Replication Data for: Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night
This dataset contains data files to the winter microbial ecology in a sub-Arctic fjord in northern Norway. The polar night has recently received increased attention as a surprisingly active biological season. Yet, polar night microbial ecology is a vastly understudied field. To identify the physical...
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Online Access: | https://doi.org/10.18710/WG4Y4J |
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ftdataverseno:doi:10.18710/WG4Y4J 2024-10-13T14:05:07+00:00 Replication Data for: Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night Klausen, Line Vonnahme, Tobias R. Bank, Rose M. Michellod, Dolma Dietrich, Ulrikke Gradinger, Rolf Klausen, Line RV Hyas Larvik, Gaute Gerhardsen, Frode Kunuk, Lennart Tatone, Ivan Nordli, Evald Dubourg, Paul 2022-02-28 https://doi.org/10.18710/WG4Y4J English eng DataverseNO https://doi.org/10.18710/WG4Y4J Earth and Environmental Sciences polar night marine bacteria phytoplankton bloom microalgae fjord community structure land-fjord interactions microbial ecology Ramfjorden Norway Oceanographic data Biochemical data Community structure 2022 ftdataverseno https://doi.org/10.18710/WG4Y4J 2024-09-24T14:11:59Z This dataset contains data files to the winter microbial ecology in a sub-Arctic fjord in northern Norway. The polar night has recently received increased attention as a surprisingly active biological season. Yet, polar night microbial ecology is a vastly understudied field. To identify the physical and biogeochemical parameters driving microbial activity over the dark season, we studied a sub-Arctic fjord system in northern Norway from autumn to early spring with detailed monthly sampling. We focused on the impact that mixing, terrestrial organic matter input and light have on the dynamics of the microbial ecosystem. Our study highlights strong seasonal differences in the key drivers during spring, autumn, and winter. The spring bloom starts while the water column is still fully mixed, opposing the traditional critical depth hypothesis. We identified incident solar radiation as the key driver for a spring bloom starting in March. However, it takes until April before the bloom reaches substantial chlorophyll biomass. The autumn bloom is controlled by vertical mixing, driving nutrient upwelling and dilution of zooplankton grazers, which had their highest biomass during this time. We suggest that the dilution-recoupling hypothesis stating that dilution of zooplankton by vertical mixing is crucial to reduce grazing stress and allow a bloom formation is crucial for the autumn bloom. We found that even a short period with a lack of terrestrial runoff due to subzero temperatures in combination with strong winds was able to mix the water column, triggering an October/November autumn bloom. During the light-limited polar night primary production was extremely low, but bacteria continued growing on decaying algae and their exudates, but also allochthonous organic matter. We suggest that a melting event in January could fuel a mid-winter bacteria bloom. In conclusion, polar night biogeochemistry and microbial ecology is not only driven by light availability, but strongly affected by freshwater discharge and land-ocean ... Other/Unknown Material Arctic Northern Norway Phytoplankton polar night Zooplankton DataverseNO Arctic Norway Ramfjorden ENVELOPE(19.062,19.062,69.545,69.545) |
institution |
Open Polar |
collection |
DataverseNO |
op_collection_id |
ftdataverseno |
language |
English |
topic |
Earth and Environmental Sciences polar night marine bacteria phytoplankton bloom microalgae fjord community structure land-fjord interactions microbial ecology Ramfjorden Norway |
spellingShingle |
Earth and Environmental Sciences polar night marine bacteria phytoplankton bloom microalgae fjord community structure land-fjord interactions microbial ecology Ramfjorden Norway Klausen, Line Vonnahme, Tobias R. Bank, Rose M. Michellod, Dolma Dietrich, Ulrikke Gradinger, Rolf Replication Data for: Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night |
topic_facet |
Earth and Environmental Sciences polar night marine bacteria phytoplankton bloom microalgae fjord community structure land-fjord interactions microbial ecology Ramfjorden Norway |
description |
This dataset contains data files to the winter microbial ecology in a sub-Arctic fjord in northern Norway. The polar night has recently received increased attention as a surprisingly active biological season. Yet, polar night microbial ecology is a vastly understudied field. To identify the physical and biogeochemical parameters driving microbial activity over the dark season, we studied a sub-Arctic fjord system in northern Norway from autumn to early spring with detailed monthly sampling. We focused on the impact that mixing, terrestrial organic matter input and light have on the dynamics of the microbial ecosystem. Our study highlights strong seasonal differences in the key drivers during spring, autumn, and winter. The spring bloom starts while the water column is still fully mixed, opposing the traditional critical depth hypothesis. We identified incident solar radiation as the key driver for a spring bloom starting in March. However, it takes until April before the bloom reaches substantial chlorophyll biomass. The autumn bloom is controlled by vertical mixing, driving nutrient upwelling and dilution of zooplankton grazers, which had their highest biomass during this time. We suggest that the dilution-recoupling hypothesis stating that dilution of zooplankton by vertical mixing is crucial to reduce grazing stress and allow a bloom formation is crucial for the autumn bloom. We found that even a short period with a lack of terrestrial runoff due to subzero temperatures in combination with strong winds was able to mix the water column, triggering an October/November autumn bloom. During the light-limited polar night primary production was extremely low, but bacteria continued growing on decaying algae and their exudates, but also allochthonous organic matter. We suggest that a melting event in January could fuel a mid-winter bacteria bloom. In conclusion, polar night biogeochemistry and microbial ecology is not only driven by light availability, but strongly affected by freshwater discharge and land-ocean ... |
author2 |
Klausen, Line RV Hyas Larvik, Gaute Gerhardsen, Frode Kunuk, Lennart Tatone, Ivan Nordli, Evald Dubourg, Paul |
format |
Other/Unknown Material |
author |
Klausen, Line Vonnahme, Tobias R. Bank, Rose M. Michellod, Dolma Dietrich, Ulrikke Gradinger, Rolf |
author_facet |
Klausen, Line Vonnahme, Tobias R. Bank, Rose M. Michellod, Dolma Dietrich, Ulrikke Gradinger, Rolf |
author_sort |
Klausen, Line |
title |
Replication Data for: Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night |
title_short |
Replication Data for: Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night |
title_full |
Replication Data for: Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night |
title_fullStr |
Replication Data for: Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night |
title_full_unstemmed |
Replication Data for: Light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-Arctic fjord over the Polar night |
title_sort |
replication data for: light and freshwater discharge drive the biogeochemistry and microbial ecology in a sub-arctic fjord over the polar night |
publisher |
DataverseNO |
publishDate |
2022 |
url |
https://doi.org/10.18710/WG4Y4J |
long_lat |
ENVELOPE(19.062,19.062,69.545,69.545) |
geographic |
Arctic Norway Ramfjorden |
geographic_facet |
Arctic Norway Ramfjorden |
genre |
Arctic Northern Norway Phytoplankton polar night Zooplankton |
genre_facet |
Arctic Northern Norway Phytoplankton polar night Zooplankton |
op_relation |
https://doi.org/10.18710/WG4Y4J |
op_doi |
https://doi.org/10.18710/WG4Y4J |
_version_ |
1812811002561953792 |