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Genetic homogeneity and circum-Antarctic distribution of two benthic shrimp species of the Southern Ocean, Chorismus antarcticus and Nematocarcinus lanceopes

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Abstract

During the last years, molecular studies revealed significant population differentiation and cryptic species within various benthic and pelagic marine Antarctic taxa. This is unexpected due to the lack of obvious barriers to gene flow and strong current systems. Using mitochondrial (COI, 16S rDNA) and nuclear (28S rDNA: D2) gene fragments, we tested whether two circum-Antarctic benthic shrimps with planktotrophic larvae, Chorismus antarcticus and Nematocarcinus lanceopes, show patterns of regional differentiation. For both species, the 16S and the 28S fragment were invariant. However, for COI we found 24 different haplotypes for Chorismus antarcticus and 54 for Nematocarcinus lanceopes. No significant differentiation was observed among populations or regions. Furthermore, we found signatures of a population expansion in the late Pleistocene hinting at an impact of large-scale glaciations in particular on the shallow-water shrimp Chorismus antarcticus, supporting a (re)colonization and demographic expansion of this shrimp species in response to climate oscillation.

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Acknowledgments

We thank D. K. Fütterer for managing the expeditions ANT-XIX/3-4 (ANDEEP I, II), W. E. Arntz for managing ANT XXI/2, E. Fahrbach for managing ANT-XXII/3 (ANDEEP III), and R. Cattaneo-Vietti for managing the 19th expedition of the P.N.R.A. All ANDEEP expeditions were organized by A. Brandt and B. Ebbe. Additional specimens were donated from A. -N. Lörz, C. Held and C. Schubart. We thank K. Linse for providing the map, C. Greve and N. Pernat for laboratory assistance, and two anonymous reviewers for helpful comments. This work is a contribution to MarBEF (GOCE-CT-2003-505446) and is ANDEEP publication # 94. Our study was supported by the Germany Science Foundation (WA 530/28-2 to M.J.R. and RA 1688/2-1 to J.D.).

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Raupach, M.J., Thatje, S., Dambach, J. et al. Genetic homogeneity and circum-Antarctic distribution of two benthic shrimp species of the Southern Ocean, Chorismus antarcticus and Nematocarcinus lanceopes . Mar Biol 157, 1783–1797 (2010). https://doi.org/10.1007/s00227-010-1451-3

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