000057918 001__ 57918
000057918 005__ 20170327111907.0
000057918 0247_ $$2doi$$a10.1186/1471-2148-14-20
000057918 0248_ $$2sideral$$a85345
000057918 037__ $$aART-2014-85345
000057918 041__ $$aeng
000057918 100__ $$aMarques, I.
000057918 245__ $$aMultiple hybridization events, polyploidy and low postmating isolation entangle the evolution of neotropical species of Epidendrum (Orchidaceae)
000057918 260__ $$c2014
000057918 5060_ $$aAccess copy available to the general public$$fUnrestricted
000057918 5203_ $$aBackground: Hybridization and polyploidy are central processes in evolution and speciation. These mechanisms often lead to complex patterns of genetic variation and the creation of novel genotypes, which may establish if they become isolated from gene flow. However, in the absence of reproductive isolation, species boundaries might easily be disrupted. Here, we used a combination of AFLPs, chloroplast DNA markers and flow cytometry to investigate the evolutionary outcomes of hybridization between two endemic Ecuadorian species of Epidendrum (E. madsenii and E. rhopalostele) in three hybrid zones. Postmating isolation was also quantified to determine the role of this barrier in restraining gene flow between hybrids and the parental species. In addition, future ecological niche models were constructed to predict the outcomes of hybridization between these species.
Results: Our results confirmed the presence of hybrids in all hybrid zones, but revealed that a third parental species (E. falcisepalum) has contributed to one of the hybrid zones studied. Backcross genotypes were frequent in all hybrid zones, which was in accordance with the absence of strong reproductive barriers. The process of hybridization was highly asymmetric and followed in some cases by polyploidy. The projection of future niche models predicted a severe reduction in the area suitable for the occurrence of these species, although favorable conditions will still occur for the existence of the current hybrid zones.
Conclusions: The recurrent process of hybridization has compromised the genetic integrity of the parental species. Most individuals of the parental species can no longer be considered as pure-bred individuals because most were classified as backcrossed hybrids. Novel genetic lineages occur in all hybrid zones implying that hybrids are fertile and can compete with the parental species. These results, together with the prediction of suitable conditions for the future occurrence of these hybrid zones, highlight the importance of conserving these geographic areas as sources of novel taxonomic entities.
000057918 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000057918 590__ $$a3.368$$b2014
000057918 591__ $$aEVOLUTIONARY BIOLOGY$$b17 / 46 = 0.37$$c2014$$dQ2$$eT2
000057918 591__ $$aGENETICS & HEREDITY$$b53 / 166 = 0.319$$c2014$$dQ2$$eT1
000057918 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000057918 700__ $$aDraper, D.
000057918 700__ $$aRiofrío, L.
000057918 700__ $$aNaranjo, C.
000057918 773__ $$g14, 20 (2014), [14 pp]$$pBMC Evol. Biol.$$tBMC EVOLUTIONARY BIOLOGY$$x1471-2148
000057918 8564_ $$s982813$$uhttps://zaguan.unizar.es/record/57918/files/texto_completo.pdf$$yVersión publicada
000057918 8564_ $$s108130$$uhttps://zaguan.unizar.es/record/57918/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000057918 909CO $$ooai:zaguan.unizar.es:57918$$particulos$$pdriver
000057918 951__ $$a2016-12-16-14:54:13
000057918 980__ $$aARTICLE