An under‑ice bloom of mixotrophic haptophytes in low nutrient and freshwater‑influenced Arctic waters
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An under‑ice bloom of mixotrophic haptophytes in low nutrient and freshwater‑influenced Arctic waters. / Søgaard, Dorte H.; Sorrell, Brian K.; Sejr, Mikael K. ; Andersen, Per; Rysgaard, Søren; Hansen, Per Juel; Skyttä, Annaliina; Lemcke, Signe; Lund-Hansen, Lars Chresten.
In: Scientific Reports, Vol. 11, 11:2915, 2021.Research output: Contribution to journal › Journal article › peer-review
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T1 - An under‑ice bloom of mixotrophic haptophytes in low nutrient and freshwater‑influenced Arctic waters
AU - Søgaard, Dorte H.
AU - Sorrell, Brian K.
AU - Sejr, Mikael K.
AU - Andersen, Per
AU - Rysgaard, Søren
AU - Hansen, Per Juel
AU - Skyttä, Annaliina
AU - Lemcke, Signe
AU - Lund-Hansen, Lars Chresten
PY - 2021
Y1 - 2021
N2 - The pelagic spring bloom is essential for Arctic marine food webs, and a crucial driver of carbon transport to the ocean depths. A critical challenge is understanding its timing and magnitude, to predict its changes in coming decades. Spring bloom onset is typically light-limited, beginning whenirradiance increases or during ice breakup. Here we report an acute 9-day under-ice algal bloom in nutrient-poor, freshwater-influenced water under 1-m thick sea ice. It was dominated by mixotrophic brackish water haptophytes (Chrysochromulina/ Prymnesium) that produced 5.7 g C m−2 new production. This estimate represents about half the annual pelagic production, occurring below sea ice with a large contribution from the mixotrophic algae bloom. The freshwater-influenced, nutrient dilute and low light environment combined with mixotrophic community dominance implies that phagotrophy played a critical role in the under-ice bloom. We argue that such blooms dominated bypotentially toxic mixotrophic algae might become more common and widespread in the future Arctic Ocean.
AB - The pelagic spring bloom is essential for Arctic marine food webs, and a crucial driver of carbon transport to the ocean depths. A critical challenge is understanding its timing and magnitude, to predict its changes in coming decades. Spring bloom onset is typically light-limited, beginning whenirradiance increases or during ice breakup. Here we report an acute 9-day under-ice algal bloom in nutrient-poor, freshwater-influenced water under 1-m thick sea ice. It was dominated by mixotrophic brackish water haptophytes (Chrysochromulina/ Prymnesium) that produced 5.7 g C m−2 new production. This estimate represents about half the annual pelagic production, occurring below sea ice with a large contribution from the mixotrophic algae bloom. The freshwater-influenced, nutrient dilute and low light environment combined with mixotrophic community dominance implies that phagotrophy played a critical role in the under-ice bloom. We argue that such blooms dominated bypotentially toxic mixotrophic algae might become more common and widespread in the future Arctic Ocean.
U2 - 10.1038/s41598-021-82413-y
DO - 10.1038/s41598-021-82413-y
M3 - Journal article
C2 - 33536514
VL - 11
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
M1 - 11:2915
ER -
ID: 256327624