Phylogeny, historical biogeography, and patterns of diversification for Pinus (Pinaceae): phylogenetic tests of fossil-based hypotheses

Molecular Phylogenetics and Evolution
Andrew J Eckert, Benjamin D Hall

Abstract

Pines comprise one of the largest coniferous genera, are distributed throughout the Northern Hemisphere, and have an abundant fossil record. Distributions of fossils have been used to derive a three-step hypothesis of early pine evolution, which postulates a Mesozoic origin for the genus, east-west expansions across Laurasia, and retraction into Eocene refugia. Here, we present phylogenetic tests of this hypothesis using chloroplast sequence data from four loci for 83 pine species. We used the fossil-based hypothesis to derive null expectations concerning monophyly of taxonomic groups, dates of cladogenesis, and patterns of diversification. Phylogenetic analyses using several algorithms subsequently provided rigorous tests of these expectations. Our inferred phylogenies illustrated broad congruence with taxonomic groups, but highlighted consistent problems within subgenus Strobus. Estimated minimum dates of divergence derived from relaxed clock methods were largely consistent with the fossil record and yielded a date for the ingroup node of Pinus of 128+/-4 mya, depending upon the calibration used for subgenus Pinus. Ancestral area reconstructions showed Pinus to have most likely originated in Eurasia. Major clades differed in ...Continue Reading

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