Cold-induced expression of diapause in Praon volucre: fitness cost and morpho-physiological characterization. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physiological Entomology Année : 2010

Cold-induced expression of diapause in Praon volucre: fitness cost and morpho-physiological characterization.

Résumé

Cold exposure (2 ◦C for 7 days) in constant darkness at mummy stage induces diapause expression in 9% of the Praon volucre Haliday population. Diapausing parasitoids show a significant delay in emergence time compared with nondiapausing counterparts. A diapause-mediated polyphenism is observed in mummy colour, with diapausing mummies being clearly darker than nondiapausing ones. The diapause status of dark mummies is confirmed by a significant reduction in metabolic rate. Diapausing parasitoids also display specific morphological characteristics: they are heavier (fresh and dry mass) and accumulate larger fat reserves than nondiapausing counterparts. The diapause status is associated with a fitness cost in terms of adult longevity. There is no evidence of diapause-related change in supercooling ability.

Dates et versions

hal-00596518 , version 1 (27-05-2011)

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Citer

Hervé Colinet, Frédéric Muratori, Thierry Hance. Cold-induced expression of diapause in Praon volucre: fitness cost and morpho-physiological characterization.. Physiological Entomology, 2010, 35 (4), pp.301-307. ⟨10.1111/j.1365-3032.2010.00743.x⟩. ⟨hal-00596518⟩
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