The malacostracan fauna of two Arctic fjords (west Spitsbergen) : the diversity and distribution patterns of its pelagic and benthic components

• Autorzy: Legeżyńska J. , Włodarska-Kowalczuk M. , Głuchowska M. , Ormańczyk M. , Kędra M. , Węsławski J. M.

Identyfikatory

DOI

10.1016/j.oceano.2017.01.004

• Języki publikacji: EN

Abstrakty

EN

This study examines the performance of pelagic and benthic Malacostraca in two glacial fjords of west Spitsbergen: Kongsfjorden, strongly influenced by warm Atlantic waters, and Hornsund which, because of the strong impact of the cold Sørkapp Current, has more of an Arctic character. The material was collected during 12 summer expeditions organized from 1997 to 2013. In all, 24 pelagic and 116 benthic taxa were recorded, most of them widely distributed Arctic-boreal species. The advection of different water masses from the shelf had a direct impact on the structure of the pelagic Malacostraca communities, resulting in the clear dominance of the sub-arctic hyperiid amphipod Themisto abyssorum in Kongsfjorden and the great abundance of Decapoda larvae in Hornsund. The taxonomic, functional and size compositions of the benthic malacostracan assemblages varied between the two fjords, and also between the glacier-proximate inner bays and the main fjord basins, as a result of the varying dominance patterns of the same assemblage of species. There was a significant drop in species richness in the strongly disturbed glacial bays of both fjords, but only in Hornsund was this accompanied by a significant decrease in density and diversity, probably due to greater isolation and poorer quality of sediment organic matter in its innermost basin. Our results suggest that the diversity and distribution of benthic malacostracans in these two fjords are only distantly related to the different hydrological regimes; rather, they are governed by locally acting factors, such as depth, sediment type, the variety of microhabitats and the availability and quality of food.

Słowa kluczowe

EN

Malacostraca; Arctic; Svalbard; diversity; distribution

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2017
• Tom: No. 59 (4)
• Strony: 541--564
• Opis fizyczny: Bibliogr. 103 poz., mapy, tab., wykr.

Twórcy

autor

Legeżyńska J.

• Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland

autor

Włodarska-Kowalczuk M.

• Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland

autor

Głuchowska M.

• Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland

autor

Ormańczyk M.

• Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland

autor

Kędra M.

• Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland

autor

Węsławski J. M.

• Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland

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