拉拉溪台灣水鼩食性初探

A Preliminary Investigation on Diet of the Taiwanese Water Shrew (Chimarrogale himalayica) from Lala Creek of Taiwan

本研究藉由檢視在桃園縣復興鄉海拔約1,800m的拉拉溪流域中所捕獲的台灣水鼩消化道內含物，以了解台灣地區水鼩的食性，並與其他地區的亞洲水鼩屬及歐亞水鼩屬的種類之食性進行比較。分析發現，台灣水鼩胃內含物的食糜碎片中具有大量的絲狀鰓與氣孔，據此判定水生昆蟲幼蟲應為其主要食物，其中包括毛翅目與蜉蝣目（昆蟲綱）。此外，亦發現蜘蛛目動物（蛛形綱）的碎片。結果顯示，拉拉溪捕獲之台灣水鼩的食物內容與其他地區亞洲水鼩屬的水鼩之食性相似，但與歐亞水鼩屬的水鼩有所差異。 In order to investigate the diet of Taiwanese water shrew (Chimarrogale himalayica) and to compare it with that of other water shrews in Euro-Asia, we examined the stomach contents of a specimen caught from the Lala Creek at an elevation of around 1,800m, Taoyuan County, Taiwan. Its stomach contents were mainly fragments of aquatic insect larvae, some of which could be identified as Trichoptera and Ephemeroptera (Class Isecta). Also, a few fragments belonging to species of Araneae (Class Arachnida) were found. The results showed that the diet of the water shrew in Taiwan is similar to that of other Chimarrogale species, but different from that of Neomys species.