强调，锋面持续性是形成海洋可移动脊椎动物的远洋觅食热点的关键因素。
The oceanographic drivers of marine vertebrate habitat use are poorly understood yet fundamental to our knowledge of marine ecosystem functioning. Here, we use composite front mapping and high-resolution GPS tracking to determine the significance of mesoscale oceanographic fronts as physical drivers of foraging habitat selection in northern gannetsMorus bassanus. We tracked 66 breeding gannets from a Celtic Sea colony over 2 years and used residence time to identify area-restricted search (ARS) behaviour. Composite front maps identified thermal and chlorophyll-amesoscale fronts at two different temporal scales—(i) contemporaneous fronts and (ii) seasonally persistent frontal zones. Using generalized additive models (GAMs), with generalized estimating equations (GEE-GAMs) to account for serial autocorrelation in tracking data, we found that gannets do not adjust their behaviour in response to contemporaneous fronts. However, ARS was more likely to occur within spatially predictable, seasonally persistent frontal zones (GAMs). Our results provide proof of concept that composite front mapping is a useful tool for studying the influence of oceanographic features on animal movements. Moreover, we highlight that frontal persistence is a crucial element of the formation of pelagic foraging hotspots for mobile marine vertebrates.