Magnetic navigation behavior and the oceanic ecology of young loggerhead sea turtles
Magnetic navigation behavior and the oceanic ecology of young loggerhead sea turtles
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DOI：
10.1242/jeb.109975
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
N. Putman;P. Verley;Courtney S. Endres;K. Lohmann
中科院分区：
文献类型：
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作者：
N. Putman;P. Verley;Courtney S. Endres;K. Lohmann
摘要在长距离迁徙过程中，动物利用各种感官线索、机制和策略进行导航。虽然导航机制通常在受控的实验室条件下进行研究，但这种方法很少允许在环境背景下检查导航行为。同样，虽然现实的环境模型经常被用来调查动物运动的生态影响，明确考虑在这样的模型导航机制是罕见的。在这里，我们使用了一种跨学科的方法，我们首先进行了基于实验室的实验，以确定孵化的红海龟（Caretta caretta）如何响应磁场，这些磁场存在于沿着他们的迁徙路线的五个相距甚远的位置，然后通过在海洋环流模型中模拟它来研究观察到的行为的后果。与两个地理区域相关的磁场对小海龟构成风险（由于冬季寒冷的温度或迁移路线的潜在位移），引起定向游泳，而来自三个地点的磁场，表面电流和温度没有造成这样的风险。此外，在具有引起定向游泳的领域的位置，模拟表明，观察到的行为大大增加了海龟沿着沿着迁移路径前进的可能性。我们的研究结果表明，海龟的磁性导航行为与它们的海洋生态密切相关，并受到海洋环流和地磁动力学之间复杂相互作用的影响。突出显示的文章：基于实验室的实验和模拟海洋环流模型中观察到的行为，为磁导航如何塑造小海龟的生态提供了新的见解。
ABSTRACT During long-distance migrations, animals navigate using a variety of sensory cues, mechanisms and strategies. Although guidance mechanisms are usually studied under controlled laboratory conditions, such methods seldom allow for navigation behavior to be examined in an environmental context. Similarly, although realistic environmental models are often used to investigate the ecological implications of animal movement, explicit consideration of navigation mechanisms in such models is rare. Here, we used an interdisciplinary approach in which we first conducted lab-based experiments to determine how hatchling loggerhead sea turtles (Caretta caretta) respond to magnetic fields that exist at five widely separated locations along their migratory route, and then studied the consequences of the observed behavior by simulating it within an ocean circulation model. Magnetic fields associated with two geographic regions that pose risks to young turtles (due to cold wintertime temperatures or potential displacement from the migratory route) elicited oriented swimming, whereas fields from three locations where surface currents and temperature pose no such risk did not. Additionally, at locations with fields that elicited oriented swimming, simulations indicate that the observed behavior greatly increases the likelihood of turtles advancing along the migratory pathway. Our findings suggest that the magnetic navigation behavior of sea turtles is intimately tied to their oceanic ecology and is shaped by a complex interplay between ocean circulation and geomagnetic dynamics. Highlighted Article: Lab-based experiments and simulations of observed behavior in an ocean circulation model give new insight into how magnetic navigation shapes the ecology of small sea turtles.