New dates and new rates for divergence across the Isthmus of Panama
Open Access
- 7 December 1998
- journal article
- Published by The Royal Society in Proceedings Of The Royal Society B-Biological Sciences
- Vol. 265 (1412) , 2257-2263
- https://doi.org/10.1098/rspb.1998.0568
Abstract
Sister species separated by the Isthmus of Panama have been widely used to estimate rates of molecular evolution. These estimates are based on the assumption that geographic isolation occurred nearly simultaneously for most taxa, when connections between the Caribbean and eastern Pacific closed approximately three million years ago. Here we show that this assumption is invalid for the only genus for which many taxa and multiple genetic markers have been analysed. Patterns of divergence exhibited by allozymes and the mitochondrial COI gene are highly concordant for 15 pairs of snapping shrimp in the genus Alpheus, indicating that they provide a reasonable basis for estimating time since cessation of gene flow. The extent of genetic divergence between pairs of sister species varied over fourfold. Sister species from mangrove environments showed the least divergence, as would be expected if these were among the last habitats to be divided. Using this pair yields a rate of sequence divergence of 1.4% per one million years, with implied times of separation for the 15 pairs of 3 to 18 million years ago. Many past studies may have overestimated rates of molecular evolution because they sampled pairs that were separated well before final closure of the Isthmus.Keywords
This publication has 30 references indexed in Scilit:
- When oceans meet: a teleost shows secondary intergradation at an Indian–Pacific interfaceProceedings Of The Royal Society B-Biological Sciences, 1998
- Beyond area relationships: Extinction and recolonization in molecular marine biogeographyPublished by Springer Nature ,1998
- Fish Biogeography and Molecular Clocks: Perspectives from the Panamanian IsthmusPublished by Elsevier ,1997
- EVOLUTIONARY HISTORY OF NORTHERN HEMISPHERE NUCELLA (GASTROPODA, MURICIDAE): MOLECULAR, MORPHOLOGICAL, ECOLOGICAL, AND PALEONTOLOGICAL EVIDENCEEvolution, 1996
- Earliest evolution associated with closure of the Tropical American Seaway.Proceedings of the National Academy of Sciences, 1996
- Late Neogene Sedimentation Patterns in the Eastern Equatorial PacificPublished by International Ocean Discovery Program (IODP) ,1995
- Variance to Mean Ratio, R(t), for Poisson Processes on Phylogenetic TreesMolecular Phylogenetics and Evolution, 1994
- Nuclear and mitochondrial gene genealogies and allozyme polymorphism across a major phylogeographic break in the copepod Tigriopus californicus.Proceedings of the National Academy of Sciences, 1994
- Developing model systems for molecular biogeography: Vicariance and interchange in marine invertebratesPublished by Springer Nature ,1994
- Rate variation of protein and mitochondrial DNA evolution as revealed by sea urchins separated by the isthmus of Panama.Proceedings of the National Academy of Sciences, 1993