Loggerhead Caretta caretta and leatherback Dermochelys coriacea sea turtles are caught frequently as longline bycatch. Loggerhead turtles are often hooked in the mouth, while leatherbacks often are hooked in the shoulder or flippers. Comparisons of feeding behavior and accuracy in biting surrogate ‘prey’ targets, in the presence of waterborne food odors, identified species-specific differences that may predispose the turtles to be hooked differently. Additionally, the visual fields of post-hatchling loggerhead and leatherback sea turtles were measured and compared to determine if field of view could further contribute to feeding behavior differences and refining the explanation as to why the 2 species are hooked differently. We found that loggerhead turtles, which have a larger visual field and a small area of binocular vision, were more accurate when biting a target than leatherbacks. These traits may explain their greater incidence of mouth, throat, and stomach hookings. Leatherback turtles have a smaller field of view and no overlap of visual fields, and they were less accurate in apprehending targets. Leatherbacks lack binocular vision, which might explain why they are prone to entanglement or hooking external to the mouth more often than loggerheads. Together, visual field and biting accuracy may help explain why leatherbacks and loggerheads differ in how they interact with fishing lines and the locations of their hookings. Such understanding of the species’ behavior and limits of visual fields is essential for formulating further bycatch reduction approaches.

中文翻译：

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蠵龟和棱皮龟的摄食行为和视野差异可以解释延绳钓渔业相互作用的差异

Loggerhead Caretta caretta 和棱皮龟 Dermochelys coriacea 海龟经常作为延绳钓副渔获物捕获。红海龟经常钩在嘴里，而棱皮龟经常钩在肩膀或鳍状肢上。在存在水性食物气味的情况下，比较摄食行为和咬替代“猎物”目标的准确性，确定了可能使海龟以不同方式被钩住的物种特异性差异。此外，对孵化后的红海龟和棱皮海龟的视野进行了测量和比较，以确定视野是否可以进一步促进摄食行为的差异，并完善对为什么这两个物种上钩不同的解释。我们发现，拥有较大视野和较小双眼视觉区域的蠵龟，在咬目标时比棱皮龟更准确。这些特征可能解释了他们嘴巴、喉咙和胃钩的发生率更高的原因。棱皮龟的视野更小，视野没有重叠，它们捕捉目标的准确性较低。棱皮龟没有双眼视觉，这或许可以解释为什么它们比赤蠵龟更容易被缠住或钩住嘴巴。总之，视野和咬合准确度可能有助于解释为什么棱皮龟和蠵龟在与鱼线的相互作用和钩住的位置方面存在差异。这种对物种行为和视野限制的理解对于制定进一步减少兼捕的方法至关重要。和胃钩。棱皮龟的视野更小，视野没有重叠，它们捕捉目标的准确性较低。棱皮龟没有双眼视觉，这或许可以解释为什么它们比赤蠵龟更容易被缠住或钩住嘴巴。总之，视野和咬合准确度可能有助于解释为什么棱皮龟和蠵龟在与鱼线的相互作用和钩住的位置方面存在差异。这种对物种行为和视野限制的理解对于制定进一步减少兼捕方法至关重要。和胃钩。棱皮龟的视野更小，视野没有重叠，它们捕捉目标的准确性较低。棱皮龟缺乏双眼视觉，这或许可以解释为什么它们比赤蠵龟更容易被缠住或钩住嘴巴。总之，视野和咬合准确度可能有助于解释为什么棱皮龟和蠵龟在与鱼线的相互作用和钩住的位置方面存在差异。这种对物种行为和视野限制的理解对于制定进一步减少兼捕方法至关重要。这或许可以解释为什么它们比蠵龟更容易缠结或钩住嘴巴。总之，视野和咬合准确度可能有助于解释为什么棱皮龟和蠵龟在与鱼线的相互作用和钩住的位置方面存在差异。这种对物种行为和视野限制的理解对于制定进一步减少兼捕的方法至关重要。这或许可以解释为什么它们比蠵龟更容易缠结或钩住嘴巴。总之，视野和咬合准确度可能有助于解释为什么棱皮龟和蠵龟在与鱼线的相互作用和钩住的位置方面存在差异。这种对物种行为和视野限制的理解对于制定进一步减少兼捕方法至关重要。