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Reproductive cycles of ips typographus ips amitinus and pityogenes chalcographus coleoptera scolytidae

Reproductive cycles of ips typographus ips amitinus and pityogenes chalcographus coleoptera scolytidae

Acta Entomologica Bohemoslovaca 78(5): 280-289

Histological changes of ovaries and testes and fecundity of the bark beetles I. typographus, I. amitinus and P. chalcographus were investigated under laboratory conditions. Although development of the gonads is completed in adults before feeding starts, the terminal phases of gametogenesis (spermateliosis, vitellogenesis) occur during maturation feeding. Forming of vitellarium and egg production is repeated during regeneration feeding in females. There are 3 reproductive cycles in I. typographus, which inhabits warm localities at lower altitudes, living on the lower [tree] stem portion below the crown. Two cycles occur in I. amitinus inhabiting relatively cold mountain localities and the same host-plant niche as I. typographus, and a single reproduction in P. chalcographus which inhabits both lowland and mountain localities but colonizes a different niche (spruce branches). Fecundity of these species is 30-50 eggs/reproductive cycle. Different types of reproductive strategies are discussed.

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Accession: 006316724

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