British Insects and Trees: A Study in Island Biogeography or Insect/Plant Coevolution?

Abstract
Evidence suggested that the numbers of associated insect species were closely correlated with the recent abundance of their host plants. Neither the geological time theory nor the species-area theory explained the relative numbers of species of mesophyll-feeding leafhoppers (Cicadellidae) on British trees. Coevolutionary interactions might be the most important factors determining the patterns of insect-plant relationships in diverse plant communities.