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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Differences in diurnal and nocturnal swimming patterns of olive ridley hatchlings in the Gulf of Fonseca, Honduras
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Differences in diurnal and nocturnal swimming patterns of olive ridley hatchlings in the Gulf of Fonseca, Honduras

机译：洪都拉斯丰塞卡湾橄榄Ridley幼鱼的昼夜游泳方式差异

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摘要

Sea turtle hatchlings from Honduran beaches along the Pacific coast must swim more than 30 km through the shallow, presumably predator-rich waters of the Gulf of Fonseca before reaching the open ocean. Olive ridley hatchlings from Punta Raton, Honduras, were tracked during the first 2 h of their offshore migration to assess aquatic predation rates. No predation events were observed. The absence of rocky bottom areas and reef structures where predators can refuge, and a decline in the number of predators due to overfishing are two possible reasons for this unexpected result. Additionally, diurnal and nocturnal swimming patterns of recently emerged olive ridley hatchlings were compared with regard to their position in the water column while swimming. At night hatchlings swam near the surface 97.5% of the time, with only sporadic brief dives. During daytime, however, hatchlings spent 78% of the time swimming at depth, going back to the surface for brief periods to breathe. Due to the high turbidity of the Gulf of Fonseca waters, this daytime behavior may serve to keep hatchlings out of sight of predatory sea birds. This newly described differential swimming behavior may have adaptive significance in avoiding aerial predation in the specific conditions of the Gulf of Fonseca. (C) 2015 Published by Elsevier B.V.
机译：来自太平洋沿岸洪都拉斯海滩的海龟幼体必须游过丰塞卡湾浅水区（大概是掠食者丰富的水域）后超过30公里，才能到达远洋。在洪都拉斯蓬塔拉顿的橄榄色幼体孵化场中，在其离岸迁移的前两个小时内对其进行了跟踪，以评估其水生动物的捕食率。没有观察到掠食事件。捕食者可以避难的岩石底部区域和礁石结构的缺乏，以及由于过度捕捞导致捕食者数量的减少是导致这种意外结果的两个可能原因。此外，还比较了最近出现的橄榄色ridley幼体在游泳时在水柱中的位置的昼夜游泳方式。夜间，幼鱼有97.5％的时间在水面附近游动，只有偶尔的短暂潜水。然而，在白天，孵化的幼鱼有78％的时间是在深水里游泳，然后短暂回到水面呼吸。由于丰塞卡湾水域的高浊度，这种白天的行为可能使孵化场的孵化器远离掠夺性海鸟。新近描述的这种差异游泳行为在避免丰塞卡湾特定条件下的空中掠夺中可能具有适应性意义。 （C）2015由Elsevier B.V.发布

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