研究生: |
李文傑 |
---|---|
論文名稱: |
橙腹樹蛙生殖行為及生態學之研究 |
指導教授: | 呂光洋 |
學位類別: |
碩士 Master |
系所名稱: |
生命科學系 Department of Life Science |
論文出版年: | 2002 |
畢業學年度: | 90 |
語文別: | 中文 |
論文頁數: | 72頁 |
中文關鍵詞: | 雌雄二型性 、雌雄性比 、卵泡 、食性 、生殖隔離 |
論文種類: | 學術論文 |
相關次數: | 點閱:372 下載:36 |
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研究者從民國89年9月至90年11月,在台東利嘉林道11.5公里、海拔950公尺原始闊葉林中,以剪趾法(toe clipping)和催吐法進行橙腹樹蛙(Rhacophorus aurantiventris)生殖行為及生態學的研究。 研究結果顯示,橙腹樹蛙雌雄個體在體型、鳴囊等特徵上有差異,屬於雌雄二型性(sexual dimorphism)(雌蛙SVL Mean=66.9㎜ ; 雄蛙SVL Mean=56.2㎜,P<0.01)。利嘉林道橙腹樹蛙繁殖季為4月~11月,繁殖季中的生殖活動強度與降雨量呈顯著相關。雄蛙在繁殖季時,會在積水樹洞週遭鳴叫,活動範圍不超過3公尺,雌蛙僅在產卵當天出現,交配系統屬於雄蛙控制的資源防禦系統(resource defense mating system)。每夜生殖活動的雌雄性比(OSR)偏向雄蛙(1:7)。 雄蛙會在葉面和樹枝上鳴叫,鳴叫時停棲的高度以1~2公尺範圍居多,少數個體會爬到6公尺高的植株上鳴叫。叫聲的種類可分為宣告叫聲、遭遇叫聲和壓迫叫聲等三種。當雌蛙受雄蛙鳴聲吸引而主動接近雄蛙形成配對,配對時由雌蛙背負雄蛙至倒木積水樹洞中產卵。雌雄蛙每次產一個白色橢圓形卵泡,每個卵泡平均含有22.1顆卵粒,卵粒平均直徑為3.9㎜。 橙腹樹蛙產卵位置受限於積水樹洞的多寡和品質,卵泡孵化率高達83.8%。蝌蚪期的天敵以鼎脈蜻蜓幼蟲和食卵性艾氏樹蛙蝌蚪為主,成蛙在樣區內則較少發現天敵捕食。雄性橙腹樹蛙的食性以無脊椎昆蟲綱直翅目和蛛形綱為主。在生殖季節上,橙腹樹蛙跟艾氏樹蛙具有時間上的生殖區隔(Temporal reproductive partition)現象。產卵場所的有無,可能是橙腹樹蛙族群的一重要限制因子。 From September 2000 to November 2001, we investigated the reproductive behaviour, activity range and diets of the orange-belly treefrog, Rhacophorus aurantiventris, from a subtropical primary deciduous forest in the southeastern 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 SVL of females (66.9±2.18㎜,n=10) was significantly greater than that of males (56.2±2.35㎜,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. No peak of breeding was found. Male’s 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 mean egg diameter ranged from 3.3 to 4.6㎜. The egg size was the largest which the clutch size was the smallest among the Rhacophorus Genus from Taiwan. Predation by the dragonfly larvae, Orthetrum triangular subsp., was the leading causes of tadpole mortality. Diets consisted of invertebrates of classes Gastropoda, Arachnida, Chilopoda and Insecta. Choices made by females are thought to enhance temporal reproductive partition from R. aurantiventris and Chirixalus eiffingeri. It was suspected that the quality of oviposition site is the main limiting factor for the population size of this green treefrog in the wild.
From September 2000 to November 2001, we investigated the reproductive
behaviour, activity range and diets of the orange-belly treefrog, Rhacophorus
aurantiventris, from a subtropical primary deciduous forest in the southeastern
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 SVL of females (66.9±2.18
㎜,n=10) was significantly greater than that of males (56.2±2.35㎜,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. No peak of breeding was found.
Male’s 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 mean egg diameter ranged
from 3.3 to 4.6㎜. The egg size was the largest which the clutch size was the
smallest among the Rhacophorus Genus from Taiwan.
Predation by the dragonfly larvae, Orthetrum triangular subsp., was the
leading causes of tadpole mortality. Diets consisted of invertebrates of
classes Gastropoda, Arachnida, Chilopoda and Insecta. Choices made by females
are thought to enhance temporal reproductive partition from R. aurantiventris
and Chirixalus eiffingeri. It was suspected that the quality of oviposition
site is the main limiting factor for the population size of this green
treefrog in the wild.
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