Age and rate of diversification of the Hawaiian silversword alliance (Compositae)

Bruce G. Baldwin, Michael Sanderson

Research output: Contribution to journalArticle

501 Citations (Scopus)

Abstract

Comparisons between insular and continental radiations have been hindered by a lack of reliable estimates of absolute diversification rates in island lineages. We took advantage of rate-constant rDNA sequence evolution and an 'external' calibration using paleoclimatic and fossil data to determine the maximum age and minimum diversification rate of the Hawaiian silversword alliance (Compositae), a textbook example of insular adaptive radiation in plants. Our maximum-age estimate of 5.2 ± 0.8 million years ago for the most recent common ancestor of the silversword alliance is much younger than ages calculated by other means for the Hawaiian drosophilids, lobelioids, and honeycreepers and falls approximately within the history of the modern high islands (≤5.1 ± 0.2 million years ago). By using a statistically efficient estimator that reduces error variance by incorporating clock-based estimates of divergence times, a minimum diversification rate for the silversword alliance was estimated to be 0.56 ± 0.17 species per million years. This exceeds average rates of more ancient continental radiations and is comparable to peak rates in taxa with sufficiently rich fossil records that changes in diversification rate can be reconstructed.

Original languageEnglish (US)
Pages (from-to)9402-9406
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume95
Issue number16
DOIs
StatePublished - Aug 4 1998
Externally publishedYes

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Asteraceae
Radiation
Islands
Modern 1601-history
Textbooks
Ribosomal DNA
Calibration

ASJC Scopus subject areas

  • General
  • Genetics

Cite this

Age and rate of diversification of the Hawaiian silversword alliance (Compositae). / Baldwin, Bruce G.; Sanderson, Michael.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 95, No. 16, 04.08.1998, p. 9402-9406.

Research output: Contribution to journalArticle

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