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Roderick, G.K. and Metz, E.C., 1997. Biodiversity of planthoppers (Hemiptera: Dclphacidae) on the Hawaiian silversword alliance: effects of host plant phytogeny and hybridisation. Memoirs of the Museum of Victoria 56(2): 393-399. Many hypotheses have been advanced to account for the biodiversity of herbivorous insects. Here we test whether the diversity of a group of planthoppers, genus Nesoxydnc (Hemiptera: Delphacidae), can be explained by the history and patterns of hybridisation of their host plants in the Hawaiian silversword alliance, many of which arc critically endangered or threatened. Molecular data (DNA sequences of mitochondrial cytochrome oxidase I) for planthoppers examined to date reveals significant co-speciation between these insects and their hosts. Nesosydne planthoppers are highly host specific with each species feeding on only one plant species or on closely related species that hybridise. There was no evidence to support the "hybrid-bridge" hypothesis as a mechanism by which herbivorous insects may switch hosts. Nor was there evidence that plant hybrid zones were centres of insect biodiversity. Rather, patterns of host plant use within plant hybrid zones suggests that planthopper diversification follows host plant diversification.

Biodiversity of planthoppers (Hemiptera: Delphacidae) on the Hawaiian silversword alliance: effects of host plant phylogeny and hybridization