Peatmoss (Sphagnum) diversification associated with Miocene Northern Hemisphere climatic cooling?

Journal Article

Global climate changes sometimes spark biological radiations that can feed back to effect significant ecological impacts. Northern Hemisphere peatlands dominated by living and dead peatmosses (Sphagnum) harbor almost 30% of the global soil carbon pool and have functioned as a net carbon sink throughout the Holocene, and probably since the late Tertiary. Before that time, northern latitudes were dominated by tropical and temperate plant groups and ecosystems. Phylogenetic analyses of mosses (phylum Bryophyta) based on nucleotide sequences from the plastid, mitochondrial, and nuclear genomes indicate that most species of Sphagnum are of recent origin (ca. <20 Ma). Sphagnum species are not only well-adapted to boreal peatlands, they create the conditions that promote development of peatlands. The recent radiation that gave rise to extant diversity of peatmosses is temporally associated with Miocene climatic cooling in the Northern Hemisphere. The evolution of Sphagnum has had profound influences on global biogeochemistry because of the unique biochemical, physiological, and morphological features of these plants, both while alive and after death.

Full Text

Duke Authors

Cited Authors

  • Shaw, AJ; Devos, N; Cox, CJ; Boles, SB; Shaw, B; Buchanan, AM; Cave, L; Seppelt, R

Published Date

  • June 2010

Published In

Volume / Issue

  • 55 / 3

Start / End Page

  • 1139 - 1145

PubMed ID

  • 20102745

Electronic International Standard Serial Number (EISSN)

  • 1095-9513

Digital Object Identifier (DOI)

  • 10.1016/j.ympev.2010.01.020

Language

  • eng

Conference Location

  • United States