Parasitism in Acorns of Cyclobalanopsis glaucoides and Castanopsis delavayi (Fagaceae) and Its Impact on Population Regeneration

doi:10.7677/ynzwyj201413242

Abstract

Abstract:

Insect predation on oak trees played an important role in population regeneration and seed dispersal. Insect infestation on the acorns of Cyclobalanopsis glaucoides and Castanopsis delavayi were compared between the plots at different slope position in two years at Xishan Mountain, Kunming, China. We established three plots for each tree species to observe seed rain and to collect seeds from early September to late November, covering whole seed falling season. The results showed: 1) Parasitic insects in Cyglaucoides acorns were Curculio megadens Pelsue and Zhang and Curculio sp. Within Cadelavayi acorns, they were Curculio sp. and Cyllorhynchites sp. 2) Infestation rates of Cyglaucoides were not significantly changed among plots (2484%~2760%) and in two years (2547% in 2005, and 2711% in 2006). In contrast, there were significant spatial and temporal variation for Cadelavayi, 1794%~2655% among plots, and 2669% in 2005, and 1690% in 2006. 3) Weevilinfested acorns were heterogeneous in falling time. Infestation rate reduced gradually among the falling acorns, and there were two peaks of weevilinfested acorns, middle to late September and middle to late October. Retention time of larvae inside the fallen acorns of Cyglaucoides was longer than in Cadelavayi’s. 4) Seedling recruitment may be related to insect predation. However, the weevil infestation rate was not significant related to the seedlings density among plots. There were more seedlings around big trees and at sites with higher herb coverage.

Key words: Cyclobalanopsis glaucoides, Castanopsis delavayi, Weevil, Infestation rate, Seedling recruitment

CLC Number:

Q 948

WANG Chong-Yun, ZHU Feng, ZHANG Zhi-Ying, HE Zhao-Rong, LI Xiao-Shuang. Parasitism in Acorns of Cyclobalanopsis glaucoides and Castanopsis delavayi (Fagaceae) and Its Impact on Population Regeneration[J]. Plant Diversity, 2014, 36(05): 629-638.

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