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The pea aphid, Acyrthosiphon pisum Harris, constitutes a complex of sympatric populations that are specialised to distinct species of Fabaceae. So far, 12 such populations have been characterised genetically as genetic clusters associated with one or few legumes species. These clusters form a continuum of genetic divergence linking host‐associated races, which show moderate hybridization, to nascent...
Linking adaptive divergence to hybrid unfitness is necessary to understand the ecological factors contributing to reproductive isolation and speciation. To date, this link has been demonstrated in few model systems, most of which encompass ecotypes that occupy relatively early stages in the speciation process. Here we extend these studies by assessing how host‐plant adaptation conditions hybrid fitness...
Herbivorous insects frequently harbor bacterial symbionts that affect their ecology and evolution. Aphids host the obligatory endosymbiont Buchnera, which is required for reproduction, together with facultative symbionts whose frequencies vary across aphid populations. These maternally transmitted secondary symbionts have been particularly studied in the pea aphid, Acyrthosiphon pisum, which harbors...
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