Does thermal-related plasticity in size and fat reserves influence supercooling abilities and cold-tolerance in Aphidius colemani (Hymenoptera: Aphidiinae) mummies?
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| Title: | Does thermal-related plasticity in size and fat reserves influence supercooling abilities and cold-tolerance in Aphidius colemani (Hymenoptera: Aphidiinae) mummies? |
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| Authors: | Colinet, H.1 colinet@ecol.ucl.ac.be, Vernon, P.2, Hance, T.1 |
| Source: | Journal of Thermal Biology. Oct2007, Vol. 32 Issue 7/8, p374-382. 9p. |
| Subjects: | Parasitoids, Aphidius, Insects, Energy storage, Temperature |
| Abstract: | Abstract: (1) The parasitoid Aphidius colemani was reared at 15 or 25°C to induce variation in size and fat reserves; SCP and cold-tolerance were compared. Insects from both temperatures were also exposed to constant or fluctuating cold-exposure. (2) The lower SCP in mummies reared at 25°C may be partially explained by their smaller size, a negative relationship being observed between SCP and size. (3) A bimodality was observed in SCP distributions, with two modes around −26 and −22°C, likely because of presence/absence of gut content. (4) The type of exposure had a striking impact, mortality being considerably lower under fluctuating regime. (5) While energy storage is an important factor, vulnerability to chill-injury is supposed to be the primary factor regulating survival at low temperature. [Copyright &y& Elsevier] |
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| Database: | Engineering Source |
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