Cristin-resultat-ID: 1942935
Sist endret: 8. februar 2022, 10:37
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig artikkel
2021

Behavioural response of brown trout (Salmo trutta) to total dissolved gas supersaturation in a regulated river

Bidragsytere:
  • Robert J. Lennox
  • Kirstine Thiemer
  • Knut Wiik Vollset
  • Ulrich Pulg
  • Sebastian Stranzl
  • Cecilie Iden Nilsen
  • mfl.

Tidsskrift

Ecohydrology
ISSN 1936-0584
e-ISSN 1936-0592
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Publisert online: 2021
Trykket: 2022
Volum: 15
Hefte: 1
Artikkelnummer: e2363
Open Access

Importkilder

Scopus-ID: 2-s2.0-85118841809

Beskrivelse Beskrivelse

Tittel

Behavioural response of brown trout (Salmo trutta) to total dissolved gas supersaturation in a regulated river

Sammendrag

Total dissolved gas supersaturation from dams and power stations is a chronic freshwater pollutant that is toxic to animals with aquatic respiration. Laboratory ecotoxicology experiments have revealed capacity for captive fishes to saturoregulate by moving deeper, but field ecotoxicology research is largely lacking. We instrumented 94 brown trout in the Rysstad basin of the Otra River, Norway, with depth sensor acoustic transmitters and monitored their movements for 10 months. We found that the depths used by the trout largely protected them from the effects of total dissolved gas supersaturation, which ranged from 96% to 133% total gas pressure during the study. The depth use of fish was affected by sun position, lunar phase and spatial position in the river (i.e., available depth), and there was an extremely weak effect of total dissolved gas supersaturation that was counterintuitive (i.e., positive slope, movement toward surface). Depth traces of the fish revealed that nine fish died during the study, mostly coinciding with the first wave of supersaturation, consistent with observations of untagged dead fish with signs of gas bubble trauma found on the river bottom during this period (May-June). Overall, tagged trout exposure to total dissolved gas supersaturation depended on their use of depth, but responses to waves of extreme supersaturation at supraphysiological levels were weak and biologically insignificant, with individual variation and spatial position in the river most important in the model. Exposure to total dissolved gas supersaturation was mediated by individual differences in habitat use, which may be linked to activity and other traits that determine overall vulnerability to exposure to total dissolved gas supersaturation.

Bidragsytere

Robert J. Lennox

  • Tilknyttet:
    Forfatter
    ved NORCE Klima og miljø ved NORCE Norwegian Research Centre AS

Kirstine Thiemer

  • Tilknyttet:
    Forfatter
    ved Miljøvitenskap og naturforvaltning ved Norges miljø- og biovitenskapelige universitet
  • Tilknyttet:
    Forfatter
    ved Ferskvannsøkologi ved Norsk institutt for vannforskning

Knut Wiik Vollset

  • Tilknyttet:
    Forfatter
    ved NORCE Klima og miljø ved NORCE Norwegian Research Centre AS

Ulrich Pulg

  • Tilknyttet:
    Forfatter
    ved NORCE Klima og miljø ved NORCE Norwegian Research Centre AS

Sebastian Franz Stranzl

Bidragsyterens navn vises på dette resultatet som Sebastian Stranzl
  • Tilknyttet:
    Forfatter
    ved NORCE Klima og miljø ved NORCE Norwegian Research Centre AS
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