Reference : And if Engler was not completely wrong? Evidence for multiple evolutionary origins in th...
Scientific journals : Article
Life sciences : Genetics & genetic processes
http://hdl.handle.net/2268/22380
And if Engler was not completely wrong? Evidence for multiple evolutionary origins in the moss flora Of Macaronesia
English
Aigoin, Delphine [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Taxonomie végétale et biologie de la conservation >]
Devos, Nicolas mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Taxonomie végétale et biologie de la conservation >]
Huttunen, Sanna mailto [> >]
Ignatov, Michael mailto [> >]
Gonzalez-Mancebo, Juana mailto [> >]
Vanderpoorten, Alain mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Taxonomie végétale et biologie de la conservation >]
Dec-2009
Evolution
Society for the Study of Evolution
63
12
3248–3257
Yes (verified by ORBi)
International
0014-3820
Lawrence
KS
[en] insular endemism ; molecular dating ; morphological evolution ; bryophytes ; fossils ; Macaronesia
[en] The Macaronesian endemic flora has traditionally been interpreted as a relict of a subtropical element that spanned across Europe in the Tertiary. This hypothesis is revisited in the moss subfamily Helicodontioideae based on molecular divergence estimates derived from two independent calibration techniques either employing fossil evidence or using an Monte Carlo Markov Chain (MCMC) to sample absolute rates of nucleotide substitution from a prior distribution encompassing a wide range of rates documented across land plants. Both analyses suggest that the monotypic Madeiran endemic genus Hedenasiastrum diverged of other Helicodontioideae about 40 million years, that is, well before Macaronesian archipelagos actually emerged, in agreement with the relict hypothesis. Hedenasiastrum is characterized by a plesiomorphic morphology, which is suggestive of a complete morphological stasis over 40 million years. Macaronesian endemic Rhynchostegiella species, whose polyphyletic origin involves multiple colonization events, evolved much more recently, and yet accumulated many more morphological novelties than H. percurrens. The Macaronesian moss flora thus appears as a complex mix of ancient relicts and more recently dispersed, fast-evolving taxa.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/22380
10.1111/j.1558-5646.2009.00787.x

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