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首页> 外文期刊>Marine biology >Ontogenetic diet shifts of green sea turtles (Chelonia mydas) in a mid-ocean developmental habitat
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Ontogenetic diet shifts of green sea turtles (Chelonia mydas) in a mid-ocean developmental habitat

机译：大洋中部生境中绿海龟（Chelonia mydas）的个体发育饮食变化

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Green sea turtles (Chelonia mydas) arrive on the geographically isolated Bermuda platform as small juveniles and remain until they are approaching sexual maturity, at which point individuals depart for distant feeding and nesting sites. It has been reported that younger green turtles generally tend to carnivory or omnivory and that seagrasses become a significant food source as the turtles grow. Evidence indicates that grazing by green sea turtles in Bermuda is negatively impacting seagrass beds, thus understanding their diets is important to both conserving the turtles and their food. Stable isotope methods were used to investigate ontogenetic diet shifts of green sea turtles and to determine reliance on seagrass by larger turtles. Skin samples from 157 individual turtles and samples of known turtle foods, plants and animals, were collected for determination of consumer and food delta C-13 and delta N-15 values. A Bayesian stable isotope mixing model analysis indicated a wide range among individual turtles' diets, with the greatest differences occurring between small and large turtles; larger turtles consumed seagrass almost exclusively. We also examined diet changes in 12 turtles captured in two successive years; these recapture data confirmed the changes in diet suggested by the relationship between size of turtles and diet composition. Very limited evidence was found of any diet variation among larger turtles that would indicate a shift away from declining seagrasses as their major food source.
机译：绿海龟（Chelonia mydas）会以小幼体的形式到达地理隔离的百慕大平台，直到它们达到性成熟为止，这时个体将前往遥远的觅食和筑巢地点。据报道，年轻的绿海龟一般倾向于食肉或杂食性，随着海龟的生长，海草成为重要的食物来源。有证据表明，百慕大的绿海龟放牧对海草床产生了负面影响，因此了解它们的饮食对于保护海龟及其食物都非常重要。稳定的同位素方法用于研究绿海龟的自体饮食变化，并确定大型海龟对海草的依赖性。收集了来自157只海龟的皮肤样本以及已知的海龟食物，植物和动物的样本，以确定消费者和食物的C-13和N-15值。贝叶斯稳定同位素混合模型分析表明，各个海龟的日粮分布范围很广，大小海龟之间的差异最大。较大的海龟几乎全部消耗海草。我们还研究了连续两年捕获的12只海龟的饮食变化。这些捕获数据证实了海龟大小与日粮组成之间的关系表明了日粮的变化。很少有证据表明大型海​​龟的饮食有任何变化，这表明海草已不再是其主要食物来源，而是在逐渐减少。

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    《Marine biology》 |2018年第2期|33.1-33.12|共12页
  • 作者

    Burgett Claire M.; Burkholder Derek A.; Coates Kathryn A.; Fourqurean Virginia L.; Kenworthy W. Judson; Manuel Sarah A.; Outerbridge Mark E.; Fourqurean James W.;

  • 作者单位

    Florida Int Univ, Dept Biol Sci, Marine Educ & Res Ctr, OE148,11200 SW 8th St, Miami, FL 33199 USA;

    Florida Int Univ, Dept Biol Sci, Marine Educ & Res Ctr, OE148,11200 SW 8th St, Miami, FL 33199 USA;

    Bermuda Minist Environm, Dept Environm & Nat Resources, FL 04, Hamilton Parish, Bermuda;

    Miami Palmetto Senior High Sch, 7460 SW 118th St, Pinecrest, FL 33156 USA;

    109 Holly Lane, Beaufort, NC 28516 USA;

    Bermuda Minist Environm, Dept Environm & Nat Resources, FL 04, Hamilton Parish, Bermuda;

    Bermuda Minist Environm, Dept Environm & Nat Resources, FL 04, Hamilton Parish, Bermuda;

    Florida Int Univ, Dept Biol Sci, Marine Educ & Res Ctr, OE148,11200 SW 8th St, Miami, FL 33199 USA;

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