针叶小爪螨不同种群在针叶树和阔叶树上的生长发育和繁殖及其生殖隔离

报道丁针叶小爪螨Oligonychus ununguis (Jacobi）的4个种群在针叶树和阔叶树上的生长发育和繁殖及其生殖隔离的研究结果。饲养试验证明，针叶树(杉木)种群不能在板栗、麻栎等阔叶树上存活；阔叶树(板栗、麻栎)种群也不能在杉木、黑松、赤松等针叶树上存活。交配试验证明，针叶树种群和阔叶树种群虽有交配行为，但不能正常繁衍后代，两种群间存在着明显的生殖隔离。据此认为针叶树种群和阔叶树种群有可能为两个不同种。

Performances and reproductive isolation of different populations of Oligonychus ununguis(Jacobi) on conifer and broadleaf trees

This paper deals with the growth,survival,fecundity and reproductive isolation of four Oligonychus ununguis (Jacobi)populations from different forest regions on conifer and broadleaf trees.Rearing experiments showed that the population on the conifer Cunninghamia lanceolata failed to complete its life history when raised on the broadleaf trees Castanea mollissima and Quercus acutissima. And all individuals of the populations from broadleaf trees died at nymphal stage when reared on conifers such as C.lanceolata,Pinus thunbergii and P.firma etc.Reciprocal cross tests between the populations showed that the adults originated from the population on the conifer and those from populations on the broadleaf trees did mate,but the females either did not oviposit at all or laid unfertilized eggs which only produced male nymphs,indicating the existence of reproductive isolation.These results suggest that the Oligonychus ununguis populations on conifer and broadleaf trees might consist of two different species,but not one common species as usually considered.