Literaturdatenbank
Literaturdatenbank |
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Lourenço, J. M., Glémin, S., Chiari, Y., & Galtier, N. (2013). The determinants of the molecular substitution process in turtles. Journal of Evolutionary Biology, 26(1), 38–50.
Added by: Admin (06 Jan 2014 18:24:50 UTC) |
| Resource type: Journal Article DOI: 10.1111/jeb.12031 BibTeX citation key: Loureno2013 View all bibliographic details  |
Categories: General Keywords: Chelidae, Emydidae, Emys orbicularis, Genetik - genetics, Geoemydidae, Phrynops hilarii, Rhinoclemmys punctularia, Schildkröten - turtles + tortoises Creators: Chiari, Galtier, Glémin, Lourenço Collection: Journal of Evolutionary Biology |
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| Abstract |
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Neutral rates of molecular evolution vary across species, and this variation has been shown to be related to biological traits. One of the first patterns to be observed in vertebrates has been an inverse relationship between body mass (BM) and substitution rates. The effects of three major life-history traits (LHT) that covary with BM – metabolic rate, generation time and longevity (LON) – have been invoked to explain this relationship. However, most of the theoretical and empirical evidence supporting this relationship comes from endothermic vertebrates, that is, mammals and birds, in which the environmental conditions, especially temperature, do not have a direct impact on cellular and molecular biology. We analysed the variations in mitochondrial and nuclear rates of synonymous substitution across 224 turtle species and examined their correlation with two LHT (LON and BM) and two environmental variables . Our analyses indicate that in turtles, neutral rates of molecular evolution are hardly correlated with LON or BM. Rather, both the mitochondrial and nuclear substitution rates are significantly correlated with LAT – faster evolution in the tropics – and especially so for aquatic species. These results question the generality of the relationships reported in mammals and birds and suggest that environmental factors might be the strongest determinants of the mutation rate in ectotherms. the mtDNA gene sequences of Phrynops hilarii, Emys orbicularis, Rhinoclemmys punctularia and of a Galápagos tortoise (genus Chelonoidis, taxonomy currently under revision) were added to the final sequence clusters, as well as the nuclear sequences that were available in GenBank for these species. Finally, the gene sequences for the chicken (Gallus gallus), which was used as an outgroup in our analyses, were also added to the sequence clusters.
Added by: Admin |