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首页> 外文期刊>Canadian Journal of Zoology >Changes in diel diving patterns accompany shifts between northern foraging and southward migration in leatherback turtles
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Changes in diel diving patterns accompany shifts between northern foraging and southward migration in leatherback turtles

机译：diel潜水模式的变化伴随着棱皮龟北部觅食和向南迁徙的转变

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Diel diving patterns have been widely documented among plankton-feeding marine vertebrates. In many cases, these patterns have been interpreted as a response to the diel vertical migrations of prey. The leatherback turtle, Dermochelys coriacea (Vandelli, 1761), is a large marine predator that exploits gelatinous plankton in disparate foraging areas. Individuals of this species spend extended periods at northern latitudes before moving southward through pelagic waters. To identify and compare potential diel patterns of diving behaviour in temperate areas, where foraging has been observed, versus during southward migration, 15 subadult and adult leatherbacks were equipped with satellite-linked time-depth recorders off Nova Scotia, Canada. We observedvariation in nocturnal versus diurnal behaviour, both at northern latitudes and during migration; however, diel differences in both diving and surface activity were much less pronounced while leatherbacks were in the north. We interpret the difference inleatherback diel diving regimen to reflect a response to changing resource conditions at these times, with leatherbacks foraging throughout the day and night at high latitudes, then changing to a bimodal pattern of diving during southward migration, with generally longer, deeper diving occurring during the night versus during the day. By quantifying diel changes in leatherback behaviour, we provide the first surface time correction factors based on multiple individuals for use in estimating abundance from aerial surveys.
机译：在以浮游生物为食的海洋脊椎动物中，迪尔的潜水模式已被广泛记录。在许多情况下，这些模式已被解释为对猎物diel垂直迁移的反应。棱皮海龟Dermochelys coriacea（Vandelli，1761）是大型海洋捕食者，在不同的觅食区利用凝胶状浮游生物。该物种的个体在北纬度过较长的时间，然后向南移动通过中上层水域。为了确定和比较观察到觅食的温带地区与向南迁徙期间潜水行为的潜在迪尔模式，与加拿大向南迁徙期间相比，在加拿大新斯科舍省附近的15个亚成年和成年棱皮背上配备了与卫星相关的时间深度记录仪。在北纬和迁徙期间，我们观察到夜间行为与昼夜行为的差异。然而，在北部的棱皮背上，潜水和表面活动的迪尔差异不明显。我们解释不同的背背diel潜水方案，以反映在这种情况下对资源条件变化的反应，在高纬度地区白天和黑夜白天觅食棱皮背，然后在向南迁徙期间转变为双峰潜水模式，通常潜水时间更长，更深发生在晚上与白天。通过量化棱皮行为的diel变化，我们提供了基于多个个体的第一个表面时间校正因子，用于从航空勘测中估算丰度。

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