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首页> 外文期刊>Chelonian conservation and biology >Do Marine Turtles Use Odors to Locate Foraging Hotspots in the Open Ocean?
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Do Marine Turtles Use Odors to Locate Foraging Hotspots in the Open Ocean?

机译：海龟会利用异味在公海中寻找觅食热点吗？

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Marine turtles in the open ocean often forage in areas of enhanced productivity, but how they locate those sites and what they do once there is poorly understood. One possibility is that odors from prey might be informative. We explored those possibilities in laboratory experiments using juvenile marine turtles. We analyzed responses to an airborne by-product of predation (dimethyl sulfide or DMS) and to airborne and waterborne odors made from extracts of fresh prey (squid, jellyfish, penaeid shrimp, and algae [Sargassum spp.]). Observations were made in a seawater-filled arena containing an enclosed air space. Airborne odors were delivered across the water surface and waterborne odors were introduced as extracts into the water. Tethered loggerheads (Caretta caretta) and leatherbacks (Dermochelys coriacea) failed to swim "upwind" in the presence of any airborne odor, suggesting that these stimuli, alone, do not evoke orientation from a distance. Free-swimming loggerheads and green turtles (Chelonia mydas), presented with either an airborne or waterborne squid odor, directed bites at the tank walls, at one another, and (most frequently) at a stationary visual stimulus (a small plastic sphere) anchored under water. DMS did not evoke a comparable response. We conclude that close to productive hot spots, both air-and waterborne prey odors elicit a similar visual search for underwater prey targets. A review of the literature suggests that at a distance, juvenile turtles might use magnetic maps to locate areas that include sites of greater oceanic productivity.
机译：公海中的海龟经常在生产力提高的地区觅食，但是人们对它们的定位方式以及一旦到达那里的做法知之甚少。一种可能性是，猎物的气味可能有益。我们在使用少年海龟的实验室实验中探索了这些可能性。我们分析了对捕食的空气传播副产物（二甲基硫醚或DMS）的反应以及对新鲜猎物（鱿鱼，水母，对虾和藻类[Sargassum spp。]）提取物产生的空气和水味的反应。在充满密闭空间的充满海水的竞技场中进行观察。空气中的气味散发到整个水表面，而水性气味作为提取物引入水中。系留的（Caretta caretta）和棱皮背（Dermochelys coriacea）在存在任何空气异味的情况下都无法“逆风”游泳，这表明这些刺激单独不会引起远处的定向。自由游的green和绿海龟（Chelonia mydas）带有空气或水生乌贼味，直接咬在罐壁上，彼此咬在一起，并且（最常见）是在固定的视觉刺激（小塑料球）上锚定的在水下。 DMS没有引起类似的反应。我们得出的结论是，空中和水上的猎物气味都接近生产热点，因此可以对水下猎物目标进行类似的视觉搜索。文献综述表明，在一定距离内，幼龟可能会使用磁性地图来定位包含更高海洋生产力的地点的区域。

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