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Proc Biol Sci. Sep 22, 2004; 271(1551): 1881–1887.
PMCID: PMC1691815

Ice sheets promote speciation in boreal birds.

Abstract

The premise that Pleistocene ice ages played an important role in generating present-day species diversity has been challenged by genetic data indicating that most of the youngest terrestrial species on Earth coalesced long before major glacial advances. However, study has been biased towards faunas distributed at low latitudes that were not directly fragmented by advancing ice sheets. Using mitochondrial sequence divergence and a molecular clock, we compared the coalescence times of pairs of avian species belonging to superspecies complexes from the high-latitude boreal forest with those of sub-boreal and tropical avifaunas of the New World. Remarkably, all coalescence events in boreal superspecies date to the Pleistocene, providing direct evidence that speciation was commonly initiated during recent glacial periods. A pattern of endemism in boreal superspecies plausibly links the timing of divergence to the fragmentation of the boreal forest by ice sheets during the Mid- and Late Pleistocene. In contrast to the boreal superspecies, only 56% of sub-boreal and 46% of tropical superspecies members coalesced during the Pleistocene, suggesting that avifaunas directly fragmented by ice sheets experienced rapid rates of diversification, whereas those distributed farther south were affected to a lesser extent. One explanation for the absence of pre-Pleistocene superspecies in boreal avifaunas is that strong selection pressures operated in boreal refugia, causing superspecies members to achieve ecological differentiation at an accelerated rate.

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Selected References

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  • Avise JC, Walker D. Pleistocene phylogeographic effects on avian populations and the speciation process. Proc Biol Sci. 1998 Mar 22;265(1395):457–463. [PMC free article] [PubMed]
  • Avise JC, Walker D, Johns GC. Speciation durations and Pleistocene effects on vertebrate phylogeography. Proc Biol Sci. 1998 Sep 22;265(1407):1707–1712. [PMC free article] [PubMed]
  • Demboski JR, Cook JA. Phylogeography of the dusky shrew, Sorex monticolus (Insectivora, Soricidae): insight into deep and shallow history in northwestern North America. Mol Ecol. 2001 May;10(5):1227–1240. [PubMed]
  • Edwards SV, Beerli P. Perspective: gene divergence, population divergence, and the variance in coalescence time in phylogeographic studies. Evolution. 2000 Dec;54(6):1839–1854. [PubMed]
  • Fleischer RC, McIntosh CE, Tarr CL. Evolution on a volcanic conveyor belt: using phylogeographic reconstructions and K-Ar-based ages of the Hawaiian Islands to estimate molecular evolutionary rates. Mol Ecol. 1998 Apr;7(4):533–545. [PubMed]
  • Haffer J. Speciation in amazonian forest birds. Science. 1969 Jul 11;165(3889):131–137. [PubMed]
  • Huelsenbeck JP, Rannala B. Phylogenetic methods come of age: testing hypotheses in an evolutionary context. Science. 1997 Apr 11;276(5310):227–232. [PubMed]
  • Kimura M. A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequences. J Mol Evol. 1980 Dec;16(2):111–120. [PubMed]
  • Klicka J, Zink RM. Pleistocene effects on North American songbird evolution. Proc Biol Sci. 1999 Apr 7;266(1420):695–695. [PMC free article]
  • Lovette IJ, Bermingham E. Explosive speciation in the New World Dendroica warblers. Proc Biol Sci. 1999 Aug 22;266(1429):1629–1629. [PMC free article]
  • Near Thomas J, Kassler Todd W, Koppelman Jeffrey B, Dillman Casey B, Philipp David P. Speciation in North American black basses, Micropterus (Actinopterygii: Centrarchidae). Evolution. 2003 Jul;57(7):1610–1621. [PubMed]
  • Rohwer S, Bermingham E, Wood C. Plumage and mitochondrial DNA haplotype variation across a moving hybrid zone. Evolution. 2001 Feb;55(2):405–422. [PubMed]
  • Stone Karen D, Flynn Rodney W, Cook Joseph A. Post-glacial colonization of northwestern North America by the forest-associated American marten (Martes americana, Mammalia: Carnivora: Mustelidae). Mol Ecol. 2002 Oct;11(10):2049–2063. [PubMed]
  • Taberlet P, Fumagalli L, Wust-Saucy AG, Cosson JF. Comparative phylogeography and postglacial colonization routes in Europe. Mol Ecol. 1998 Apr;7(4):453–464. [PubMed]
  • Wooding S, Ward R. Phylogeography and pleistocene evolution in the North American black bear. Mol Biol Evol. 1997 Nov;14(11):1096–1105. [PubMed]
  • Yang Z. Maximum-likelihood estimation of phylogeny from DNA sequences when substitution rates differ over sites. Mol Biol Evol. 1993 Nov;10(6):1396–1401. [PubMed]
  • Zink RM, Slowinski JB. Evidence from molecular systematics for decreased avian diversification in the pleistocene Epoch. Proc Natl Acad Sci U S A. 1995 Jun 20;92(13):5832–5835. [PMC free article] [PubMed]
  • Zink Robert M, Klicka John, Barber Brian R. The tempo of avian diversification during the Quaternary. Philos Trans R Soc Lond B Biol Sci. 2004 Feb 29;359(1442):215–220. [PMC free article] [PubMed]

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