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Environmental control of the reproductive diapause in the ragweed leaf beetle, Zygogramma suturalis F. (Coleoptera, Chrysomelidae)

100%

Vinogradova E. B., Pantuykhov G. A., Bratchikova N. Y.

Folia Biologica

1996

vol. 44

67-72

In the leaf beetle Zygogramma suturalis the photoperiodic reaction of long-day type is revealed. The photoperiod acting from the beginning of adult life affects the ratio of diapausing and reproducing females, the duration of egg maturation and the oviposition period. At 20-23 oC the short photoperiod induces the diapause in 70% of the individuals. The termination of oviposition is controlled also by short day length. Ovipositing, overwintering and non-overwintering females differ in the norm of the short-day response. The temperature corrects the dates of occurrence of autumn-winter diapause after reproduction and affects the expression of spring diapause in overwintering females.Probably in the control of the seasonal development of the leaf beetle together with the environmental factors the endogenous, spontaneous processes take part.

Adult diapause and its physiological characteristics in the rageweed leaf beetle, Zygogramma suturalis F. (Coleoptera, Chrysomelidae), introduced to Russia fron North America

88%

Vinogradova E., Pantyuchov G.

Folia Biologica

1995

vol. 43

issue 3-4

137-141

From 1984-1991 in the Stavropol territory of Russia the strategy of seasonal development was studied in the rageeed leaf beetle Zygogramma suturalis F.During the laboratory and field studies a great diversity of the female adult diapause was revealed.It differs in the time of appearance, its duration and biological significance.The incidence of diapause varies considerably in different years.Sometimes it ensures the formation of an overwintering population, and other times it changes the duration reproduction and affects the abundance of the next generation.Respiraton intensity is a significant index of the physiological state of beetles.The oxygen consumption in diapausing females is 2-5 times lower than in active reproducing ones; in young 2-6 days old beetles the highest respiration level is observed.Relatively short spring and summer diapause is characterized by the same low metabolism rate as the very long summer-winter or autumnal-winter one.The males have a higher respiration rate than females, but seasonal pattern of the male respiration resembles the female one.

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2 Folia Biologica

1 1996

1 1995

1 Bratchikova N. Y.

1 Pantuykhov G. A.

1 Pantyuchov G.

1 Vinogradova E.

1 Vinogradova E. B.

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Environmental control of the reproductive diapause in the ragweed leaf beetle, Zygogramma suturalis F. (Coleoptera, Chrysomelidae)

Adult diapause and its physiological characteristics in the rageweed leaf beetle, Zygogramma suturalis F. (Coleoptera, Chrysomelidae), introduced to Russia fron North America