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Calibrating the avian molecular clock
Author(s) -
WEIR J. T.,
SCHLUTER D.
Publication year - 2008
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/j.1365-294x.2008.03742.x
Subject(s) - molecular clock , biology , phylogenetic tree , evolutionary biology , molecular evolution , cytochrome b , ecology , genetics , gene
Molecular clocks are widely used to date phylogenetic events, yet evidence supporting the rate constancy of molecular clocks through time and across taxonomic lineages is weak. Here, we present 90 candidate avian clock calibrations obtained from fossils and biogeographical events. Cross‐validation techniques were used to identify and discard 16 inconsistent calibration points. Molecular evolution occurred in an approximately clock‐like manner through time for the remaining 74 calibrations of the mitochondrial gene, cytochrome b . A molecular rate of approximately 2.1% (± 0.1%, 95% confidence interval) was maintained over a 12‐million‐year interval and across most of 12 taxonomic orders. Minor but significant variance in rates occurred across lineages but was not explained by differences in generation time, body size or latitudinal distribution as previously suggested.