| host use evolution in chrysochus milkweed beetles: evidence from behaviour, population genetics and phylogeny. | in two sister species of leaf beetles with overlapping host associations, chrysochus auratus and c. cobaltinus, we established diet breadth and food preference of local populations for evaluation together with genetic differentiation between populations. while c. auratus turned out to be monophagous on the same plant wherever we collected the beetles, the studied populations of c. cobaltinus fed on three different plant species in the field. plant preference and ranking of the potential host pla ... | 1999 | 10447870 |
| cryptic gametic interactions confer both conspecific and heterospecific advantages in the chrysochus (coleoptera: chrysomelidae) hybrid zone. | most species pairs are isolated through the collective action of a suite of barriers. recent work has shown that cryptic barriers such as conspecific sperm precedence can be quite strong, suggesting that they evolve quickly. however, because the strength of multiple barriers has been formally quantified in very few systems, the relative speed with which conspecific sperm precedence evolves remains unclear. here, we measure the strength of both conspecific sperm precedence and cryptic non-competi ... | 2011 | 21448684 |
| initial response by a native beetle, chrysochus auratus (coleoptera: chrysomelidae), to a novel introduced host-plant, vincetoxicum rossicum (gentianales: apocynaceae). | native insects can form novel associations with introduced invasive plants and use them as a food source. the recent introduction into eastern north america of a nonnative european vine, vincetoxicum rossicum (kleopow) barbar., allows us to examine the initial response of a native chrysomelid beetle, chrysochus auratus f., that feeds on native plants in the same family as v. rossicum (apocynaceae). we tested c. auratus on v. rossicum and closely related or co-occurring native plants (apocynum sp ... | 2017 | 28398528 |
| cytonuclear disequilibrium in chrysochus hybrids is not due to patterns of mate choice. | we investigated patterns of cytonuclear disequilibrium between nuclear allozyme loci and partial mitochondrial coi and coii restriction fragment length polymorphism patterns within a population of hybridizing chrysomelid beetles and assessed to what degree the genotype frequencies of f1 hybrids were consistent with patterns of mate choice or endosymbiont infection. we document that in this population, > or = 50% of the heterospecific pairs at a given time are composed of chrysochus auratus femal ... | 2007 | 17621589 |