TY - JOUR N2 - The coexistence of two congeneric amphipods, boreal Gammarus oceanicus, and arctic G. setosus, was studied during the summer seasons of 2017-2019 in the region of Isfjorden, Forlandsundet, and Prins Karl Forland island in the west-central part of the Svalbard archipelago (Arctic). Across the study area species distribution often overlapped, but the domination patterns mirrored environmental conditions preferred by each species. Both species, however, were able to survive in suboptimal conditions. On a small spatial scale (in one sample) the species were separated, which may suggest an antagonistic relationship between them. The ongoing changes in the environment of Svalbard will likely affect these two species differently. The increasing intrusion of Atlantic waters will probably favor the further expansion of G. oceanicus along the Svalbard coasts. This will be due to the gradual advance of the existing population, as an influx of individuals from the Nordic seas seems unlikely. G. setosus will remain the dominant species in cold-water areas such as the inner fjords and the northeastern coast of Svalbard and may find new suitable habitats in lagoons or estuaries fed by melting glaciers. Despite predicted changes in the distribution range of both species, their future coexistence should still be possible due to the wide range of environmental tolerance and the heterogeneity of the Svalbard coastal habitats. L1 - http://journals.pan.pl/Content/120613/PDF-MASTER/2021-04-PPR-05-Weslawski-etal.pdf L2 - http://journals.pan.pl/Content/120613 PY - 2021 IS - No 4 EP - 287–302 DO - 10.24425/ppr.2021.138586 KW - Arctic KW - Svalbard KW - Peracarida KW - congeneric species KW - sympatry KW - climate change A1 - Węsławski, Jan Marcin A1 - Legeżyńska, Joanna A1 - Kotwicki, Lech A1 - Mazurkiewicz, Mikołaj A1 - Olenin, Sergej PB - Polish Academy of Sciences PB - Committee on Polar Research VL - vol. 42 DA - 2021.09.06 T1 - Gammarus (Amphipoda) species competitive exclusion or coexistence as a result of climate change in the Arctic? SP - 287–302 UR - http://journals.pan.pl/dlibra/publication/edition/120613 T2 - Polish Polar Research ER -