(NAS Colloquium) Genetics and the Origin of Species From Darwin to Molecular Biology 60 Years After Dobzhansky (1997) / Chapter Skim
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Incipient species formation in salamanders of the Ensatina complex
Incipient species formation in salamanders of the Ensatina complex
Pages 71-77
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From page 71... ...
Tbe~ is evidence of ~ north to south rouge expansion along No a^` ~kb secondary contact and coma ple{ion ofibe ringin southern Ca11~rn1~. Current research targets regions once tbougb1 ~ sb~primaryinterprndation, bu1~hich molecular markers revea1 ~ tee zones ofsecoudary contact Here empbas~isontbesubspec~sF.~.~p~Z~, bichislnvolvedin ~urdis1inct secondary con1uctsincentra1 Cali~rnia.lbereisevldenceof reneged geneficinterat1ious upon recontacC gab greater genetic dintrentlatiou Tidbit than between it and some of the interacOng populaGons.lbe complex p~sentsaf~liarr4yoflu~rmed~ ~ conditions between ~ell-marked species and p~eogra~pbi>~!
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From page 72... ...
. Periods of s~parabon and di#~nlisdon wed Obeyed to ha beck Allied ~ secondary contacty Tab resumption of gene flow.
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From page 73... ...
~ . ~ gc~cdc connection benison 1bc North Bay and South BY appears to be via the East Bay; San Franc~co Bay an)
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From page 74... ...
range of ~, in the bias immediately north of Santa Rosa and on the ~s1 side of tbc valley that separates Tess bills Ram the main Coast Range near Fores~iHe. ID the first area tbree popul~dons wore sampled Mom nearly contlnnous babbat near Mark Wag Creak.
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From page 75... ...
DiD>rcntialion ~ archer than originally emit oned,andth~reisevid~ncc1hrougbouttb~ dng ofsubdDi~on.di~trentiation.~ndsevcr~lreconlacts.N~varthC}ess^tbC com Jex dispirit ~1u~ offs rye scrips ofinteract~g unity In the nodh boundaries be apparently old units bave been ob ~ red by document gong Pow and distant ch~raclersets do notcoiscidc gcogr~phically;as oar moves south Me unbsb~comc mom di~lnctand datasetsarc more coordinated.In regions of secondary contacting the Sierra Nevada and southern C~hforn~,clear bybridLaJon occur; altlloUgEh~ybrids{~ndl>~cEcrossesarcb~allllyaDd:~rti~le,lbe~ro happa~nt~seTecLona~ainsttbem (14~.Eh~here ~ 1her~g tbeF~isnoun~mb~uousevidenceothybUdiz~hon.by~hich1 mean ~ Papacy and production ofo~Spr~ Mom mating of unlike ~rms,butthe~ isevidence of~enet~ sdmbJu~ and introgrossion between gcopraphTcally adjacent units. usually with morc gcnctic dif:~>re~ntiat~ioll within]
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From page 76... ...
as saloon horc, there arc lead borders with nei~bboring tag and ~ remains uncle if the lava arc mewing OF continuing 10 diverge. Fu~hcrmore, there is a broad overlap in comparison of Rabin and bel~een talon genetic distances, so that genetic distances are mad greater alibis ~~~ than IBM arc boolean Lana in tbo zones of secondary contact according, lacks interim as ~ historical un)
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From page 77... ...
? ~799 ~7767 dation.and mu~TpIc rccontacls(F~.7~.In eOtct.thcre rings~lthlnrin~sintbisco~plex,resullin~ Mom manylcvels otbistory being msni~stin a single comp~catod pattern of variation,~xpressed som~ba1diD>rently ~tlLc1breclevels inves6~atod to date- DNA s~quences,alTozymes.and color patte=.\VhiletbocompTex~pp~arstoLcinas1~1eofincipient species formation, ~bicb makes taxonomy problematic.
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