Effect of Shoot Size and Phenological Variation of Host Plants on the Spatial Patterns of Cynipid Galls

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The effects of shoot size and differences in budburst phenology of Quercus serrata trees on the spatial patterns of galls were investigated for two cynipid species: the sexual generation of Andricus moriokae and the agamic generation of Aphelonyx glanduliferae. There were marked differences in budburst phenology, but these did not affect the gall density on the tree. The galls of both cynipids showed a contagious distribution in their respective trees, but different abundance patterns under high gall density. The mean number of galls of A. glanduliferae over a shoot size range was positively correlated with shoot size, More galls of A. moriokae appeared on larger shoots on trees on which many buds had started growing before oviposition by the agamic adults. In the case of a tree on which a few buds had burst by the time of oviposition, the mean numbers of A. moriokae galls on shoots of particular size ranges depended on the frequency of shoots in the size class. These results suggest that, although these cynipids prefer to attack larger shoots within a host tree, they may exhibit plasticity in their preference in response to changes in budburst phenology of the host plant relative to the time of oviposition.
一般社団法人日本森林学会の論文
2001-08-16