Dietary shifts of frog eating snakes in response to seasonal changes in prey availability
Dietary shifts of frog eating snakes in response to seasonal changes in prey availability
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DOI：
10.1670/182-03an
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发表时间：
2004-09-01
影响因子：
0.8
通讯作者：
Hirai, T
中科院分区：
文献类型：
--
作者：
Hirai, T
以稻田无尾两栖类动物区系为参照，对四纹锦蛇和虎斑槽蛇的食性进行了研究。日本雨蛙和许氏树蛙成虫在春季暂时栖息于稻田进行繁殖，黑斑蛙和泽蛙幼鱼在初夏羽化后即为稻田居民。为了应对这些季节性变化，这两种蛇的猎物选择显着转移，从成年的H。japonica和Rh. schlegelii在春季对Ra. nigromaculata和Ra.夏天的泽蛙这些结果强烈表明，稻田栖息地之间的小成年青蛙和青少年的大青蛙的季节性分区允许这些蛇在整个温暖的季节不断在稻田觅食。
The diet of two rice-field inhabiting snakes, Elaphe quadrivirgata and Rhabdophis tigrinus, was examined with reference to rice-field anuran fauna. Although adult Hyla japonica and Rhacophorus schlegehi inhabit rice fields temporarily in spring for reproduction, juvenile Rana nigromaculata and Rana limnocharis are residents of rice fields after emerging in early summer. In response to these seasonal changes, both snakes shifted their prey selection dramatically from adults of H. japonica and Rh. schlegelii in spring to juveniles of Ra. nigromaculata and Ra. limnocharis in summer. These results strongly suggest that the seasonal partitioning of rice-field habitats between small adult frogs and juveniles of larger frogs allows these snakes to continuously forage in rice fields throughout the warm season.