Marine dating network
The event that is typically used for a molecular clock calibration is a divergence of known age between two genetically distinct lineages.
However, as noted above, at the time of actual population divergence, the gene of interest was likely represented in the ancestral population by a number of divergent alleles.
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Results obtained in this study indicate that the application of this new method of AAR dating of shells has the potential to aid the geochronological investigation of shell mounds in different areas of the world.
a DNA methods for recent calibrations are not available for most marine taxa so instead we use radiometric dates for sea-level rise onto the Sunda Shelf following the Last Glacial Maximum (starting ∼18,000 years ago), which led to massive population expansions for marine species.Instead of divergence dating, we use a two-epoch coalescent model of logistic population growth preceded by a constant population size to infer a time in mutational units for the beginning of these expansion events.This model compares favorably to simpler coalescent models of constant population size, and exponential or logistic growth, and is far more precise than estimates from the mismatch distribution.Use multiple CAM50 cameras for a total view of your vessel and surroundings.