Testing the island effect on phenotypic diversification : insights from the Hemidactylus geckos of the Socotra Archipelago
Garcia-Porta, Joan (Institut de Biologia Evolutiva (UPF-CSIC) (Barcelona))
Šmíd, Jiří (National Museum. Department of Zoology)
Sol, Daniel (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Fasola, Mauro (Università di Pavia. Dipartimento di Scienze della Terra e dell'Ambiente)
Carranza, Salvador (Institut de Biologia Evolutiva (UPF-CSIC) (Barcelona))

Data:	2016
Resum:	Island colonization is often assumed to trigger extreme levels of phenotypic diversification. Yet, empirical evidence suggests that it does not always so. In this study we test this hypothesis using a completely sampled mainland-island system, the arid clade of Hemidactylus, a group of geckos mainly distributed across Africa, Arabia and the Socotra Archipelago. To such purpose, we generated a new molecular phylogeny of the group on which we mapped body size and head proportions. We then explored whether island and continental taxa shared the same morphospace and differed in their disparities and tempos of evolution. Insular species produced the most extreme sizes of the radiation, involving accelerated rates of evolution and higher disparities compared with most (but not all) of the continental groups. In contrast, head proportions exhibited constant evolutionary rates across the radiation and similar disparities in islands compared with the continent. These results, although generally consistent with the notion that islands promote high morphological disparity, reveal at the same time a complex scenario in which different traits may experience different evolutionary patterns in the same mainland-island system and continental groups do not always present low levels of morphological diversification compared to insular groups.
Ajuts:	Ministerio de Economía y Competitividad CGL2012-36970
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Biodiversity ; Evolutionary ecology ; Phylogenetics
Publicat a:	Scientific reports, Vol. 6 (April 2016) , art. 23729, ISSN 2045-2322

DOI: 10.1038/srep23729
PMID: 27071837

12 p, 1.4 MB

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