Reconciling deep calibration and demographic history: Bayesian inference of post glacial colonization patterns in Carcinus aestuarii (Nardo, 1847) and C. maenas (Linnaeus, 1758)

A precise inference of past demographic histories including dating of demographic events using Bayesian methods can only be achieved with the use of appropriate molecular rates and evolutionary models. Using a set of 596 mitochondrial cytochrome c oxidase I (COI) sequences of two sister species of E...

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Bibliographic Details
Published in:PLoS ONE
Main Authors: Marino I. A. M., Pujolar J. M., Zane L.
Other Authors: Marino, I. A. M., Pujolar, J. M., Zane, L.
Format: Article in Journal/Newspaper
Language:English
Published: PUBLIC LIBRARY SCIENCE 2011
Subjects:
POPULATION-STRUCTURE
TIME DEPENDENCY
MITOCHONDRIAL PHYLOGEOGRAPHY
MEDITERRANEAN SEA
GENETIC-STRUCTURE
MOLECULAR-RATES
ICE-SHEET
DIVERGENCE
EVOLUTION
MODEL
Ice Sheet
Online Access:https://hdl.handle.net/11577/3493667
https://doi.org/10.1371/journal.pone.0028567
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0028567
Description
Summary:A precise inference of past demographic histories including dating of demographic events using Bayesian methods can only be achieved with the use of appropriate molecular rates and evolutionary models. Using a set of 596 mitochondrial cytochrome c oxidase I (COI) sequences of two sister species of European green crabs of the genus Carcinus (C. maenas and C. aestuarii), our study shows how chronologies of past evolutionary events change significantly with the application of revised molecular rates that incorporate biogeographic events for calibration and appropriate demographic priors. A clear signal of demographic expansion was found for both species, dated between 10,000 and 20,000 years ago, which places the expansions events in a time frame following the Last Glacial Maximum (LGM). In the case of C. aestuarii, a population expansion was only inferred for the Adriatic-Ionian, suggestive of a colonization event following the flooding of the Adriatic Sea (18,000 years ago). For C. maenas, the demographic expansion inferred for the continental populations of West and North Europe might result from a northward recolonization from a southern refugium when the ice sheet retreated after the LGM. Collectively, our results highlight the importance of using adequate calibrations and demographic priors in order to avoid considerable overestimates of evolutionary time scales.

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