科研之友
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摘要
The expression of morphological disparity within a clade is related to its history and to the environmental parameters within which it develops. Recent developments in geometric morphometrics allow quantitative estimation of morphological disparity, and facilitate comparisons with genetic data intended to provide phylogenetic information. Such comparisons were made between two sets of ground beetle species from regions that differ biogeographically and environmentally: 12 post-glacial reinvading species from NE France; and 15 Japanese species less likely to be affected by the Pleistocene glacial events. Genetic relationships were inferred from mitochondrial DNA (ND5 gene). Morphological divergences among the species were analysed using Procrustes ver. 2.0, based on 64 landmarks (generalized analyses and computation of additive distance trees). The established morphospaces indicate distinct disparity patterns in France and Japan, even though the genetic data show that neither of the two sets are monophyletic, and that they are in fact intermixed in the same clade. This discrepancy is partly related to the presence of extreme (elongated) morphologies in the Japanese set. But the stronger disparity observed among Japanese species does not correspond to greater genetic differences. Those extreme morphologies appear to be related to the degree of endemicity of the species. The differences between the French and Japanese morphological patterns are discussed in the context of possible geographic factors and climatic changes during the Pleistocene.
- 出版日期2000-10
