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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Vertical Niche Overlap By Two Ocean Giants With Similar Diets: Ocean Sunfish And Leatherback Turtles
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Vertical Niche Overlap By Two Ocean Giants With Similar Diets: Ocean Sunfish And Leatherback Turtles

机译：两名具有类似饮食的海洋巨人的垂直生态位重叠：海洋翻车鱼和棱皮海龟

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We used satellite tags to record the patterns of depth utilisation for four ocean sunfish (Mola mola) and two leatherback turtles (Dermochelys coriacea) moving in broadly the same area off South Africa. Individuals were tracked for between 2 and 8 months and dive data relayed via satellite. For all the sunfish and one of the turtles, we received binned data on depth distribution, while for the second turtle we received individual dive profiles along with the proportion of time spent diving. Leatherback turtles dived almost exclusively within the upper 200 m, spending only 0.6 and 0.2% of their time >200 m. There were times when sunfish likewise occupied these relatively shallow depths. However, there were also protracted periods when sunfish spent the majority of their time much deeper, with one individual remaining around 500 m for many hours at a time. These results suggest that sunfish sometimes exploit deeply distributed prey which is beyond the foraging range of leatherback turtles. We conclude that while both species are believed to feed predominantly on gelatinous zooplankton, the fact that sunfish do not need to come to the surface to breathe means that they can occupy an expanded vertical niche compared to the leatherback turtle.
机译：我们使用卫星标签记录了四个海洋翻车鱼（Mola mola）和两个棱皮海龟（Dermochelys coriacea）在南非大致同一地区移动的深度利用模式。跟踪个人2到8个月，并通过卫星中继潜水数据。对于所有翻车鱼和其中一只乌龟，我们收到了深度分布的分类数据，而对于第二只乌龟，我们则收到了单独的潜水资料以及潜水所花费的时间比例。棱皮海龟几乎只在200 m的高空潜水，而在> 200 m的时间中仅花费0.6和0.2％的时间。有时翻车鱼同样占据了这些相对浅的深度。但是，在有些长时间的情况下，翻车鱼的大部分时间都花在了更深的地方，一个人一次只能停留在500 m左右许多小时。这些结果表明翻车鱼有时会利用分布广泛的猎物，这超出了棱皮海龟的觅食范围。我们得出的结论是，虽然认为这两个物种主要以胶质浮游动物为食，但是翻车鱼不需要sun到表面进行呼吸这一事实意味着与fish皮龟相比，翻车鱼可以占据更大的垂直生态位。

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