Kjell R. Bjørklund

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Seven species of polycystine radiolarians and one phaeodarian species were investigated in order to determine the diversity of their associate organisms and their species specificity. Twelve partial 18S ribosomal DNA (rDNA) sequences were obtained showing a high diversity of associates, both within spumellarian and nassellarian radiolarians and among(More)
We have isolated cells of unculturable radiolarians from marine coastal waters. Individual cells were subjected to single cell whole genome amplification (SCWGA) and gene-targeted PCR. Using this approach we recover a surprisingly large diversity of sequences related to the enigmatic marine alveolate groups 1 and 2 (MALV I and MALV II) that most likely(More)
Radiolarians are marine planktonic protists that belong to the eukaryote supergroup Rhizaria together with Foraminifera and Cercozoa. Radiolaria has traditionally been divided into four main groups based on morphological characters; i.e. Polycystina, Acantharia, Nassellaria and Phaeodaria. But recent 18S rDNA phylogenies have shown that Phaeodaria belongs(More)
284 Polycystina (Euradiolaria, order Spumellaria and order Nassellaria) is a group of protozoans living in oceans and seas with a normal oceanic salinity, usually no lower than 31–32 psu. They are widely distributed in space and time, beginning from the Cambrian, and currently populate all oceans and most seas from the Arctic to the Antarctic. Data on(More)
The innovation of the eukaryote cytoskeleton enabled phagocytosis, intracellular transport, and cytokinesis, and is largely responsible for the diversity of morphologies among eukaryotes. Still, the relationship between phenotypic innovations in the cytoskeleton and their underlying genotype is poorly understood. To explore the genetic mechanism of(More)
The authors have established that, not earlier than 9000–10000 years ago, the main part of the modern fauna of polycystines (Polycystina, Radiolaria) migrated (and still continues to so do) from the Norwegian Sea into the Central Arctic Basin and the marginal seas of the Arctic Ocean’s Eurasian sector. Polycystines penetrate into the seas of the Amerasian(More)
Spontaneous mortality of seemingly healthy, farmed Atlantic salmon (Salmo salar L) is an increasing problem in Norwegian aquaculture. In this study, we present a morphological study of the previously undescribed syndrome of arteriosclerosis of the ventral aorta and epicarditis of the adjacent bulbus arteriosus found in farmed Atlantic salmon, with(More)
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