Abstract
Widespread species that are morphologically uniform may be likely to harbour cryptic genetic variation. Common ravens (Corvus corax) have an extensive range covering nearly the entire Northern Hemisphere, but show little discrete phenotypic variation. We obtained tissue samples from throughout much of this range and collected mitochondrial sequence and nuclear microsatellite data. Our study revealed a deep genetic break between ravens from the western United States and ravens from throughout the rest of the world. These two groups, the 'California clade' and the 'Holarctic clade' are well supported and over 4% divergent in mitochondrial coding sequence. Microsatellites also reveal significant differentiation between these two groups. Ravens from Minnesota, Maine and Alaska are more similar to ravens from Asia and Europe than they are to ravens from California. The two clades come in contact over a huge area of the western United States, with mixtures of the two mitochondrial groups present in Washington, Idaho and California. In addition, the restricted range Chihuahuan raven (Corvus cryptoleucus) of the south-west United States and Mexico is genetically nested within the paraphyletic common raven. Our findings suggest that the common raven may have formerly consisted of two allopatric groups that may be in the process of remerging.
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Selected References
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- Avise J. C., Wollenberg K. Phylogenetics and the origin of species. Proc Natl Acad Sci U S A. 1997 Jul 22;94(15):7748–7755. doi: 10.1073/pnas.94.15.7748. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Brown J. M., Pellmyr O., Thompson J. N., Harrison R. G. Phylogeny of Greya (Lepidoptera: Prodoxidae), based on nucleotide sequence variation in mitochondrial cytochrome oxidase I and II: congruence with morphological data. Mol Biol Evol. 1994 Jan;11(1):128–141. doi: 10.1093/oxfordjournals.molbev.a040087. [DOI] [PubMed] [Google Scholar]
- Cicero C., Johnson N. K. Molecular phylogeny and ecological diversification in a clade of New World songbirds (genus Vireo). Mol Ecol. 1998 Oct;7(10):1359–1370. doi: 10.1046/j.1365-294x.1998.00483.x. [DOI] [PubMed] [Google Scholar]
- Excoffier L., Smouse P. E., Quattro J. M. Analysis of molecular variance inferred from metric distances among DNA haplotypes: application to human mitochondrial DNA restriction data. Genetics. 1992 Jun;131(2):479–491. doi: 10.1093/genetics/131.2.479. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Fleischer R. C., McIntosh C. E., Tarr C. L. 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. doi: 10.1046/j.1365-294x.1998.00364.x. [DOI] [PubMed] [Google Scholar]
- Kocher T. D., Thomas W. K., Meyer A., Edwards S. V., Päbo S., Villablanca F. X., Wilson A. C. Dynamics of mitochondrial DNA evolution in animals: amplification and sequencing with conserved primers. Proc Natl Acad Sci U S A. 1989 Aug;86(16):6196–6200. doi: 10.1073/pnas.86.16.6196. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Melnick D. J., Hoelzer G. A., Absher R., Ashley M. V. mtDNA diversity in rhesus monkeys reveals overestimates of divergence time and paraphyly with neighboring species. Mol Biol Evol. 1993 Mar;10(2):282–295. doi: 10.1093/oxfordjournals.molbev.a040004. [DOI] [PubMed] [Google Scholar]
- Omland K. E., Lanyon S. M., Fritz S. J. A molecular phylogeny of the New World orioles (Icterus): the importance of dense taxon sampling. Mol Phylogenet Evol. 1999 Jul;12(2):224–239. doi: 10.1006/mpev.1999.0611. [DOI] [PubMed] [Google Scholar]
- Quinn T. W. The genetic legacy of Mother Goose--phylogeographic patterns of lesser snow goose Chen caerulescens caerulescens maternal lineages. Mol Ecol. 1992 Aug;1(2):105–117. doi: 10.1111/j.1365-294x.1992.tb00162.x. [DOI] [PubMed] [Google Scholar]
- Slade R. W., Moritz C. Phylogeography of Bufo marinus from its natural and introduced ranges. Proc Biol Sci. 1998 May 7;265(1398):769–777. doi: 10.1098/rspb.1998.0359. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Tarr C. L., Fleischer R. C. Population boundaries and genetic diversity in the endangered Mariana crow (Corvus kubaryi). Mol Ecol. 1999 Jun;8(6):941–949. doi: 10.1046/j.1365-294x.1999.00644.x. [DOI] [PubMed] [Google Scholar]
- Tarr C. L., Fleischer R. C. Primers for polymorphic GT microsatellites isolated from the Mariana crow, Corvus kubaryi. Mol Ecol. 1998 Feb;7(2):253–255. [PubMed] [Google Scholar]
- Tarr C. L. Primers for amplification and determination of mitochondrial control-region sequences in oscine passerines. Mol Ecol. 1995 Aug;4(4):527–529. doi: 10.1111/j.1365-294x.1995.tb00251.x. [DOI] [PubMed] [Google Scholar]
- Voelker G. Molecular evolutionary relationships in the avian genus Anthus (Pipits: Motacillidae). Mol Phylogenet Evol. 1999 Feb;11(1):84–94. doi: 10.1006/mpev.1998.0555. [DOI] [PubMed] [Google Scholar]
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