- 期刊
Abundance and Movement of a Riparian Frog (Rana swinhoana) in a Subtropical Forest of Guandau Stream, Taiwan
關刀溪產斯文豪氏赤蛙族群數量及移動之研究
摘要
我們利用標放法在臺灣中部關刀溪研究斯文豪氏赤蛙之族群生態學，時間是從1996年8月至1998年7月。我們在關刀溪一支流的水源地設300m調查線，每月連續兩個晚上調查斯文豪氏赤蛙。我們記錄個體性別、吻肛長、體重、及捕捉地點。我們共觀察1947之蛙，其中1414及172隻分別為雄及雌蛙。在夏季活動的青蛙個體遠比冬季多。每月重新捕捉率大致在30%-81%之間。斯文豪氏赤蛙移動性低，同時也未有任何季節性的往上或下游移動的情形。沿河微棲地的異質性可能解釋何以青蛙沿溪呈塊形分布。斯文豪氏赤蛙有時也會做長距離的移動，但牠皆能回到自己的活動範圍。研究結果顯示斯文豪氏赤蛙和其他河川蛙類一樣屬移動性低的種類。因為長時間居住在河濱帶，青蛙可能已經得到生活上所需資源，所以不必做長距離的移動。
並列摘要
We studied a population of Rana swinhoana using mark-recapture methods from August 1996 to July 1998 at the Long-term Ecological Research (LTER) site at Guandau Stream, Taiwan. We established a 330-m transect at the headwaters of a tributary of Guandau Stream and censused R. swinhoana for 2 consecutive nights monthly. We used markrecapture techniques to sample frogs along transects, with each individual being uniquely marked. For every animal captured, we recorded clip, sex, snout-vent length, body mass of frogs, and location along the transect. We observed 1947 but captured 1608 frogs during the 24-mo study period, including 1414 adult males and 172 adult females. Frogs were more abundant in the summer than in the winter. Monthly recapture rates varied between 30% and 81%. R. swinhoana moved little during the study and showed no seasonal up- or down-stream movements. The clumped distribution of frogs along the stream is probably a result of the heterogeneity of microhabitats. R. swinhoana sometimes made extended excursions, but returned to their usual activity ranges. The results of this study suggest that R. swinhoana, like many riparian anurans, is a sedentary animal with homing ability. By inhabiting riparian zones, R. swinhoana probably obtains sufficient ecological necessities such that long-distance movements are not required.