Impact of shelf-transformed waters (STW) on foraminiferal assemblages in the outwash and glacial fjords of Adventfjorden and Hornsund, Svalbard

• Autorzy: Szymanska N. , Pawlowska J. , Kucharska M. , Kujawa A. , Lacka M. , Zajaczkowski M.
• Języki publikacji: EN

Abstrakty

EN

A new dataset of benthic foraminiferal assemblages from Adventfjorden (tributary fjord of Isfjorden, West Spitsbergen) was compared with the results of a study conducted by Zajączkowski et al. (2010) in Hornsund (West Spitsbergen). According to Nilsen et al. (2016), Atlantic water inflow to the Isfjorden Trough occurs more readily than to anywhere else along the shelf of Spitsbergen; thus, we compared the foraminiferal assemblages of the outwash Adventfjorden fjord, located in the Isfjorden system, with glacial Hornsund, located in southwest Spitsbergen. Despite the juxtaposition of Adventfjorden and Hornsund the data revealed varying impacts of shelf-transformed water (STW) on the benthic foraminiferal assemblages. Outer and central Adventfjorden was dominated by Adercotryma glomerata, Recurvoides turbinata and Spiroplectammina sp., reflecting the presence of STW, while abundant Melonis barleeanus in the central area of the fjord indicated a large flux of unaltered organic matter. Only the head of the fjord was dominated by the glaciomarine taxa Cassidulina reniforme and Elphidium clavatum. Foraminiferal fauna characteristic of STW-influenced environments (i.e., Nonionellina labradorica and R. turbinata) were also observed in outer Hornsund. However, the glacier-proximal taxa E. clavatum and C. reniforme were dominant throughout the fjord, demonstrating the impacts of meltwater and high sedimentation. Therefore, it is likely that in Hornsund, glacial impact is a major environmental factor, which is stronger than the influence of STW.

Słowa kluczowe

EN

Atlantic water; foraminiferal assemblage; glacial fjord; outwash fjord; Adventfjorden; Hornsund; Svalbard; inflow water; salinity; water temperature; environment change

• Wydawca: -
• Czasopismo: Oceanologia
• Rocznik: 2017
• Tom: 59
• Numer: 4
• Opis fizyczny: p.525-540,fig.,ref.

Twórcy

autor

Szymanska N.

• Institute of Oceanology, Polish Academy of Sciences, Powstancow Warszawy 55, 81-712 Sopot, Poland

autor

Pawlowska J.

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

autor

Kucharska M.

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

autor

Kujawa A.

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

autor

Lacka M.

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

autor

Zajaczkowski M.

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

Identyfikatory

DOI

10.1016/j.oceano.2017.04.006