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Deteriorating effects of diapause duration on postdiapause life history traits in the Kanzawa spider mite

2004; Wiley; Volume: 29; Issue: 5 Linguagem: Inglês

10.1111/j.0307-6962.2004.00421.x

1365-3032

Katsura Ito,

Study of Mite Species

Abstract. The aim of this study is to clarify the deleterious effects of long‐term diapause on survival, postdiapause number of offspring and longevity in two populations of Kanzawa spider mite Tetranychus kanzawai Kishida (Acari: Tetranychidae), which were collected from Orixa japonica (Rutaceae) and Hydrangia hirta (Saxifragaceae) in Kyoto Prefecture, Japan. As the chilling period lengthens, the rate of surviving females declines more steeply in the Orixa population than the Hydrangea population. In the Orixa population, the offspring numbers of diapausing females chilled for 30 or 90 days are not significantly different from those of the parental generation, whereas they decrease to approximately one‐half that of the parental generation in the Hydrangea population. The postdiapause longevity in the 30‐ or 90‐day chilling treatments does not shorten significantly compared with that of parental generation in the Orixa population, but the longevity of the Hydrangea population declines significantly after these chilling periods. These results suggest that deteriorating effects of diapause act in a quite different manner in the two populations. A possible mechanism generating such a difference is discussed in view of trade‐off between the maintenance of body conditions and survival during hibernation.