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An alternative source of time constraints in teleostean phylogeny by evaluating a …


Biology Articles » Biogeography » Mitogenomic evaluation of the historical biogeography of cichlids toward reliable dating of teleostean divergences » Conclusion

Conclusion
- Mitogenomic evaluation of the historical biogeography of cichlids toward reliable dating of teleostean divergences

We estimated the divergence times of major cichlid lineages as part of the longer evolutionary history of teleostean fishes. Our results and those of a recent molecular study based on both mitochondrial and nuclear data sets [7] support a vicariant history of cichlid divergences, while other researchers [19] have argued for the dispersal hypothesis. We presented additional strong evidence for the vicariant hypothesis and propose that the vicariant assumption can be used to generate time constraints to date other teleostean divergences in both deeper (100–300 MYA) and shallower (< 100 MYA) time ranges.

This could be a significant contribution toward the reliable dating of teleostean divergence times in light of the scarcity of teleostean fossil records in the Mesozoic and later (see above) and the probable deviation of molecular evolutionary rates of fishes from those of tetrapods [5,62], for which molecular evolutionary rates are more reliably studied using ampler fossil records. A further exploration of biogeography-based time constraints for other groups of freshwater fishes that could be reasonably incorporated into the dating study (e.g. rainbowfishes [63]) would be expected to increase the accuracy and precision of teleostean divergence time estimates.


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