Diversification of host use in two polyphagous butterflies: differences in oviposition specificity or host rank hierarchy? (original) (raw)

Entomologia Experimentalis et Applicata, 2007

Abstract

Novel host usage may represent an initial step towards diversification or radiation onto novel hosts within an evolutionary lineage, particularly if a shift in host plant preference ranking takes place. Polyphagous stages of evolutionary lineages may represent transitional states in which novel host associations are more likely to develop, but may be more difficult to detect experimentally. The polyphagous sister species Papilio glaucus L. and Papilio canadensis (Lepidoptera: Papilionidae; these Papilio = Pterourus) are known to exhibit differences in host‐plant use, despite significant overlap in host‐use abilities, providing an opportunity to examine how host shifts in polyphagous species may occur and what the implications for future divergence may be. In particular, we were interested in (i) determining whether differences in oviposition behavior of these species were due to changes in specificity or shifts in host‐plant hierarchy, (ii) whether the varying preference for primary...

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