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Many aphid species exhibit a variation in reproductive mode which is influenced by winter climate regimes, with cyclical parthenogenetic (CP) lines dominating in cold winter areas (because they produce cold‐resistant eggs) and obligate parthenogenetic (OP) ones in mild winter regions (because of their parthenogenetic overwintering). Genetic studies on several aphid species have shown that the OP trait...
According to environmental-based theories on the maintenance of sexual reproduction, sexual and asexual populations may coexist if they occupy different ecological niches. The aphid Rhopalosiphum padi offers a good opportunity to test this hypothesis since sexual and asexual lineages show local coexistence during a large part of their respective life-cycles. Because these two reproductive variants...
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