Coyne J A, Oyama R
Department of Ecology and Evolution, University of Chicago, IL 60637, USA.
Proc Natl Acad Sci U S A. 1995 Oct 10;92(21):9505-9. doi: 10.1073/pnas.92.21.9505.
Drosophila melanogaster is sexually dimorphic for cuticular hydrocarbons, with males and females having strikingly different profiles of the long-chain compounds that act as contact pheromones. Gas-chromatographic analysis of sexual mosaics reveals that the sex specificity of hydrocarbons is located in the abdomen. This explains previous observations that D. melanogaster males display the strongest courtship toward mosaics with female abdomens. We also show that males of the sibling species Drosophila simulans preferentially court D. melanogaster mosaics with male abdomens. Because the primary male hydrocarbon in D. melanogaster is also the primary female hydrocarbon in D. simulans, this supports the idea that interspecific differences in cuticular hydrocarbons contribute to sexual isolation.
黑腹果蝇的表皮碳氢化合物存在性别二态性,雄性和雌性具有截然不同的长链化合物分布,这些长链化合物充当接触性信息素。对性嵌合体的气相色谱分析表明,碳氢化合物的性别特异性位于腹部。这解释了之前的观察结果,即黑腹果蝇雄性对具有雌性腹部的嵌合体表现出最强烈的求偶行为。我们还表明,同胞物种拟果蝇的雄性优先向具有雄性腹部的黑腹果蝇嵌合体求偶。由于黑腹果蝇中的主要雄性碳氢化合物也是拟果蝇中的主要雌性碳氢化合物,这支持了表皮碳氢化合物的种间差异有助于性隔离的观点。