Contrasting molecular diversity and demography patterns in two intertidal amphipod crustaceans reflect Atlantification of High Arctic
| Autor: | Jan Marcin Węsławski, Michał Grabowski, Agata Weydmann-Zwolicka, Petr Strelkov, Aleksandra Jabłońska, Mikhail Gantsevich, Maria Skazina |
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| Rok vydání: | 2019 |
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| Zdroj: | Marine Biology. 166 |
| ISSN: | 1432-1793 0025-3162 |
| DOI: | 10.1007/s00227-019-3603-4 |
| Popis: | The distribution of two common intertidal amphipod speciesGammarus oceanicusandGammarus setosuswas studied along the coast of Svalbard Archipelago. Genetic analysis showed geographical homogeneity ofG. oceanicuswith only one molecular operational taxonomic unit (MOTU) and much higher diversification ofG. setosus(5 MOTUs) in the studied area. Only two MOTUs ofG. setosusare widespread along the whole studied Svalbard coastline, whereas the remaining three MOTUs are present mainly along the northern and eastern parts of archipelago’s largest island, Spitsbergen. Distribution analysis indicates that the demographic and spatial expansion ofG. oceanicusin the northern Atlantic has started already during the Last Glacial Maximum (LGM, ca. 18 ka), whileG. setosusseems to be a long-persistent inhabitant of the Arctic, possibly even through the LGM, with slower distribution dynamics. Combining the results of our molecular study with previous field observations and the knowledge upon the direction of ocean currents around the Svalbard Archipelago, it can be assumed thatG. oceanicusis a typical boreal Atlantic species that is still continuing its postglacial expansion northwards. In recent decades it colonized High Arctic due to the climate warming and has partly displacedG. setosus, that used to be the only common gammarid of the Svalbard intertidal zone. |
| Databáze: | OpenAIRE |
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