Photosynthetic light requirement near the theoretical minimum detected in Arctic microalgae.

Autor: Hoppe CJM; Alfred-Wegener-Institut-Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany. Clara.Hoppe@awi.de., Fuchs N; Center for Earth System Sustainability, Institute of Oceanography, University of Hamburg, Hamburg, Germany., Notz D; Center for Earth System Sustainability, Institute of Oceanography, University of Hamburg, Hamburg, Germany., Anderson P; Scottish Association for Marine Science, Oban, Scotland., Assmy P; Norwegian Polar Institute, Fram Centre, Tromsø, Norway., Berge J; UiT The Arctic University of Norway, Tromsø, Norway., Bratbak G; University of Bergen, Bergen, Norway., Guillou G; Joint Research Unit Littoral, Environment and Societies (CNRS-University of La Rochelle), La Rochelle, France., Kraberg A; Alfred-Wegener-Institut-Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Larsen A; NORCE Norwegian Research Centre, Bergen, Norway., Lebreton B; Joint Research Unit Littoral, Environment and Societies (CNRS-University of La Rochelle), La Rochelle, France., Leu E; Akvaplan-niva, Tromsø, Norway., Lucassen M; Alfred-Wegener-Institut-Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Müller O; University of Bergen, Bergen, Norway., Oziel L; Alfred-Wegener-Institut-Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany., Rost B; Alfred-Wegener-Institut-Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany.; Faculty of Biology/Chemistry, University Bremen, Bremen, Germany., Schartmüller B; UiT The Arctic University of Norway, Tromsø, Norway., Torstensson A; Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.; Swedish Meteorological and Hydrological Institute, Community Planning Services-Oceanography, Västra Frölunda, Sweden., Wloka J; Independent Researcher, Bremen, Germany.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Sep 04; Vol. 15 (1), pp. 7385. Date of Electronic Publication: 2024 Sep 04.
DOI: 10.1038/s41467-024-51636-8
Abstrakt: Photosynthesis is one of the most important biological processes on Earth, providing the main source of bioavailable energy, carbon, and oxygen via the use of sunlight. Despite this importance, the minimum light level sustaining photosynthesis and net growth of primary producers in the global ocean is still unknown. Here, we present measurements from the MOSAiC field campaign in the central Arctic Ocean that reveal the resumption of photosynthetic growth and algal biomass buildup under the ice pack at a daily average irradiance of not more than 0.04 ± 0.02 µmol photons m -2  s -1 in late March. This is at least one order of magnitude lower than previous estimates (0.3-5 µmol photons m -2  s -1 ) and near the theoretical minimum light requirement of photosynthesis (0.01 µmol photons m -2  s -1 ). Our findings are based on measurements of the temporal development of the under-ice light field and concurrent measurements of both chlorophyll a concentrations and potential net primary production underneath the sea ice at 86 °N. Such low light requirements suggest that euphotic zones where photosynthesis can occur in the world's oceans may extend further in depth and time, with major implications for global productivity estimates.
(© 2024. The Author(s).)
Databáze: MEDLINE
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