Altitudinal and Latitudinal Variation in Diapause Characteristics in the Spider Mite Tetranychus urticae Koch

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Variation in diapause characteristics was studied in 3 strains of the spider mite Tetrany-chus urticae Koch originating from different altitudes (0, 380 and 980m) on Mount Olympus (Northern Greece) as well as in 11 strains from different latitudes in Europe. The critical daylengths (CDLs) for diapause induction and termination were almost the same in each strain but varied according to their altitudinal and latitudinal origin. The lower the altitudinal or latitudinal origin of the strains the shorter the CDL for diapause induction and termination. In the three strains from Mount Olympus, the photoperiodic response curves for diapause termination shifted to the left when determined at progressively later times after transfer from cold storage at 4℃ to the experimental photoperiods at 19℃. This was the result of the fact that the responses to longer daylengths gradually became saturated whereas the photoperiodic maintenance of diapause by short daylengths was gradually weakened and eventually lost completely. The same has also been found for the strains originating from different latitudes in Europe. The intensity of diapause (measured as the number of days required for 50% diapause termination under LD 8 : 16 and 19℃, or the period of cold storage required for 50% diapause termination at LD 8 : 16 and 19℃) varied in relation to the altitudinal or latitudinal origin of the strains ; it increased with increasing altitude and latitude. The results show the presence of considerable variation in diapause induction and termination characteristics between strains, which is probably genetically determined and may have great adaptive significance for this wide spread species.
日本昆虫学会の論文
1999-12-25

Altitudinal and Latitudinal Variation in Diapause Characteristics in the Spider Mite Tetranychus urticae Koch

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