臺灣博碩士論文加值系統

本研究分為兩大部分，第一部份為生殖生態研究，從1999年5月1日到9月30日，在枋腳溪中游固定樣區研究觀察，記錄其生殖生物學資料及棲地特徵。第二部份為族群分布研究，從2000年6月23日至9月14日，每週於雙溪河流域的15個樣點中記錄褐樹蛙的性別、數量及環境因子。
1999年生殖生態的研究結果發現，褐樹蛙有明顯的雌雄二型性，雌蛙平均體長為雄蛙的1.48倍，平均體重為雄蛙的3.7倍。操作性比(operational sex ratio)為1：16.6 (雌：雄)，明顯偏向雄性。雄蛙競爭是靠停留之天數，配對成功的雄蛙中，有66.7%停留超過2天以上。雌蛙選擇屬於體型配對模式，選擇佔其體長68%的雄蛙配對。生殖季從5月17日到9月10日。生殖活動受到溫度升高的影響開始，偏好在晴天的夜晚進行生殖活動。雄蛙生殖活動時會偏好停棲在離水邊1m的範圍內、水淺、流速緩的4、5號石頭上鳴叫。
2000年的族群研究發現，褐樹蛙族群多分布在雙溪河流域各支流的上游，有4條支流(66.7%)上游的雄蛙族群數量顯著大於中、下游。丁子蘭溪的褐樹蛙族群數量最豐富。底石大小與雄蛙的出現數量有顯著的正相關，有3條支流(50%)上游的底石級數顯著大於中、下游。

目 錄
摘要.....................................i
前言.....................................1
材料與方法...............................3
一、生殖生態研究.......................3
二、族群研究...........................6
結果.....................................8
一、基礎生物學資料.....................8
二、生殖行為、配對與產卵...............9
三、生殖生態..........................11
四、族群分布..........................14
討論....................................16
一、生殖生物學........................16
配對系統(mating system).........16
性比差異........................18
性擇............................19
特殊的雌雄二型性................21
雌蛙之生產力(female fecundity)..22
溫度、雨量對生殖季的影響........24
二、族群分布..........................26
影響褐樹蛙族群分布之因素........26
三、保育..............................28
參考文獻................................31
圖......................................38
表......................................43
附錄....................................47

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