Genetic homogeneity and circum-Antarctic distribution of two benthic shrimp species of the Southern Ocean, Chorismus antarcticus and Nematocarcinus lanceopes |
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Authors: | Michael J Raupach Sven Thatje Johannes Dambach Peter Rehm Bernhard Misof Florian Leese |
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Institution: | 1. Molekularlabor, Zoologisches Forschungsmuseum Alexander Koenig, Adenauerallee 160-162, 53113, Bonn, Germany 2. Deutsches Zentrum für Marine Biodiversit?tsforschung, Südstrand 44, 26382, Wilhelmshaven, Germany 3. National Oceanography Centre, Southampton, School of Ocean and Earth Science, University of Southampton, European Way, Southampton, SO14 3ZH, UK 4. Biozentrum Grindel und Zoologisches Museum, Universit?t Hamburg, Martin-Luther-King Platz 3, 20146, Hamburg, Germany 5. Lehrstuhl für Evolutions?kologie und Biodiversit?t der Tiere, Ruhr-Universit?t Bochum, Universit?tsstra?e 150, 44801, Bochum, Germany
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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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