Cristin-resultat-ID: 2044924
Sist endret: 18. januar 2023, 12:14
NVI-rapporteringsår: 2022
Resultat
Vitenskapelig artikkel
2022

Spatial and biological oceanographic insights into the massive fish-killing bloom of the haptophyte Chrysochromulina leadbeateri in northern Norway

Bidragsytere:
  • Uwe John
  • Luka Supraha
  • Sandra Gran-Stadniczeñko
  • Carina Bunse
  • Allan Cembella
  • Wenche Eikrem
  • mfl.

Tidsskrift

Harmful Algae
ISSN 1568-9883
e-ISSN 1878-1470
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2022
Volum: 118
Artikkelnummer: 102287
Open Access

Importkilder

Scopus-ID: 2-s2.0-85134757535

Beskrivelse Beskrivelse

Tittel

Spatial and biological oceanographic insights into the massive fish-killing bloom of the haptophyte Chrysochromulina leadbeateri in northern Norway

Sammendrag

A bloom of the fish-killing haptophyte Chrysochromulina leadbeateri in northern Norway during May and June 2019 was the most harmful algal event ever recorded in the region, causing massive mortalities of farmed salmon. Accordingly, oceanographic and biodiversity aspects of the bloom were studied in unprecedented detail, based on metabarcoding and physico-chemical and biotic factors related with the dynamics and distribution of the bloom. Light- and electron-microscopical observations of nanoplankton samples from diverse locations confirmed that C. leadbeateri was dominant in the bloom and the primary cause of associated fish mortalities. Cell counts by light microscopy and flow cytometry were obtained throughout the regional bloom within and adjacent to five fjord systems. Metabarcoding sequences of the V4 region of the 18S rRNA gene from field material collected during the bloom and a cultured isolate from offshore of Tromsøy island confirmed the species identification. Sequences from three genetic markers (18S, 28S rRNA gene and ITS region) verified the close if not identical genetic similarity to C. leadbeateri from a previous massive fish-killing bloom in 1991 in northern Norway. The distribution and cell abundance of C. leadbeateri and related Chrysochromulina species in the recent incident were tracked by integrating observations from metabarcoding sequences of the V4 region of the 18S rRNA gene. Metabarcoding revealed at least 14 distinct Chrysochromulina variants, including putative cryptic species. C. leadbeateri was by far the most abundant of these species, but with high intraspecific genetic variability. Highest cell abundance of up to 2.7 × 107 cells L 􀀀 1 of C. leadbeateri was found in Balsfjorden; the high cell densities were associated with stratification near the pycnocline (at ca. 12 m depth) within the fjord. The cell abundance of C. leadbeateri showed positive correlations with temperature, negative correlation with salinity, and a slightly positive correlation with ambient phosphate and nitrate concentrations. The spatio-temporal succession of the C. leadbeateri bloom suggests independent initiation from existing pre-bloom populations in local zones, perhaps sustained and supplemented over time by northeastward advection of the bloom from the fjords

Bidragsytere

Uwe John

  • Tilknyttet:
    Forfatter
    ved Alfred-Wegener-Institut für Polar- und Meeresforschung
  • Tilknyttet:
    Forfatter
    ved Carl von Ossietzky Universität Oldenburg

Luka Supraha

  • Tilknyttet:
    Forfatter
    ved Seksjon for akvatisk biologi og toksikologi ved Universitetet i Oslo

Sandra Stadniczeñko Gran

Bidragsyterens navn vises på dette resultatet som Sandra Gran-Stadniczeñko
  • Tilknyttet:
    Forfatter
    ved Seksjon for akvatisk biologi og toksikologi ved Universitetet i Oslo

Carina Bunse

  • Tilknyttet:
    Forfatter
    ved Carl von Ossietzky Universität Oldenburg

Allan Cembella

  • Tilknyttet:
    Forfatter
    ved Alfred-Wegener-Institut für Polar- und Meeresforschung
1 - 5 av 13 | Neste | Siste »