Geographical Distribution of Two Gall Types of Masakimyia pustulae YUKAWA & SUNOSE (Diptera, Cecidomyiidae) and Reproductive Isolation between Them by a Parasitoid

概要

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It has been known that the galls of Masakimyia pustulae can be divided into two types (the thin and thick types) according to their thickness. The geographical distribution of the two types and a reproductive isolation mechanism between them are discussed. Probable hybrids (the intermediate type) are occasionally found in the distributional boundary of the two types. In places where the two types coexist, a platygastrid adult emerges between the emergence periods of the thin and thick type adults. That is, the parasitism by the platygastrid can act as a temporal isolating factor between them. However, this is not the case when the emergence of the thick type takes place earlier than that of the platygastrid; the result is hybridization followed by the occurrence of intermediate galls. The thin type might have been displaced by the thick one in their contact zone according to the considerably high percentage parasitism of eulophids. As the thick type is distributed in three separated areas, it may have independently originated at least three times in the three areas.
日本昆虫学会の論文
1985-12-25