Radiolaria and Phaeodaria (siliceous Rhizaria) in south-western and northern Norwegian fjords during late summer 2016: dominant species and biomass in shallow-water assemblages
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https://hdl.handle.net/10037/31546Date
2023-09-21Type
Journal articleTidsskriftartikkel
Peer reviewed
Author
Ikenoue, Takahito; Bjørklund, Kjell Rasmus; Krabberød, Anders Kristian; Nishino, Shigeto; Wassmann, PaulAbstract
To determine the present-day community composition of siliceous Rhizaria
(Radiolaria and Phaeodaria) in Norwegian fjords, plankton tows were conducted in south-western and northern Norwegian fjords in September 2016.
The mean total abundance of radiolarians was 306 m–3 in the Sognefjord complex, which was the southern research site, and, in the north, 945 m–3 in
Malangen and 89 m–3 in Balsfjord, both above the Arctic Circle. Sticholonche
zanclea was the most abundant radiolarian in the Sognefjord complex and
Malangen, accounting for 78–100% (mean 89%) of radiolarian abundance.
The mean total abundance of phaeodarians was 1554 m–3 in the Sognefjord
complex, 51 m–3 in Malangen and 11 m–3 in Balsfjord. Medusetta arcifera was the
most abundant phaeodaria in the Sognefjord complex, accounting for >99% of
phaeodarian abundance, but was absent in Malangen and Balsfjord, where
Protocystis tridens accounted for >96% of phaeodarian abundance. The carbon
biomass of S. zanclea and M. arcifera was 188 and 438 µg C m–3, respectively,
which is similar to and 8.6 times higher than, respectively, that of phaeodarians
>1 mm in the western North Pacific, suggesting that M. arcifera contributes to
organic carbon transport in the Sognefjord complex. Amphimelissa setosa
(Nassellaria, Radiolaria), which was a dominant species in the study area in
1982–83, was absent in the present study in all sampled fjords. This could have
been caused by the approximately 2 °C increase in water temperature that has
occurred since 1990 and can be taken as evidence of a climate-change-associated local temperature rise linked to the warming of advected Atlantic Water.
Publisher
Norwegian Polar InstituteCitation
Ikenoue, Bjørklund, Krabberød, Nishino, Wassmann. Radiolaria and Phaeodaria (siliceous Rhizaria) in south-western and northern Norwegian fjords during late summer 2016: dominant species and biomass in shallow-water assemblages. Polar Research. 2023;42Metadata
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