Data from: Crossing the divide: admixture across the Antarctic Polar Front revealed by the brittle star Astrotoma agassizii ...

• Main Authors: Galaska, Matthew P., Sands, Chester J., Santos, Scott R., Mahon, Andrew R., Halanych, Kenneth M.
• Format: Dataset
• Language: English
• Published: Dryad 2018
• Subjects: Astrotoma agassizii; RAD; Antarctic; Southern Ocean; The Antarctic; Antarc*
• Online Access: https://dx.doi.org/10.5061/dryad.3q471; https://datadryad.org/stash/dataset/doi:10.5061/dryad.3q471

The Antarctic Polar Front (APF) is one of the most well-defined and persistent oceanographic features on the planet and serves as a barrier to dispersal between the Southern Ocean and lower latitudes. High levels of endemism in the Southern Ocean have been attributed to this barrier, whereas the accompanying Antarctic Circumpolar Current (ACC) likely promotes west-to-east dispersal. Previous phylogeographic work on the brittle star Astrotoma agassizii Lyman, 1875 based on mitochondrial genes suggested isolation across the APF, even though populations in both South American waters and the Southern Ocean are morphologically indistinguishable. Here, we revisit this finding using a high-resolution 2b-RAD (restriction-site-associated DNA) single-nucleotide polymorphism (SNP)-based approach, in addition to enlarged mitochondrial DNA data sets (16S rDNA, COI, and COII), for comparison to previous work. In total, 955 biallelic SNP loci confirmed the existence of strongly divergent populations on either side of the ... : README_AstrotomaREADME file describing the details of all uploaded dataastrotoma_94_955This is the main data matrix file, ready for downstream analyses.Astrotoma_cleaned_fastaThis file contains all sample files. All files have be checked for quality, size, and the presence of the restriction enzyme AlfI. Samples are ready for further processing through custom pipelines or through programs such as STACKS. ...