高海拔長期生態研究

Abstract

我們在1999年至2004年間在塔塔加地區三個不同樣區內，定期調查優勢種爬蟲類臺灣蜓蜥(Sphenomorphus taiwanesis)所利用的掩體環境及數量變化，並在其中臺灣蜓蜥最多的石山樣區，利用標放再捕捉法及尋獲率兩種方式觀測其於2001~2004年間每月的數量變化。標放再捕捉法是於每次調查的第一次以剪趾方式標記捕獲個體後放回，在第二天再以捕獲的個體數量，依Baily公式估算族群量；而獲率是以每以調查所捕獲的蜥蜴數量除以總翻尋掩體數計算而得。結果顯示：(一)臺灣蜓蜥的數量在石山樣區最多，在神木林道較為稀少，而鹿林水源則未曾尋獲；每個樣區內臺灣蜓蜥的數量多寡很可能與其日照程度以及與適合其躲藏的掩體數量有關；(二)臺灣蜓蜥以躲藏在石塊下的比例最高，木塊及其它類型的掩體較少；(三)臺灣蜓蜥所利用之掩體的底質以潮濕底質多於乾燥或有積水的底質，而有植物的底質也多於沒有植物生長的底質；(四)依標放再捕捉法及獲率兩種方法的結果都顯示石山樣區內的臺灣蜓蜥數量在2004年時明顯下降，這可是該年春天時遭受施工破壞所導致。

The habitat use and population size of the high mountain skink, Sphenormaorphus taiwanensis, were investigated once each month at three smapling sties in the Tatachia area from November 1999 to September 2004. At Shihshan site, the change in the number of S. taiwanensis from 2001 to 2004 was estimated by monthly survey using two methods: the mark-recapture method and the capture rate method. we performed mark-recapture method in two contingent half-day surveys each month, marking individuals by clipping their toes in the first dya, re-sampling in the second day, then estimating the population size by Baily’s method. the capture rate method was defined as the ratio of the number of the captured individuals to the number of turned over covers. The results showed that (1) The Largest population size was found at Shihshan (石山) site, while Shenmu (神木) site had a smaller population size and Lulin (鹿林) site had no population at all. In addition, the number of S. taiwanensis may be related to the abundance of sunlight and potential habitat rocks, (2) We found most of the S. taiwanensis under rock covers, and rarely under logs or other kinds of covers, (3) S. taiwanensis were most frequently hiding under covers with moist ground underneath than with dry ground; with vegetation than without vegetation, and (4) A decline in the population size of S. taiwanensis in 2004 might due to human disturbance. That is, the removal of potential habitat rocks during the spring of 2004.