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CHROMOSOMAL DIVERGENCE AND SPECIATION IN TWO FAMILIES OF NORTH AMERICAN FISHES
Author(s) -
Avise John C.,
Gold John R.
Publication year - 1977
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1977.tb00975.x
Subject(s) - biology , citation , section (typography) , library science , genetic algorithm , genealogy , divergence (linguistics) , fish <actinopterygii> , evolutionary biology , history , fishery , computer science , linguistics , philosophy , operating system
Cladogenesis, or splitting, refers to the formation of independently evolving lineages from a single ancestral line. A fundamental cladogenetic process is speciation. Rates of cladogenesis vary greatly among different groups or phylads. Occasionally, rates of speciation may appear very different even among closely related phylads living in similar macroenvironments. Theoretical models have recently been proposed which predict relative levels of genetic divergence between species belonging to species-rich (speciose) versus species-poor (depauperate) phylads (Avise and Ayala, 1975). The predictions of these models depend upon the relationship between rates of speciation and amount of genetic or mdlecular divergence. The qualitative results are as follows: (1) when genetic distance between species is a function of time since they last shared a common ancestor, the mean level of genetic