Dear marmammers,
I'm pleased to announce the publication of the following paper:
Cunha HA, Moraes LC, Medeiros BV, Lailson-Brito JJr, da Silva VMF, Solé-Cava
AM, Schrago CG (2011). Phylogenetic Status and Timescale for the
Diversification of Steno and Sotalia Dolphins. Plos One, v. 6, p. e28297-e28297.
The pdf is available at the journal site:
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0028297.
Alternatively, address pdf requests to [email protected].
Cheers,
Haydée
Abstract
Molecular data have provided many insights into cetacean evolution but some
unsettled issues still remain. We estimated the topology and timing of cetacean
evolutionary relationships using Bayesian and maximum likelihood analyses of
complete mitochondrial genomes. In order to clarify the phylogenetic placement
of Sotalia and Steno within the Delphinidae, we sequenced three new delphinid
mitogenomes. Our analyses support three delphinid clades: one joining Steno and
Sotalia (supporting the revised subfamily Stenoninae); another placing Sousa
within the Delphininae; and a third, the Globicephalinae, which includes
Globicephala, Feresa, Pseudorca, Peponocephala and Grampus. We also conclude
that Orcinus does not belong in the Globicephalinae, but Orcaella may be part
of that subfamily. Divergence dates were estimated using the relaxed molecular
clock calibrated with fossil data. We hypothesise that the timing of separation
of the marine and Amazonian
Sotalia species (2.3 Ma) coincided with the establishment of the modern Amazon
River basin.
~~~~~~~~~~~~~~~~~~~~
Haydée A. Cunha, PhD
Laboratório de Biodiversidade Molecular (UFRJ)/
MAQUA - Laboratório de Mamíferos Aquáticos e Bioindicadores (UERJ)
Dept. de Genética, Inst. de Biologia
Universidade Federal do Rio de Janeiro - UFRJ
CCS, Bloco A, Sl. A2-098.
Ilha do Fundão, Rio de Janeiro, RJ. Brasil.
+55 21 2562-6389/2334-0065/9981-8382
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