Colinet, Hervé
[UCL]
Muratori, Frédéric
[UCL]
Hance, Thierry
[UCL]
Cold exposure (2 degrees 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.
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Bibliographic reference |
Colinet, Hervé ; Muratori, Frédéric ; Hance, Thierry. Cold-induced expression of diapause in Praon volucre: fitness cost and morpho-physiological characterization. In: Physiological Entomology: from biochemistry to behaviour, Vol. 35, no. 4, p. 301-307 (2010) |
Permanent URL |
http://hdl.handle.net/2078.1/71077 |