df5a517f-e1b6-4a3a-b2a6-c6c9da38e7f1 https://ipt.gbif.no/resource?r=schramm2026_sgd_svalbard_benthos SGD_svalbard_macrofauna Ms Johanna Schramm UNIS (University Centre in Svalbard)

Longyearbyen Svalbard N-9171 NO

johanna.schramm@gmx.de Mr Wei-Li Hong Department of Geological Sciences, Stockholm University

Stockholm Stockholms län 10691 SE

wei-li.hong@geo.su.se Ms Sophie ten Hietbrink Department of Geological Sciences, Stockholm University

Stockholm Stockholms län 10691 SE

sophie.ten.hietbrink@geo.su.se Ms Beata Szymczycha Institute of Oceanology Polish Academy of Sciences

Sopot Pomerania 81-712 PL

beatsz@iopan.pl Mr Jochen Knies Geological Survey of Norway (NGU)

Trondheim Trøndelag 7491 NO

jochen.knies@ngu.no Ms Arunima Sen UNIS (University Centre in Svalbard)

Longyearbyen Svalbard N-9171 NO

arunimas@unis.no 2026-06-05 eng This dataset contains macrobenthic occurrence data collected in March 2023 from onboard the research vessel Kronprins Haakon as part of the ArcticSGD project. The study investigated the influence of submarine groundwater discharge (SGD) on benthic macrofaunal communities in Svalbard fjords, Arctic Norway. Sampling took place at three SGD sites: Tempelfjorden inner basin (T SGD; 78.4 m water depth), Murdoch Hole (M SGD; 39.5 m water depth), and Hornsund (H SGD; 117 m water depth), and one cold seep site on the Hornsundbanken shelf (HB; 126 m water depth). At the Hornsundbanken seep, samples were taken from two microhabitats: microbial mats (HB mats) and regular seep sediment (HB reg).At the two Tempelfjorden sites, two replicate sediment cores (9 cm diameter) were collected using a GEMAX corer. At Hornsund and Hornsundbanken, three replicate push cores (8.5 cm diameter) were taken using the remotely operated vehicle (ROV) Ægir 6000. Sediment cores were sieved over a 0.5 mm mesh and immediately preserved in 4% buffered formaldehyde, then transferred to 70% ethanol in the laboratory. Macrofauna were sorted under a Leica MZ16 A stereomicroscope and identified to the lowest taxonomic level, typically species level. The number of individuals for each taxon was counted and abundance standardized to m². Wet weight was determined after blotting on a scale resolving to 0.001 g, and biomass was also standardized to m². Occurrence 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 GCMDSK:LOCATIONS > OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > SVALBARD AND JAN MAYEN GCMDSK:EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > GLACIAL LANDFORMS > FJORDS GCMDSK:EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC GCMDSK:GCMD Science Keywords:https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords 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://ipt.gbif.no/archive.do?r=schramm2026_sgd_svalbard_benthos Svalbard fjords, Arctic Norway. Sampling sites were located in Tempelfjorden (T SGD; 78.4 m, M SGD; 39.5 m), Hornsund fjord (H SGD; 117 m), and on the Hornsundbanken shelf (HB; 126 m). 14.1604 17.139164 78.428828 76.793 2023-03-03 2023-03-06 N/A phylum Mollusca phylum Arthropoda phylum Bryozoa phylum Annelida phylum Echinodermata notPlanned Ms Johanna Schramm UNIS (University Centre in Svalbard)

Longyearbyen Svalbard N-9171 NO

johanna.schramm@gmx.de Ms Arunima Sen UNIS (University Centre in Svalbard)

Longyearbyen Svalbard N-9171 NO

arunimas@unis.no Sediment cores were sieved over a 0.5 mm mesh, preserved in 4% buffered formaldehyde, and transferred to 70% ethanol in the laboratory. Macrofauna were sorted under a Leica MZ16 A stereomicroscope and identified to the lowest taxonomic level. Svalbard fjords, Arctic Norway. Sampling was conducted in March 2023 at three submarine groundwater discharge sites in Tempelfjorden and Hornsund, and one cold seep site on the Hornsundbanken shelf. Sediment cores were collected using a GEMAX corer (9 cm diameter, two replicates) at Tempelfjorden sites, and push cores (8.5 cm diameter, three replicates) using the ROV Ægir 6000 at Hornsund and Hornsundbanken. Cores were sieved over a 0.5 mm mesh and preserved in 4% buffered formaldehyde. Macrofauna were sorted under a stereomicroscope and identified to the lowest taxonomic level. Abundance and biomass were standardized to m². All taxa were identified to the lowest possible taxonomic level and scientific names verified against the World Register of Marine Species (WoRMS). Arunima Sen Data collected as part of the ArcticSGD project, investigating submarine groundwater discharge and its effects on benthic communities in Svalbard fjords. The research leading to these results received funding from the Norwegian Financial Mechanism 2014–2021 project no. 2019/34/H/ST10/00645. W.H also acknowledges the support from the Swedish Research Council (VR) under the project "Cyrosphere-driven submarine groundwater in the Arctic" (Project No: 2021-04962) and STINT through the project Cryosphere-driven submarine groundwater discharge across the Scandinavian peninsula since the Last Glacial Maximum (IB2022-9230). 2026-06-04T14:52:00.210+00:00 dataset Schramm J, Hong W, ten Hietbrink S, Szymczycha B, Knies J, Sen A (2026). Macrofauna associated with submarine groundwater discharge sites and a cold seep in Svalbard fjords. Version 1.6. The University Centre in Svalbard. Occurrence dataset. https://ipt.gbif.no/resource?r=schramm2026_sgd_svalbard_benthos&v=1.6 df5a517f-e1b6-4a3a-b2a6-c6c9da38e7f1/v1.6.xml