10.25607/skulof dcae9971-8505-4eb4-a424-d81a44780b07 https://ipt.obis.org/bioecoocean/resource?r=gelatinous-zooplankton-gotland_2022 Florian Lüskow Uppsala University

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florian.luskow@geo.uu.se https://orcid.org/0000-0002-2100-7012 Elizabeth Lawrence UNESCO-IOC Project Office for IODE e.lawrence@unesco.org https://orcid.org/0000-0002-5304-941X Lina Mtwana Nordlund Uppsala University

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lina.mtwana.nordlund@geo.uu.se https://orcid.org/0000-0002-4450-2331 Elizabeth Lawrence UNESCO/IOC Project Office for IODE OBIS e.lawrence@unesco.org https://orcid.org/0000-0002-5304-941X Elizabeth Lawrence UNESCO/IOC Project Office for IODE OBIS e.lawrence@unesco.org https://orcid.org/0000-0002-5304-941X processor Lina Mtwana Nordlund Uppsala University

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lina.mtwana.nordlund@geo.uu.se https://orcid.org/0000-0002-4450-2331 principalInvestigator 2026-06-05 eng Video footage from seagrass meadows around Gotland, originally collected in 2022 to study seagrass-associated fish, was reanalyzed to estimate jellyfish (Aurelia aurita) abundance. Footage was obtained at six sites using a GoPro HERO 5 Black camera towed horizontally over seagrass-dominated soft bottoms at depths of 2.1–6.9 m. The camera, positioned 80–100 cm above the seafloor, captured transects 55 m in length during morning and evening sessions. Sixty transects were recorded, 10 transects per site, with video durations averaging 4 minutes. Jellyfish abundance was estimated by calculating the volume of water filmed, modeled as a triangular prism based on the camera’s field of view and orientation (perpendicular or tilted 70°). Additional measurements included surface and bottom temperatures, as well as wind speed and direction, retrieved from external sources. Full calculation details are provided in the associated paper, Luskow et al 2025. Samplingevent 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 Sampling sites around Gotland, Sweden 17.952 19.424 58.066 56.867 2022-08-14 2022-09-16 species Aurelia aurita Common jellyfish asNeeded Florian Lüskow Uppsala University

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florian.luskow@geo.uu.se https://orcid.org/0000-0002-2100-7012 Florian Lüskow https://orcid.org/0000-0002-2100-7012 author Lina Mtwana Nordlund https://orcid.org/0000-0002-4450-2331 principalInvestigator This project was funded by the European Union’s Horizon Europe Research and Innovation Programme under Grant Agreement No. 101136748 (BioEcoOcean). Views and opinions expressed are, however, those of the authors only and do not necessarily reflect those of the European Union or the European Research Executive Agency. Neither the European Union nor the granting authority can be held responsible for them. 2025-04-18T20:50:01.815+00:00 dataset Lüskow F, Lawrence E, Nordlund L M (2026). Gelatinous Zooplankton in Gotland, Sweden, 2022. Version 2.2. OBIS Secretariat. Samplingevent dataset. https://doi.org/10.25607/skulof Lüskow, F., Neitzel, P., Lawrence, E. R., & Mtwana Nordlund, L. (2025). Jellyfish and Ctenophores Around Gotland in the Baltic Sea—Local Data Contributing to Global Assessments. In Journal of Marine Science and Engineering (Vol. 852, Number 13). Zenodo. https://doi.org/10.3390/jmse13050852 dcae9971-8505-4eb4-a424-d81a44780b07/v2.2.xml