title: Two pulses of diversification across the Isthmus of Tehuantepec in a montane Mexican bird fauna.
abstract: Understanding the evolutionary history of the species in a particular region provides insights into how that fauna was formed. Of particular interest to biogeographers is examining the impact a geographical barrier had in generating temporal genetic diversity among codistributed species. We examined the impact a major New World barrier, the Isthmus of Tehuantepec (IT) in southern Mexico, had on a regional bird fauna. Specifically, genetic data from 10 montane-forest bird taxa were analysed using approximate Bayesian computation (ABC) to test the hypothesis of simultaneous intraspecific diversification at the IT. Because effective population size (N(e)) has the greatest impact on coalescent times, thereby affecting tests of divergence among codistributed taxa, we chose priors for both current and ancestral N(e) using empirical estimates of theta. The ABC method detected two discrete diversification events. Subsequent analysis with the number of diversification events constrained to two suggests that four taxa diverged in an older event, with the remaining six diverging more recently. Application of a range of mutation rates from 2.0 to 5.0% Myr(-1) places both events within the Pleistocene or Late Pliocene, suggesting that fluctuations in montane habitat induced by climate cycles and a late Pliocene seaway may have fractured this montane bird fauna. The results presented here suggest this avian fauna responded in a relatively concerted fashion over the last several million years.
authors.affiliation: Department of Ornithology, American Museum of Natural History, New York, NY 10024, USA. brbarber76@gmail.com
authors.forename: B R
authors.initials: BR
authors.lastname: Barber
authors.forename: J
authors.initials: J
authors.lastname: Klicka
mesh_terms: D000818:Animals; D001499:Bayes Theorem; D044822:Biodiversity; D001717:Birds / Q000235:genetics* / Q000502:physiology; D051456:Gene Flow; D049810:Genetic Speciation; D005843:Geography; D008800:Mexico; D009245:NADH Dehydrogenase / Q000737:chemistry / Q000235:genetics; D010802:Phylogeny; D011156:Population Density; D017422:Sequence Analysis, DNA; D012934:Social Isolation
chemical_list: D009245:NADH Dehydrogenase
references.citation: Theor Popul Biol. 1975 Apr;7(2):256-76
references.pmid: 1145509
references.citation: Philos Trans R Soc Lond B Biol Sci. 2004 Feb 29;359(1442):215-9; discussion 219-20
references.pmid: 15101578
references.citation: Genetics. 2004 Jun;167(2):747-60
references.pmid: 15238526
references.citation: Am Nat. 2000 Jun;155(6):755-768
references.pmid: 10805642
references.citation: PLoS Biol. 2006 May;4(5):e88
references.pmid: 16683862
references.citation: Mol Phylogenet Evol. 2008 Apr;47(1):21-35
references.pmid: 18272405
references.citation: Mol Phylogenet Evol. 2004 Oct;33(1):186-96
references.pmid: 15324847
references.citation: Evolution. 2006 Feb;60(2):370-82
references.pmid: 16610327
references.citation: Nat Rev Genet. 2002 May;3(5):380-90
references.pmid: 11988763
references.citation: Genetics. 2002 Dec;162(4):2025-35
references.pmid: 12524368
references.citation: Mol Ecol. 2006 Jan;15(1):209-23
references.pmid: 16367841
references.citation: Proc Biol Sci. 1998 Sep 22;265(1407):1707-12
references.pmid: 9787467
references.citation: Science. 2005 Nov 25;310(5752):1293-8
references.pmid: 16311326
references.citation: Mol Phylogenet Evol. 1996 Apr;5(2):368-82
references.pmid: 8728395
references.citation: Science. 1999 Aug 20;285(5431):1265-7
references.pmid: 10455053
references.citation: Mol Ecol. 2008 May;17(10):2321-8
references.pmid: 18422932
references.citation: Nature. 2000 Jun 22;405(6789):907-13
references.pmid: 10879524
references.citation: Mol Ecol. 2002 Dec;11(12):2623-35
references.pmid: 12453245
references.citation: Mol Ecol. 2007 Feb;16(3):619-27
references.pmid: 17257117
references.citation: PLoS Biol. 2005 Jun;3(6):e193
references.pmid: 15898833
references.citation: BMC Bioinformatics. 2007 Jul 26;8:268
references.pmid: 17655753
references.citation: Mol Phylogenet Evol. 2007 Sep;44(3):993-1016
references.pmid: 17275342
references.citation: Genetics. 2007 Jan;175(1):155-65
references.pmid: 16510781
references.citation: Evolution. 2006 May;60(5):1004-13
references.pmid: 16817540
references.citation: BMC Evol Biol. 2007 Nov 08;7:214
references.pmid: 17996036
references.citation: Genetics. 1983 Oct;105(2):437-60
references.pmid: 6628982
references.citation: Evolution. 1989 Sep;43(6):1192-1208
references.pmid: 28564500
references.citation: Mol Phylogenet Evol. 2005 Nov;37(2):511-28
references.pmid: 15935704
references.citation: J Evol Biol. 2004 Jan;17(1):1-10
references.pmid: 15000642
references.citation: Genetics. 2002 Jul;161(3):1307-20
references.pmid: 12136032
references.citation: Mol Phylogenet Evol. 2008 Jul;48(1):1-11
references.pmid: 18486493
references.citation: Evolution. 2000 Dec;54(6):1839-54
references.pmid: 11209764
references.citation: Proc Biol Sci. 2004 Sep 22;271(1551):1881-7
references.pmid: 15347509
references.citation: Integr Comp Biol. 2002 Nov;42(5):953-9
references.pmid: 21680375
references.citation: Evolution. 2004 Mar;58(3):670-5
references.pmid: 15119452