Homoplasious colony morphology and mito-nuclear phylogenetic discordance among Eastern Pacific octocorals

 

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Autores: Ament Velásquez, Sandra L., Breedy Shadid, Odalisca, Cortés Núñez, Jorge, Guzmán, Héctor M., Wörheide, Gert, Vargas, Sergio
Formato: artículo original
Fecha de Publicación:2016
Descripción:Octocorals are a diverse and ecologically important group of cnidarians. However, the phylogenetic relationships of many octocoral groups are not well understood and are based mostly on mitochondrial sequence data. In addition, the discovery and description of new gorgonian species displaying unusual or intermediate morphologies and uncertain phylogenetic affinities further complicates the study of octocoral systematics and raises questions about the role played by processes such as plasticity, crypsis, and convergence in the evolution of this group of organisms. Here, we use nuclear (i.e. 28S rDNA) and mitochondrial (mtMutS) markers and a sample of Eastern Pacific gorgonians thought to be remarkable from a morphological point of view to shed light on the morphological diversification among these organisms. Our study reveals the loss of the anastomosed colony morphology in two unrelated lineages of the seafan genus Pacifigorgia and offers strong evidence for the independent evolution of a whip-like morphology in two lineages of Eastern Pacific Leptogorgia. Additionally, our data revealed one instance of mito-nuclear discordance in the genera Leptogorgia and Eugorgia, which may be the results of incomplete lineage sorting or ancient hybridization-introgression events. Our study stresses the importance of comprehensive taxonomic sampling and the use of independent sources of evidence to address the phylogenetic relationships and clarifying the evolution of octocorals.
País:Kérwá
Institución:Universidad de Costa Rica
Repositorio:Kérwá
OAI Identifier:oai:https://www.kerwa.ucr.ac.cr:10669/73427
Acceso en línea:http://www.sciencedirect.com/science/article/pii/S1055790316000671?via%3Dihub
https://hdl.handle.net/10669/73427
Access Level:acceso abierto
Palabra clave:Molecular systematics
Octocorals
Eastern Pacific
Mito-nuclear discordance
Colony morphology
Homoplasy