Sea-ice meiofauna biodiversity from the Micro-SHIFT Hanna Huntscha UiT The Arctic University of Norway hahun8781@uit.no Miriam Marquardt UiT The Arctic University of Norway miriam.marquardt@uit.no 0000-0003-2913-067X Camilla Svensen UiT The Arctic University of Norway camilla.svensen@uit.no 0000-0001-9577-3935 2026-08-25 eng The data was collected during the Micro-SHIFT cruise in May 2025 (cruise number: MS7006) onboard the research vessel RV Kronprins Haakon (cruise report: https://data.npolar.no/dataset/90e39c2b-fd7f-44d7-a58c-866f8dea66de). The expedition was a 20-day drift study. The dataset contains individual countas, abundance and biomass of sea-ice meiofauna (> 20 µm) including metazoans eggs and large protists such as foraminifers and ciliates. Sea-ice meiofauna were identified and counted with a stereo microscopy and results are given as Individuals per liter (cells/L) and Individuals per square meter (Ind/m2). Biomass (μg C Ind.-1 per L and per m2) was only determined for alive individuals according to carbon contents for ice meiofauna taxa based on literature according to Marquardt et al. 2023 and references within in (https://doi.org/10.1016/j.pocean.2023.103128). Samplingevent occurrence sea-ice protist sea-ice meiofauna sympagic Central Arctic Ocean sea ice; Micro-SHIFT GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml Observation GBIF Dataset Subtype Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_subtype.xml This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License. Creative Commons Attribution 4.0 International https://spdx.org/licenses/CC-BY-4.0.html CC-BY-4.0 https://data.npolar.no/dataset/90e39c2b-fd7f-44d7-a58c-866f8dea66de North of Svalbard, Central Arctic Ocean 19.8558 21.8839 83.8528 83.1503 phylum Mollusca phylum Arthropoda family Synchaetidae family Calanidae order Amphipoda class Spirotrichea order Calanoida kingdom Chromista class Copepoda family Oithonidae class Eurotatoria phylum Rotifera order Harpacticoida order Ploima kingdom Animalia family Clionidae family Clausocalanidae order Pteropoda family Oncaeidae order Cyclopoida class Malacostraca order Tintinnida phylum Ciliophora class Gastropoda family Calliopiidae This data was collected for a master thesis at UiT The Arctic University of Norway with the title "Diversity of ice-associated fauna and mesozooplankton during a 20-day ice drift spring study in the high Arctic" by Hanna Huntscha. This study was funded by the Research Council of Norway through the project BREATHE (RCN # 325405) and the ERC StG Micro-SHIFT (No. 101162830). We would like to thank the captain and crew of RV Kronprins Haakon and the Micro-SHIFT lead scientist Karley Campbell as well as all Micro-SHIFT cruise participants that helped sampling out in the field. notPlanned Miriam Marquardt UiT The Arctic University of Norway miriam.marquardt@uit.no 0000-0003-2913-067X The dataset contains individual countas, abundance and biomass of sea-ice meiofauna (> 20 µm) including metazoans eggs and large protists such as foraminifers and ciliates. Sea-ice meiofauna were identified and counted with a stereo microscopy and results are given as Individuals per liter (cells/L) and Individuals per square meter (Ind/m2). Biomass (μg C Ind.-1 per L and per m2) was only determined for alive individuals according to carbon contents for ice meiofauna taxa based on literature according to Marquardt et al. 2023 and references within in (https://doi.org/10.1016/j.pocean.2023.103128). North of Svalbard, Central Arctic Ocean Ice cores were taken for the determination of abundance and biomass of sea-ice meiofauna and protists (lowermost 5 cm) every four days during a 20-day drift study. Three ice cores were taken from undeformed level ice areas with a KOVACS ice corer (Mark II coring system, diameter 9 cm) and were cut on the snow-free sea ice, only the 0-5 cm (bottom ice layer) section was collected. All sea-ice core sections were melted in the dark and at 4°C within 24-28 h to and to reduce negative impacts related to osmotic stress 100 ml filtered seawater (< 0.22 µm) was initially added per 1 cm section. Miriam Marquardt 0000-0003-2913-067X originator Cruise report: https://data.npolar.no/dataset/90e39c2b-fd7f-44d7-a58c-866f8dea66de This study was funded by the Research Council of Norway through the project BREATHE (RCN # 325405) and the ERC StG Micro-SHIFT (No. 101162830). North of Svalbard, Central Arctic Ocean 2026-08-24T13:35:45.806+00:00 dataset Huntscha H, Marquardt M, Svensen C (2026). Sea-ice meiofauna biodiversity from the Micro-SHIFT cruise May 2025 (cruise number: 2025007006): individual counts, abundance and biomass. Version 1.3. UiT The Arctic University of Norway. Samplingevent dataset. https://doi.org/10.21334/NPOLAR.2026.2823A0C8 Sea-ice meiofauna biodiversity from the Micro-SHIFT cruise May 2025 (cruise number: 2025007006) alcohol formalin Individuals 0 111 https://ipt.gbif.no/resource?id=sym_meio_hanna/v1.3.xml