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Ontogenetic change in the diet of the pond frog, Rana nigromaculata

机译:蛙蛙蛙日粮的个体发育变化

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I analyzed 478 diet samples of Rana nigromaculata across its natural size range to examine the dietary changes of this species during postmetamorphic ontogeny. As the frogs increased in size, they increased total diet volume, but decreased the number of prey items. Also, individuals ontogenetkally increased the mean, minimum and maximum prey volume in the stomach. The mean volume of the major prey taxa consumed by the frogs varied considerably. Small prey, such as ants and dipterans, were found less frequently as the size of the frogs increased, but large prey, such as beetles and orthopterans, were more frequently recovered from larger frogs. These results suggest that ontogenetic diet change should be considered when the structure of an anuran community is investigated using food niche analysis.
机译:我分析了其自然大小范围内的478种黑蛙(Rana nigromaculata)饮食样本,以检查该亚种在变质后个体发育过程中的饮食变化。随着青蛙大小的增加,它们增加了总的饮食量,但减少了猎物的数量。而且,个体个体遗传地增加了胃中平均,最小和最大的猎物体积。青蛙消耗的主要猎物分类单元的平均数量差异很大。随着青蛙大小的增加,发现较小的猎物(例如蚂蚁和双足动物)的频率降低了,但是从大型青蛙中更频繁地发现了大型的猎物(例如甲虫和直翅目动物)。这些结果表明,在利用食物生态位分析调查无脊椎动物群落结构时应考虑个体发育的饮食变化。

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