期刊
ECOLOGY AND EVOLUTION
卷 2, 期 3, 页码 493-500出版社
WILEY
DOI: 10.1002/ece3.94
关键词
Bayesian-relaxed molecular clock; biogeography; Hawaii
资金
- Brazilian Research Council (CNPq) [308147/20090, 308147/2009-0]
- FAPERJ [E-26/103.136/2008, 110.838/2010, 110.028/2011]
Divergence time studies rely on calibration information from several sources. The age of volcanic islands is one of the standard references to obtain chronological data to estimate the absolute times of lineage diversifications. This strategy assumes that cladogenesis is necessarily associated with island formation, and punctual calibrations are commonly used to date the splits of endemic island species. Here, we re-examined three studies that inferred divergence times for different Hawaiian lineages assuming fixed calibration points. We show that, by permitting probabilistic calibrations, some divergences are estimated to be significantly younger or older than the age of the island formation, thus yielding distinct ecological scenarios for the speciation process. The results highlight the importance of using calibration information correctly, as well as the possibility of incorporating volcanic island studies into a formal, biogeographical hypothesis-testing framework.
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