Cristin-resultat-ID: 1966372
Sist endret: 7. januar 2022, 15:40
NVI-rapporteringsår: 2022
Resultat
Vitenskapelig artikkel
2022

Net heterotrophy in High Arctic first-year and multi-year spring sea ice

Bidragsytere:
  • Karley Campbell
  • Benjamin Lange
  • Jack Christopher Landy
  • Christian Katlein
  • Marcel Nicolaus
  • Philipp Anhaus
  • mfl.

Tidsskrift

Elementa: Science of the Anthropocene
ISSN 2325-1026
e-ISSN 2325-1026
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2022
Publisert online: 2022
Volum: 10
Hefte: 1
Open Access

Importkilder

Scopus-ID: 2-s2.0-85122735329

Klassifisering

Vitenskapsdisipliner

Marinbiologi

Emneord

Sjøis • Oseanografi

Beskrivelse Beskrivelse

Tittel

Net heterotrophy in High Arctic first-year and multi-year spring sea ice

Sammendrag

The net productivity of sea ice is determined by the physical and geochemical characteristics of the ice–ocean system and the activity of organisms inhabiting the ice. Differences in habitat suitability between first-year and multi-year sea ice can affect the ice algal community composition and acclimation state, introducing considerable variability to primary production within each ice type. In this study, we characterized the biogeochemical variability between adjacent first-year and multi-year sea ice floes in the Lincoln Sea of the Canadian High Arctic, during the May 2018 Multidisciplinary Arctic Program—Last Ice sampling campaign. Combining measurements of transmitted irradiance from a remotely operated underwater vehicle with laboratory-based oxygen optode incubations, this work shows widespread heterotrophy (net oxygen uptake) in the bottom 10 cm of both ice types, particularly in thick multi-year ice (>2.4 m) and early morning of the 24-h day. Algal acclimation state and species composition varied between ice types despite similar net community production due to widespread light and nutrient limitation. The first-year ice algal community was increasingly dominated over spring by the potentially toxin-producing genus Pseudonitzschia that was acclimated to high and variable light conditions characteristic of a thinner ice habitat with mobile snow cover. In comparison, the multi-year ice harbored more shade-acclimated algae of mixed composition. This work highlights the potential for heterotrophy in sea ice habitats of the High Arctic, including first measurements of such O2-uptake in multi-year ice floes. Observed differences in photophysiology between algae of these sea ice types suggests that a shift toward higher light availability and a younger sea ice cover with climate change does not necessarily result in a more productive system. Instead, it may favor future sea ice algal communities of different species composition, with lower photosynthetic potential but greater resilience to stronger and more variable light conditions.

Bidragsytere

Karley Lynn Campbell

Bidragsyterens navn vises på dette resultatet som Karley Campbell
  • Tilknyttet:
    Forfatter
    ved University of Bristol
  • Tilknyttet:
    Forfatter
    ved Institutt for arktisk og marin biologi ved UiT Norges arktiske universitet

Benjamin Allen Lange

Bidragsyterens navn vises på dette resultatet som Benjamin Lange
  • Tilknyttet:
    Forfatter
    ved Fisheries and Oceans Canada
  • Tilknyttet:
    Forfatter
    ved Forskningsavdelingen ved Norsk Polarinstitutt

Jack Christopher Landy

  • Tilknyttet:
    Forfatter
    ved University of Bristol
  • Tilknyttet:
    Forfatter
    ved Institutt for fysikk og teknologi ved UiT Norges arktiske universitet

Christian Katlein

  • Tilknyttet:
    Forfatter
    ved Alfred-Wegener-Institut für Polar- und Meeresforschung

Marcel Nicolaus

  • Tilknyttet:
    Forfatter
    ved Alfred-Wegener-Institut für Polar- und Meeresforschung
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