Foraging spots of streaked shearwaters in relation to ocean surface currents as identified using their drift movements
Foraging spots of streaked shearwaters in relation to ocean surface currents as identified using their drift movements
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DOI：
10.1016/j.pocean.2013.12.002
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发表时间：
2014-03
影响因子：
4.1
通讯作者：
K. Yoda;Kozue Shiomi;Katsufumi Sato
中科院分区：
文献类型：
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作者：
K. Yoda;Kozue Shiomi;Katsufumi Sato
洋流持续运动，对海洋生态系统产生强烈影响。海流的现场观测对于了解海洋动物如何对不同规模的海洋表层海流作出反应，以及实现有效的生态系统管理和建立现实的海洋学模型至关重要。我们开发了一种新的方法，通过使用海鸟作为类似于漂流浮标的拉格朗日电流传感器来获得现场电流测量。我们部署了高分辨率的全球定位系统（GPS）记录仪上条纹剪水（Calonectrisleucomelas）觅食在Oyashio-Tsugaru暖流汇合在日本，这是世界上最富有成效的海洋之一。海鸟反复进行觅食旅行，包括在数百公里的海面上寻找猎物和休息。海鸟有一半的时间在水面上休息，往往是被动的漂流者。推测C. leucomelas提供了关于海洋表面流的直接和详细的描述，因为从其漂移运动推断出的海流与从现场和卫星数据推断出的海洋表面流非常吻合。此外，我们还从GPS跟踪中提取了与觅食（即觅食点）相关的海鸥密集搜索飞行的细节。leucomelas没有觅食的反气旋漩涡的核心;相反，他们使用的边界地区之间的漩涡和漩涡的边缘，初级生产力和猎物密度被认为是高的。我们的研究表明，动物传播的GPS数据可以提供一个详细和具有成本效益的工具，用于观察海洋表面电流，并可以揭示海洋动物对这些电流的精细反应方式。
Ocean currents are in continuous motion and strongly influence oceanic ecosystems. In situ observation of currents is of primary importance for understanding how marine animals respond to ocean surface currents at various scales and for realizing effective ecosystem-based management and realistic oceanographic modelling. We developed a new method for obtaining in situ current measurements by using seabirds as Lagrangian current sensors akin to drifting buoys. We deployed high-resolution global positioning system (GPS) loggers on streaked shearwaters (Calonectrisleucomelas) foraging in the Oyashio-Tsugaru Warm Current confluence in Japan, which is one of the most productive oceans in the world. The seabirds repeatedly performed foraging trips, including searching for prey and resting on the sea surface, over several hundred kilometres. The seabirds spent half of their time resting on the water surface and tended to be passive drifters. We inferred that the drift movements ofC. leucomelasprovided a direct and detailed description of the ocean surface currents, because currents deduced from their drift movements were in good agreement with ocean surface currents derived from in situ and satellite data. In addition, we extracted details of shearwaters’ intense searching flights associated with feeding (i.e. foraging spots) from GPS tracks.C. leucomelasdid not forage at the core of anticyclonic eddies; rather, they used the boundary areas between eddies and the edge of eddies where primary productivity and prey density are thought to be high. Our study demonstrated that animal-borne GPS data can provide a detailed and cost-efficient tool for observing ocean surface currents and can reveal the ways in which marine animals respond to these currents at a fine scale.