Erratum: Extraordinarily rapid life-history divergence between Cryptasterina sea star species (Proceedings of the Royal Society B: Biological Sciences (2012) 279 (3914–3922) DOI: 10.1098/rspb.2012.1343)

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We compared genetic diversity, population genetic structure and population demographic history in sister species of sea stars (Cryptasterina hystera, C. pentagona) that have evolved large differences inmating system and life-history traits [1]. Our analyses of population demographic history used the isolationwith- migration model implemented in the software application IMa2 [2,3] to fit demographic model parameters to a dataset of three loci, including mtDNA and two nuclear introns each sequenced from two population samples (one for each species). Those analyses revealed an unexpectedly short divergence time between the two species: about 6000 years.We recently discovered that a software bug in the IMa2 source code used in our analysis affects this divergence time estimate (but does not affect other results from our study).The mutation rate calibration that we initially used was especially conservative even at the time of publication, and more recent research shows that mutation rate calibrations based on older geological events may greatly underestimate mutation rates [6]. Our unpublished analyses of new Cryptasterina sequence data use the updated version of the IMa2 source code and include a faster mtDNA mutation rate calibration for a sea star (rather than sea urchins) derived from a more recent biogeographic event [7]. Those preliminary analyses return estimates of the Cryptasterina divergence time that are similar to our published divergence times and suggest that those species diverged in the Holocene. If those preliminary analyses are correct then our previously published conclusions about the tempo of life-history evolution in Cryptasterina may still be correct despite the initial inaccurate calculation.

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Proceedings of the Royal Society B: Biological Sciences