|Publication Type:||Journal Article|
|Year of Publication:||1994|
|Authors:||M. S. Hafner, Sudman, P. D., Villablanca, F. X., Spradling, T. A., Demastes, J. W., Nadler, S. A.|
|Pagination:||1087 - 1090|
|Keywords:||base, differentiation, genetic, genome, geomydoecus, Geomyidae, gopher, Mallophaga, mitochondrial dna, Phylogeny, pocket, rodentia, substitutions, trees, trichodectidae|
DNA sequences for the gene encoding mitochondrial cytochrome oxidase I in a group of rodents (pocket gophers) and their ectoparasites provide evidence for cospeciation and reveal different rates of molecular evolution in the hosts and their parasites. The overall rate of nucleotide substitution (both silent and replacement changes) is approximately three times higher in lice, and the rate of synonymous substitution (based on analysis of fourfold degenerate sites) is approximately an order of magnitude greater in lice. The difference in synonymous substitution rate between lice and gophers correlates with a difference in similar magnitude in generation times.
Disparate rates of molecular evolution in cospeciating hosts and parasites