格斯特家白蟻 (Coptotermes gestroi (Wasmann)) 是世界廣布的入侵種，為都市及森 林害蟲，目前已於臺灣中南部的都市地區及中部低海拔的森林中立足，具有進一步擴散至 中高海拔山區、危害臺灣森林的潛在威脅。為瞭解格斯特家白蟻的擴散範圍，本研究於下 坪自然教育園區 (下坪熱帶植物園) (海拔135 m)、水里木材利用實習工廠 (海拔338 m)、水里 興隆國小 (海拔404 m)、清水溝樹木標本園 (海拔434 m)、溪頭有水坑 (海拔818 m)、和社松 竹梅步道 (海拔860 m)、溪頭留龍頭 (海拔1,770 m)、和社沙里仙林道 (海拔1,805 m)、塔塔加 雲杉林 (海拔2,550 m)、鐵杉林 (海拔2,694 m) 及箭竹坡地 (海拔2,706 m) 等共11處橫跨低海拔 至高海拔的不同地點架設馬氏網監測，自2016年1月起至2017年12月間，收集馬氏網內的白 蟻有翅繁殖型，藉由比較不同地點格斯特家白蟻的發生頻率、推測其擴散範圍。監測結果 一共發現37個白蟻有翅繁殖型樣本，包含3科、7屬的白蟻。入侵種格斯特家白蟻僅發生於 海拔135 m處、而其餘本土種白蟻發生於海拔135 m至860 m間，這個研究結果支持格斯特家 白蟻尚未擴散至中高海拔山區。

Coptotermes gestroi (Wasmann) is a world-wide distributed termite pest of urban areas and forests, and has established self-sustaining populations in urban areas and the lowaltitude forests of southern and central Taiwan. Coptotermes gestroi are potentially spreading to mid- and high-altitude areas and further damage Taiwanese forests. To understand the current distribution of C. gestroi, we investigated termite species composition by using Malaise traps at 11 localities of different altitudes, namely Xiaping Tropical Botanical Garden (135 m alt.), Shuili Wood Utilization Center (338 m alt.), Shuili Hsing-Lung Elementary School (404 m alt.), Qlingshuigou Arboretum (434 m alt.), Youshuikeng (818m alt.), Heshe pine-bamboo-plum trail (860 m alt.), Liulongtou (1,770 m alt.), Shalixian forest-road (1,805 m alt.), Tataka spruce forest (Picea morrisonicola) (2,550 m alt.), hemlock forest (Tsuga chinensis) (2,694 m alt.) and Yushancane meadow (Yushania niitakayamensis) (2,706 m alt.). Termite alates collected in Malaise traps were checked from January 2016 to December 2017. The distribution of C. gestroi was inferred by comparing their occurrences among different localities. With a total of 37 samples of termite alates collected, including 3 families and 7 genera, Coptotermes gestroi was found only at locality of 135 m alt., while the other species of termites were found at localities in the range of 135–860 m alt. These results indicated that C. gestroi population has not established in mountain areas of mid- and high-altitudes.