Gall Diversity in Guandaushi Forest Ecosystem

Ming-Yih Chen

Dept. of Botany, National Chung-Hsing University, Taichung, Taiwan 402

The Guandaushi forest ecosystem is a long-term ecological research (LTER) site in Nantou County of central Taiwan. Forty-five morphologically different insect-induced galls were found in the Guandaushi forest. A total of 27, in 16 families, out of 326 plant species contained insect-induced galls, among which 19 and 8 species were woody trees and vines, respectively. Six and 4 species of Lauraceae and Fagaceae, respectively, contained galls. Galls occurred in leaves (44.4%), stems (42.3 %), and buds (13.3 %). The insects belonged to 5 orders and 6 families which induced 19 kinds of galls. The Cecidomyiidae (Diptera) caused 9 different galls which were commonly found on Lauraceae. Psyllidae (Homoptera) caused 4 different galls. According to the classification of Küster, the percentage of prosoplasmatic galls (57.78%) was higher than kataplasmatic galls (42.22%). Based on the classification of Dreger-Jauffret, 51.11% was covering galls, 26.67% was mark galls, 13.33% was bud galls, 4.45% was pit galls, 2.22% was blister galls, and 2.22% was pitch galls. Generally, the gall-induced insects of Cecidomyiidae and Cynipidae formed covering galls and prosoplasmatic galls on leaves; the Psyllidae formed pit, blister and bud galls; the Hormaphidae formed bud galls; the Curculionidae and Lyonetiidae formed mark galls.