• Assessing the Value of a Citizen Science Approach for Ctenophore Identification 

      Johansen, Ellie; Aberle-Malzahn, Nicole; Østensen, Mari-Ann; Majaneva, Sanna (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-19)
      During the era of biodiversity loss, a complete species census and understanding where the different species occur is of high priority. Even though this knowledge has increased tremendously, mainly with expanded use of integrated taxonomic identification, there are groups where our knowledge is very limited, both in terms of diversity and distribution. Ctenophores are such a group. Due to a lack of ...
    • Deficiency syndromes in top predators associated with large-scale changes in the Baltic Sea ecosystem 

      Majaneva, Sanna; Fridolfsson, Emil; Casini, Michele; Legrand, Catherine; Lindehoff, Elin; Margonski, Piotr; Majaneva, Markus; Nilsson, Jonas; Rubene, Gunta; Wasmund, Norbert; Hylander, Samuel (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-09)
      Vitamin B<sub>1</sub> (thiamin) deficiency is an issue periodically affecting a wide range of taxa worldwide. In aquatic pelagic systems, thiamin is mainly produced by bacteria and phytoplankton and is transferred to fish and birds via zooplankton, but there is no general consensus on when or why this transfer is disrupted. We focus on the occurrence in salmon (<i>Salmo salar</i>) of a thiamin ...
    • Environmental niche overlap in sibling planktonic species Calanus finmarchicus and C. glacialis in Arctic fjords 

      Weydmann-Zwolicka, Agata; Cottier, Finlo Robert; Berge, Jørgen; Majaneva, Sanna; Kuklinski, Piotr; Zwolicki, Adrian (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-08)
      Knowledge of environmental preferences of the key planktonic species, such as Calanus copepods in the Arctic, is crucial to understand ecosystem function and its future under climate change. Here, we assessed the environmental conditions influencing the development stages of Atlantic Calanus finmarchicus and Arctic Calanus glacialis, and we quantified the extent to which their niches overlap by ...
    • Hiding in plain sight - Euplokamis dunlapae (Ctenophora) in Norwegian waters 

      Majaneva, Sanna; Ringvold, Halldis; Johansen, Ellie; Østensen, Mari-Ann; Hosia, Aino Laila Johanna (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-17)
      Cydippid ctenophores of genus Euplokamis have been rarely reported from the north-east Atlantic in the scientific literature. The conspicuous lack of previous records is likely attributable to methodological constraints detrimental to sampling ctenophores, including the use of plankton nets and preservation of samples as well as poor identification literature and a lack of taxonomic expertise on ...
    • Zooplankton and sediment fluxes in two contrasting fjords reveal Atlantification of the Arctic 

      Weydmann-Zwolicka, Agata; Prątnicka, Paula; Łącka, Magdalena; Majaneva, Sanna; Cottier, Finlo Robert; Berge, Jørgen (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-04)
      Svalbard fjords are facing a significant increase in Atlantic water inflow, which influences all ecosystem components, thus the objective of this study was to assess how recent Atlantification impacts the functioning of zooplankton community. For this purpose, two year-round operating sediment traps and associated hydrographic instruments, providing continuous time series of zooplankton and sediment ...