Translator Disclaimer
1 June 2004 CALIBRATION AGE AND QUARTET DIVERGENCE DATE ESTIMATION
Author Affiliations +
Abstract

The date of a single divergence point—between living alligators and crocodiles—was estimated with quartet dating using calibrations of widely divergent ages. For five mitochondrial sequence datasets, there is a clear relationship between calibration age and quartet estimate—quartets based on two relatively recent calibrations support younger divergence estimates than do quartets based on two older calibrations. Some of the estimates supported by young quartets are impossibly young and exclude the first appearance of the group in the fossil record as too old. The older estimates—those based on two relatively old calibrations—may be overestimates, and those based on one old and one recent calibration support divergence estimates very close to fossil data. This suggests that quartet dating methods may be most effective when calibrations are applied from different parts of a clade's history.

Christopher A. Brochu "CALIBRATION AGE AND QUARTET DIVERGENCE DATE ESTIMATION," Evolution 58(6), 1375-1382, (1 June 2004). https://doi.org/10.1554/03-509
Received: 3 September 2003; Accepted: 3 February 2004; Published: 1 June 2004
JOURNAL ARTICLE
8 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top