Reproductive isolation between the two forms ofPanonychus akitanus Ehara (Acarina: Tetranychidae) |
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Authors: | Tetsuo Gotoh |
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Institution: | (1) Institute of Applied Zoology, Faculty of Agriculture, Hokkaido University, Sapporo 060, (Japan);(2) Present address: Laboratory of Applied Entomology, Faculty of Agriculture, Ami, 300-03 Ibaraki, Ibaraki University, Japan |
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Abstract: | Crossing experiments were carried out between the stiped-egg form collected from Sapporo (43°04N) and Machida (35°33N), and the stipeless-egg form ofPanonychus akitanus Ehara from Tomakomai (42°37N) and Imagane (42°34N). Intra-form crosses gave a high proportion of female progeny, but inter-form crosses only male progeny, suggesting that fertilization did not take place. The number of eggs laid during the first 10 days of the oviposition period was greater in intra-form crosses than in inter-form crosses (P<0.001). The latter, except for the cross between the Sapporo and the Imagane populations, had similar egg production to virgin females (P<0.05).Mated females showed a greater daily oviposition rate than virgin females. However, the latter drastically increased their oviposition rate after mating with their sons. The two forms are thus reproductively isolated. |
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