DataSheet_1_Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic.pdf
Krill represent a major link between primary producers and higher trophic levels in polar marine food webs. Potential links to lower trophic levels, such as heterotrophic microorganisms, are less well documented. Here, we studied the kinetics of microbial degradation of sinking carcasses of two domi...
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ftfrontimediafig:oai:figshare.com:article/21493440 2024-09-15T18:10:07+00:00 DataSheet_1_Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic.pdf Belén Franco-Cisterna Anni Glud Laura A. Bristow Arka Rudra Hamed Sanei Mie H.S. Winding Torkel G. Nielsen Ronnie N. Glud Peter Stief 2022-11-03T11:57:58Z https://doi.org/10.3389/fmars.2022.1019727.s001 https://figshare.com/articles/dataset/DataSheet_1_Sinking_krill_carcasses_as_hotspots_of_microbial_carbon_and_nitrogen_cycling_in_the_Arctic_pdf/21493440 unknown doi:10.3389/fmars.2022.1019727.s001 https://figshare.com/articles/dataset/DataSheet_1_Sinking_krill_carcasses_as_hotspots_of_microbial_carbon_and_nitrogen_cycling_in_the_Arctic_pdf/21493440 CC BY 4.0 Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Biological carbon pump marine snow nitrogen carbon oxygen krill degradation mineralization Dataset 2022 ftfrontimediafig https://doi.org/10.3389/fmars.2022.1019727.s001 2024-08-19T06:20:00Z Krill represent a major link between primary producers and higher trophic levels in polar marine food webs. Potential links to lower trophic levels, such as heterotrophic microorganisms, are less well documented. Here, we studied the kinetics of microbial degradation of sinking carcasses of two dominant krill species Thysanoessa raschii and Meganyctiphanes norvegica from Southwest Greenland. Degradation experiments under oxic conditions showed that 6.0-9.1% of carbon and 6.4-7.1% of nitrogen were lost from the carcasses after one week. Aerobic microbial respiration and the release of dissolved organic carbon were the main pathways of carbon loss from the carcasses. Ammonium release generally contributed the most to carcass nitrogen loss. Oxygen micro profiling revealed anoxic conditions inside krill carcasses/specimens, allowing anaerobic nitrogen cycling through denitrification and dissimilatory nitrate reduction to ammonium (DNRA). Denitrification rates were up to 5.3 and 127.7 nmol N carcass -1 d -1 for T. raschii and M. norvegica, respectively, making krill carcasses hotspots of nitrogen loss in the oxygenated water column of the fjord. Carcass-associated DNRA rates were up to 4-fold higher than denitrification rates, but the combined activity of these two anaerobic respiration processes did not contribute significantly to carbon loss from the carcasses. Living krill specimens did not harbor any significant denitrification and DNRA activity despite having an anoxic gut as revealed by micro profiling. The investigated krill carcasses sink fast (1500-3000 m d -1 ) and our data show that only a small fraction of the associated carbon is lost during descent. Based on data on krill distribution, our findings are used to discuss the potential importance of sinking krill carcasses for sustaining benthic food webs in the Arctic. Dataset Greenland Meganyctiphanes norvegica Thysanoessa raschii Frontiers: Figshare |
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Open Polar |
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Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Biological carbon pump marine snow nitrogen carbon oxygen krill degradation mineralization |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Biological carbon pump marine snow nitrogen carbon oxygen krill degradation mineralization Belén Franco-Cisterna Anni Glud Laura A. Bristow Arka Rudra Hamed Sanei Mie H.S. Winding Torkel G. Nielsen Ronnie N. Glud Peter Stief DataSheet_1_Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic.pdf |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering Biological carbon pump marine snow nitrogen carbon oxygen krill degradation mineralization |
description |
Krill represent a major link between primary producers and higher trophic levels in polar marine food webs. Potential links to lower trophic levels, such as heterotrophic microorganisms, are less well documented. Here, we studied the kinetics of microbial degradation of sinking carcasses of two dominant krill species Thysanoessa raschii and Meganyctiphanes norvegica from Southwest Greenland. Degradation experiments under oxic conditions showed that 6.0-9.1% of carbon and 6.4-7.1% of nitrogen were lost from the carcasses after one week. Aerobic microbial respiration and the release of dissolved organic carbon were the main pathways of carbon loss from the carcasses. Ammonium release generally contributed the most to carcass nitrogen loss. Oxygen micro profiling revealed anoxic conditions inside krill carcasses/specimens, allowing anaerobic nitrogen cycling through denitrification and dissimilatory nitrate reduction to ammonium (DNRA). Denitrification rates were up to 5.3 and 127.7 nmol N carcass -1 d -1 for T. raschii and M. norvegica, respectively, making krill carcasses hotspots of nitrogen loss in the oxygenated water column of the fjord. Carcass-associated DNRA rates were up to 4-fold higher than denitrification rates, but the combined activity of these two anaerobic respiration processes did not contribute significantly to carbon loss from the carcasses. Living krill specimens did not harbor any significant denitrification and DNRA activity despite having an anoxic gut as revealed by micro profiling. The investigated krill carcasses sink fast (1500-3000 m d -1 ) and our data show that only a small fraction of the associated carbon is lost during descent. Based on data on krill distribution, our findings are used to discuss the potential importance of sinking krill carcasses for sustaining benthic food webs in the Arctic. |
format |
Dataset |
author |
Belén Franco-Cisterna Anni Glud Laura A. Bristow Arka Rudra Hamed Sanei Mie H.S. Winding Torkel G. Nielsen Ronnie N. Glud Peter Stief |
author_facet |
Belén Franco-Cisterna Anni Glud Laura A. Bristow Arka Rudra Hamed Sanei Mie H.S. Winding Torkel G. Nielsen Ronnie N. Glud Peter Stief |
author_sort |
Belén Franco-Cisterna |
title |
DataSheet_1_Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic.pdf |
title_short |
DataSheet_1_Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic.pdf |
title_full |
DataSheet_1_Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic.pdf |
title_fullStr |
DataSheet_1_Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic.pdf |
title_full_unstemmed |
DataSheet_1_Sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the Arctic.pdf |
title_sort |
datasheet_1_sinking krill carcasses as hotspots of microbial carbon and nitrogen cycling in the arctic.pdf |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.1019727.s001 https://figshare.com/articles/dataset/DataSheet_1_Sinking_krill_carcasses_as_hotspots_of_microbial_carbon_and_nitrogen_cycling_in_the_Arctic_pdf/21493440 |
genre |
Greenland Meganyctiphanes norvegica Thysanoessa raschii |
genre_facet |
Greenland Meganyctiphanes norvegica Thysanoessa raschii |
op_relation |
doi:10.3389/fmars.2022.1019727.s001 https://figshare.com/articles/dataset/DataSheet_1_Sinking_krill_carcasses_as_hotspots_of_microbial_carbon_and_nitrogen_cycling_in_the_Arctic_pdf/21493440 |
op_rights |
CC BY 4.0 |
op_doi |
https://doi.org/10.3389/fmars.2022.1019727.s001 |
_version_ |
1810447712261242880 |