[MARMAM] New paper on the phylogeny of the subfamily Delphininae

Ana Rita Amaral aramaral at fc.ul.pt
Tue May 8 08:30:41 PDT 2012

Dear colleagues,

I would like to inform you that the following paper was recently published:

Amaral AR, Jackson JA, Möller LM, Beheregaray LB (2012) Species tree of a recent radiation: The subfamily Delphininae (Cetacea, Mammalia). Molecular Phylogenetics and Evolution 64: 243-253.

Lineages undergoing rapid radiations provide exceptional opportunities for studying speciation and adaptation, but also represent a challenge for molecular systematics because retention of ancestral polymorphisms and the occurrence of hybridization can obscure relationships among lineages. Dolphins in the subfamily Delphininae are one such case. Non-monophyly, rapid speciation events, and discordance between morphological and molecular characters have made the inference of phylogenetic relationships within this subfamily very difficult. Here we approach this problem by applying multiple methods intended to estimate species trees using a multi-gene dataset for the Delphininae (Sousa, Sotalia, Stenella, Tursiops, Delphinus and Lagenodelphis). Incongruent gene trees obtained indicate that incomplete lineage sorting and possibly hybridization are confounding the inference of species history in this group. Nonetheless, using coalescent-based methods, we have been able to extract an underlying species-tree signal from divergent histories of independent genes. This is the first time a molecular study provides support for such relationships. This study further illustrates how methods of species-tree inference can be very sensitive both to the characteristics of the dataset and the evolutionary processes affecting the evolution of the group under study.

Abstract link: http://www.sciencedirect.com/science/article/pii/S105579031200142X

For pdf requests or additional information please contact: aramaral at fc.ul.pt.


Ana Rita Amaral

Ana Rita Amaral, PhD
Postdoctoral Researcher

Sackler Institute for Comparative Genomics
American Museum of Natural History
Central Park West at 79th Street
New York, NY 10024 USA

Centre for Environmental Biology
Faculty of Sciences University of Lisbon
Campo Grande 1749-016 Lisbon, Portugal

E-mail: aramaral at fc.ul.pt

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