Monday, 15 November 2004 - 11:18 AM
0115

Modification of cuticular hydrocarbon (CHC) composition in the black imported fire ant, Solenopsis richterii, at different ambient temperatures

Jake R. Marquess, jrmarque@olemiss.edu and James B. Anderson, Andersn@olemiss.edu. University of Mississippi, CWWR/UMFS, 15 Road 2078, Abbeville, MS

The relationship between ambient rearing temperature and the melting point of cuticular lipids in California grasshoppers was studied by Gibbs et al. (1991), with the conclusion that the CHC melting points of grasshoppers raised in summer conditions were higher than fall-reared siblings. Woodrow, et al. (2000) found similar results with the termite, Cryptotermes brevis, noting that longer branched alkanes were present at higher ambient temperatures thus increasing the melting point. We investigated the ability of the black imported fire ant, Solenopsis richterii, to modify cuticular hydrocarbon (CHC) composition at different temperature regimes. Ten colonies were subjected to lower temperatures and the cuticular hydrocarbon composition was assessed before placement in the environmental chamber and at 1,8,24,72 and 168 hours after placement. Body and head capsule samples were analyzed using a Hewlett Packard 6850 gas chromatographer. Results suggest that S. richterii can adjust its cuticular hydrocarbon composition when presented with different temperature ranges.


Species 1: Hymenoptera Formicidae Solenopsis richterii (Black imported fire ant (BIFA))
Keywords: cuticular hydrocarbons (CHC), ambient temperature

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