南山溪蝴蝶多樣性的相關因子分析

Butterfly Diversity and Abundance in Relation to Environmental Factors in the Nan-San River Basin

本研究應用地理資訊系統，探討南山溪流域蝶相與開發程度、蜜源植物、寄主植物及坡度、坡向等地形因子的相關性。結果顯示在南山溪流域地區，蝴蝶種類與數量在南向坡及坡度11-20°間之環境較多，且與林木鬱閉度、海拔高度、距住宅區距離有正相關（p<0.01），而與路面的材質有負相關（p<0.01），並與蜜源植物及寄主植物的數量沒有顯著相關性。本研究結果顯示，開發程度越高，越不利於蝴蝶多樣性保育。 We used the geographic information system (GIS) to investigate the diversity and abundance of butterflies in relation to aspects and slopes of lands, abundance of nectar plants and host plants, and disturbance of human activities in the Nan-San River Basin. The results showed that the butterflies preferred to the south aspect and the slopes at 11-20° The species diversity and abundance were correlated significantly, positively with canopy covers, elevations, and distances to the rural areas (p＜0.0l), but negatively with road types (p＜0.0l). There was no significant correlation between the diversity and abundance of the butterflies and the abundance of their nectar-plants and host-plants (p＞0.05). The above results suggest that human disturbance was the most damaging factor and should be the primary concern in conservation of the butterflies in the basin.