橙腹樹蛙 (Rhacophorus aurantiventris) 生殖行為及生態學之研究

The Reproductive Behaviour and Ecology of Orange-Belly Treefrog, Rhacophorus aurantiventris

李文傑(Wen-Jay Lee) ； 呂光洋(Kuang-Yang Lue)

《Bio Formosa》 38卷2期 (2003/12) Pp. 97-112

摘要

From September 2000 to November 2001, we investigated the reproductive behaviour, calling activity pattern and diets of the orange-belly treefrog, Rhacophorus aurantiventris, from a subtropical primary deciduous forest in Taitung, south-eastern part of Taiwan. The study site was located at an elevation of ca. 950 m along the edge of Li-Chan Forestry Trail (22°48’30’’N，121°01’30’’E). All treefrogs were individually identifiable by toe-chipping.
R. aurantiventris showed sexual dimorphism in which snout vent length (SVL) of females (66.9±2.18 mmn=10) was significantly greater than that of males (56.2±2.35 mm，n=117，t=13.9，P＜0.001). The operational sex ratio (OSR) skewed toward males (♂:♀=7.0:1). Reproductive data from males and females suggest that the breeding season was from April to November in 2001 and reproductive activity was correlated with rainfall. No breeding peak was found in this study.
The male calling activity was most intense, shortly after dusk and increased throughout the early evening hours (between 1800 and 2400 h). The calls may be separated into advertisement, encounter, and distress calls. The average number of eggs in one clutch ranged from 1 to 44, and the egg diameter ranged from 3.3 to 4.6 mm. The egg size was the largest, while the clutch size was the smallest among the Rhacophorus genus from Taiwan.
The number of foam nests hatched approached 83.8% due to the limitation imposed by the amount and quality of water hole. Predation by the dragonfly larvae, Orthetrum triangular subsp., was the leading cause of tadpole mortality. Diets consisted of invertebrates of the classes Gastropoda, Arachnida, Chilopoda and Insecta. There was temporal reproductive partition between R. aurantiventris and Chirixalus eiffingeri. It was suspected that the quality of the oviposition site wasthe main limiting factor for the population size of this green treefrog in the wild.

關鍵字

橙腹樹蛙 ； 雌雄二型性 ； 雌雄性比 ； 資源防禦系統 ； 生殖區隔

並列摘要

From September 2000 to November 2001, we investigated the reproductive behaviour, calling activity pattern and diets of the orange-belly treefrog, Rhacophorus aurantiventris, from a subtropical primary deciduous forest in Taitung, south-eastern part of Taiwan. The study site was located at an elevation of ca. 950 m along the edge of Li-Chan Forestry Trail (22°48’30’’N，121°01’30’’E). All treefrogs were individually identifiable by toe-chipping.
R. aurantiventris showed sexual dimorphism in which snout vent length (SVL) of females (66.9±2.18 mmn=10) was significantly greater than that of males (56.2±2.35 mm，n=117，t=13.9，P＜0.001). The operational sex ratio (OSR) skewed toward males (♂:♀=7.0:1). Reproductive data from males and females suggest that the breeding season was from April to November in 2001 and reproductive activity was correlated with rainfall. No breeding peak was found in this study.
The male calling activity was most intense, shortly after dusk and increased throughout the early evening hours (between 1800 and 2400 h). The calls may be separated into advertisement, encounter, and distress calls. The average number of eggs in one clutch ranged from 1 to 44, and the egg diameter ranged from 3.3 to 4.6 mm. The egg size was the largest, while the clutch size was the smallest among the Rhacophorus genus from Taiwan.
The number of foam nests hatched approached 83.8% due to the limitation imposed by the amount and quality of water hole. Predation by the dragonfly larvae, Orthetrum triangular subsp., was the leading cause of tadpole mortality. Diets consisted of invertebrates of the classes Gastropoda, Arachnida, Chilopoda and Insecta. There was temporal reproductive partition between R. aurantiventris and Chirixalus eiffingeri. It was suspected that the quality of the oviposition site wasthe main limiting factor for the population size of this green treefrog in the wild.

並列關鍵字

Rhacophorus aurantiventris ； sexual dimorphism ； operational sex ratio (OSR) ； clutch size