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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Epicuticular hydrocarbon variation in Drosophila mojavensis cluster species.
Journal of Chemical Ecology 2001 October
Epicuticular hydrocarbon variation was investigated among the three species of the Drosophila mojavensis cluster (D. mojavensis, D. arizonae, and D. navojoa) within the large D. repleta group. Because these hydrocarbons serve as contact pheromones in adult D. mojavensis, the chemical characteristics and differences in hydrocarbon profiles in populations of these three sibling species were further investigated. Twenty-seven hydrocarbon components with chain lengths ranging from C28 to C40, including n-alkanes, methyl-branched alkanes, n-alkenes, methyl-branched alkenes, and alkadienes were observed. Hydrocarbon profiles among the three species reared on different cactus hosts were easily aligned with previously identified components in D. mojavensis. Male and female D. navojoa possessed a 31-methyldotricont-6-ene absent in both D. arizonae and D. mojavensis, while lacking the 8,24-tritricontadiene present in these two species. D. navojoa adults had far less 2-methyloctacosane than these sibling species, but the significance of this difference was obscured by the degree of variation among populations in amounts of this hydrocarbon. Mainland and Baja California populations of D. mojavensis were fixed for differences in the amounts 8,24-tritricontadiene, 9,25-pentatricontadiene, and 9,27-heptatricontadiene, consistent with all previous studies. Amounts of 18 of the 27 hydrocarbon components were greater in flies reared on Opuntia cactus. Canonical discriminant function analysis resolved all three species into distinct, nonoverlapping groups, suggesting that epicuticular hydrocarbon profiles are species-specific in the D. mojavensis cluster. Based on the amounts of interpopulation variation in hydrocarbon profiles in these three species, we hypothesize that epicuticular hydrocarbon differences may evolve early during the formation of new species.
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