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Asymmetrical positive assortative mating induced by developmental lead （Pb2＋） exposure in a model system, Drosophila melanogaster

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Current Zoology 2017年第2期63卷 195-203页

作者： Elizabeth K. PETERSON Roman YUKILEVICH Joanne KEHLBECK Kelly M. LARUE Kyle FERRAIOLO Kurt HOLLOCHER Helmut V.B. HIRSCH bernard possidente Department of Biological Sciences State University of New York at Albany Albany NY 12222 USA Department of Biology Union College Schenectady NY 12308 USA Department of Chemistry Union College Schenectady NY 12308 USA Department of Molecular Biology Princeton University Princeton NJ 08544 USA Department of Geology Union College Schenectady NY 12308 USA Department of Biology Skidmore College Saratoga Springs NY 12866 USA

Anthropogenic pollutants have the potential to disrupt reproductive strategies. Little is known about how lead （Pb2＋） exposure disrupts individual-level responses in reproductive behaviors, which are important for fitness. Drosophila melanogaster was used as a model system to deter- mine the effects of： 1） developmental lead exposure on pre-mating reproductive behaviors （i.e., mate preference）, and 2） lead exposure and mating preferences on fitness in the F0 parental generation and F1 un-exposed offspring. Wild-type strains of D. melanogaster were reared from egg stage to adulthood in control or leaded medium （250 μM PbAc） and tested for differences in： mate preference, male song performance, sex pheromone expression, fecundity, mortality, and body weight. F0 leaded females preferentially mated with leaded males （i.e., asymmetrical positive assortative mating） in 2-choice tests. This positive assortative mating was mediated by the females （and not the males） and was dependent upon context and developmental exposure to Pb. Neither the courtship song nor the sex pheromone profile expressed by control and leaded males medi- ated the positive assortative mating in leaded females. Leaded females did not incur a fitness cost in terms of reduced fecundity, increased mortality, or decreased body weight by mating with leaded males. These results suggest that sublethal exposure to lead during development can alter mate preferences in adults, but not fitness measures once lead exposure has been removed. We suggest that changes in mate preference may induce fitness costs, as well as long-term population and multi-generational implications, if pollution is persistent in the environment.

关键词： cuticular hydrocarbons positive assortative mating random mating species recognition system.

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