溫度與水量對於澤蛙（Fejervarya limnocharis）蝌蚪體長及變態的影響

Effects of Temperature and Water Volume on Body Length and Metamorphosis of Indian Rice Frog (Fejervarya limnocharis) Tadpoles

本研究以台灣平地至低海拔地區常見的澤蛙（Fejervarya limnocharis）蝌蚪為對象，觀察在實驗室操作不同環境溫度及水量狀況下的蝌蚪存活及變態率，探討這些因子對於無尾兩棲類蝌蚪的影響。澤蛙蝌蚪在20℃、25℃、30℃下置於100ml、200ml、400ml水量飼養，於蝌蚪開始變態的第58天及結束實驗的第125天比較體長數據。結果20℃存活率最高但體長較小且無法變態，顯示低溫環境雖有利蝌蚪生存但不利其成長。水量多的環境中蝌蚪體長明顯較大，且溫度與水量對蝌蚪體長的影響有交互作用，顯示不同環境因子除了其個別效果外，彼此也會相互影響；依本研究結果推測，暖化可能造成棲地環境升溫而影響澤蛙幼體之存活。

To investigate the impacts of environmental temperature and water volume on metamorphosis and survival rates of anuran amphibians, Fejervarya limnocharis tadpoles were incubated at 20℃, 25℃, 30℃ with different water volumes. Survival rates of Fejervarya limnocharis tadpoles were highest under 20℃. Average body size was smaller at lower environmental temperature and lower water volume on Day 58 and Day 125 under the 20℃ treatment. Tadpoles in high water volume treatments reached significantly larger body size. This suggests that lower temperature is favorable to the survival of tadpoles, but harmful to their growth. In spite of singular effects on growth, there was also remarkable correlation between environmental temperature and water volume factors on the body length of the tadpoles.