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|Title:||Uncoupling ecological innovation and speciation in sea snakes (Elapidae, Hydrophiinae, Hydrophiini)|
|Citation:||Journal of Evolutionary Biology, 2010; 23(12):2685-2693|
|Publisher:||Blackwell Publishing Ltd|
|K. L. Sanders, Mumpuni & M. S. Y. Lee|
|Abstract:||The viviparous sea snakes (Hydrophiini) are by far the most successful living marine reptiles, with ∼ 60 species that comprise a prominent component of shallow-water marine ecosystems throughout the Indo-West Pacific. Phylogenetically nested within the ∼ 100 species of terrestrial Australo-Melanesian elapids (Hydrophiinae), molecular timescales suggest that the Hydrophiini are also very young, perhaps only ∼ 8-13 Myr old. Here, we use likelihood-based analyses of combined phylogenetic and taxonomic data for Hydrophiinae to show that the initial invasion of marine habitats was not accompanied by elevated diversification rates. Rather, a dramatic three to six-fold increase in diversification rates occurred at least 3-5 Myr after this transition, in a single nested clade: the Hydrophis group accounts for ∼ 80% of species richness in Hydrophiini and ∼ 35% of species richness in (terrestrial and marine) Hydrophiinae. Furthermore, other co-distributed lineages of viviparous sea snakes (and marine Laticauda, Acrochordus and homalopsid snakes) are not especially species rich. Invasion of the oceans has not (by itself) accelerated diversification in Hydrophiini; novelties characterizing the Hydrophis group alone must have contributed to its evolutionary and ecological success.|
|Keywords:||diversification rate; Hydrophiini; phylogenetic analysis; sea snakes.|
|Rights:||© 2010 The Authors. Journal Compilation © 2010 European Society For Evolutionary Biology|
|Appears in Collections:||Earth and Environmental Sciences publications|
Environment Institute publications
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