000			02815nab a22004697a 4500
003			EC-PaCDF
005			20171208110316.0
008			160906t20152015xxu|||||||||||||||||eng||
040			_aEC-PaCDF
041			_aeng
082	0	4	_222 _a597.9542177
100			_aMacLeod, Amy _95545
245	1	0	_aHybridization masks speciation in the evolutionary history of the Galápagos marine iguana.
520	0		_aThe effects of the direct interaction between hybridization and speciation—two major contrasting evolutionary processes—are poorly understood. We present here the evolutionary history of the Galápagos marine iguana (Amblyrhynchus cristatus) and reveal a case of incipient within-island speciation, which is paralleled by between-island hybridization. In-depth genome-wide analyses suggest that Amblyrhynchus diverged from its sister group, the Galápagos land iguanas, around 4.5 million years ago (Ma), but divergence among extant populations is exceedingly young (less than 50 000 years). Despite Amblyrhynchus appearing as a single long-branch species phylogenetically, we find strong population structure between islands, and one case of incipient speciation of sister lineages within the same island—ostensibly initiated by volcanic events. Hybridization between both lineages is exceedingly rare, yet frequent hybridization with migrants from nearby islands is evident. The contemporary snapshot provided by highly variable markers indicates that speciation events may have occurred throughout the evolutionary history of marine iguanas, though these events are not visible in the deeper phylogenetic trees. We hypothesize that the observed interplay of speciation and hybridization might be a mechanism by which local adaptations, generated by incipient speciation, can be absorbed into a common gene pool, thereby enhancing the evolutionary potential of the species as a whole.
546			_aEnglish
550			_a2115
653			_a Hybridization.
653			_aHibridación.
653			_aSpeciation.
653			_aEspeciación.
653			_aMasks.
653			_aMáscaras.
653			_aEvolutionary.
653			_aEvolutiva.
653			_aHistory.
653			_aHistoria.
653			_aMarine iguana.
653			_aIguana marina.
653			_aGalápagos.
700			_aRodríguez, Ariel _95564
700			_aVences, Miguel _95565
700			_aOrozco-terWengel, Pablo _95566
700			_aGarcía-Parra, Carolina _92261
700			_aTrillmich, Fritz _9293
700			_aGentile, Gabriele _9942
700			_aCaccone, Adalgisa _980
700			_aQuezada, Galo _95567
700			_aSteinfartz, Sebastian _9304
773	0		_tThe Royal Society _gVol. 282 (May 2015), p. 1-9.
856	4	0	_uhttp://dx.doi.org/10.1098/rspb.2015.0425
942			_2ddc _cARTICLE
999			_c12859 _d12859