While the long-distance movements of pelagic vertebrates are becoming known thanks to satellite telemetry, the factors determining their courses have hardly been investigated. We have analysed the effects of oceanographic factors on the post-nesting movements of three satellite-tracked leatherback turtles (Dermochelys coriacea) moving in the southwest Indian Ocean. By superimposing the turtle tracks on contemporaneous images of sea-surface temperatures and sea height anomalies, we show that currentrelated features dominate the shape of the reconstructed routes. After an initial offshore movement, turtles moved along straight routes when in the core of the current, or executed loops within eddies. Large parts of the routes were strikingly similar to those of surface drifters tracked in the same region. These findings document that long-lasting oceanic movements of marine turtles may be shaped by oceanic currents.

译文

:尽管借助卫星遥测技术已经了解了远洋脊椎动物的远距离运动,但几乎没有研究确定其航向的因素。我们已经分析了海洋因素对在印度洋西南部移动的三只追踪卫星的棱皮海龟(Dermochelys coriacea)筑巢后运动的影响。通过将海龟轨迹叠加在海面温度和海高异常的同期图像上,我们证明了与当前相关的特征主导着重建路线的形状。在最初的海上运动之后,海龟在当前的核心时沿着笔直的路线移动,或者在涡流中执行循环。这条路线的大部分与在同一地区追踪的地面漂流者极为相似。这些发现证明,海龟的持久海洋运动可能受到洋流的影响。

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