Species distribution, hybridization and connectivity in the genus Chionodraco: unveiling unknown icefish diversity in Antarctica ...

• Main Authors: Schiavon, Luca, Dulière, Valérie, La Mesa, Mario, Marino, Ilaria, Codogno, Giuditta, Boscari, Elisa, Riginella, Emilio, Battistotti, Alessandra, Lucassen, Magnus, Zane, Lorenzo, Papetti, Chiara
• Format: Dataset
• Language: English
• Published: Dryad 2020
• Subjects: Antarctic continental shelf; clustering analysis; Lagrangian modelling; Weddell Sea; Antarc*; Antarctic; Antarctic Peninsula; Antarctica; Icefish
• Online Access: https://dx.doi.org/10.5061/dryad.83bk3j9p1; https://datadryad.org/stash/dataset/doi:10.5061/dryad.83bk3j9p1

Aim The species of the genus Chionodraco (Notothenioidei) are the most abundant icefish on the continental shelf of the Weddell Sea. While previous studies indicated that only Chionodraco hamatus and Chionodraco myersi inhabit the Weddell Sea, the third Chionodraco species, Chionodraco rastrospinosus, was recently sampled in the area. Since C. rastrospinosus is supposed to be found only at the Antarctic Peninsula and Scotia Arc, this study aimed at confirming the species classification of C. rastrospinosus by molecular methods and identifying its putative source population. Given the documented evidence of introgression among the three species, we tested whether the newly found C. rastrospinosus shared any genetic variability with the other Chionodraco species. To explain the pattern of distribution of the Chionodraco species, we aimed at estimating the hydrodynamic connectivity between the Antarctic Peninsula and the Weddell Sea. Location Antarctic Peninsula, southern Scotia Arc and the south-eastern ... : Panel of 19 microsatellites loci for 564 individuals belonging to the species Chionodraco hamatus, Chionodraco myersi and Chionodraco rastrospinosus. All loci were previously characterized for the three Chionodraco species by Agostini et al. (2013). Fragment lengths were estimated by Genoscreen (www.genoscreen.fr) on a ABI PRISM 3700 DNA Analyzer (Applied Biosystems). Scoring and binning were performed by two operators, independently, with Peak Scanner ver. 1.0 (Applied Biosystem) and with the Excel macro Flexibin (Amos et al., 2007) respectively. The input files were generated with CREATE ver. 1.38 (Coombs, Letcher, & Nislow, 2008). Agostini, C., Papetti, C., Patarnello, T., Mark, F. C., Zane, L., & Marino, I. A. M. (2013). Putative selected markers in the Chionodraco genus detected by interspecific outlier tests. Polar Biology, 36(10), 1509–1518. https://doi.org/10.1007/s00300-013-1370-0 Amos, W., Hoffman, J. I., Frodsham, A., Zhang, L., Best, S., & Hill, A. V. S. (2007). Automated binning of ...