Patterns of evolution and multidimensional systematics in graylings (Lepidoptera: Hipparchia)

Abstract

The difficult and controversial attribution of Hipparchia (Parahipparchia) populations to species or subspecies rank led us to use a comparative, quantitative approach to clarify evolutionary and taxonomic relationships among taxa. Seventeen populations from the Mediterranean area belonging to nine presumptive species or subspecies were sampled, and multivariate analyses were employed to study three character sets: allozymes, morphometric profiles of male genitalia, and quantitative descriptors of wing pattern and shape. Comparative analyses of distance matrices, trees and ordination patterns enabled us to outline evolutionary relationships among taxa and to assess the relative value of each character set. Congruent relationships among taxa were obtained from allozymes and male genital morphometries, suggesting that divergence in genital morphology is a fairly good marker of the overall genetic divergence. On the other hand, discordant results from wing pattern descriptors suggest these might be subjected to different evolutionary trajectories and rates because of their particular adaptive significance, and might not represent reliable tracers of phylogeny.