d34fc0d7-3ef5-49df-b626-908d76e28f75 eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2025-03-05 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Macrobenthic assemblages from the methane seeps in six South Georgia troughs collected in 2017 2025-03-05 creation 2025-03-05 revision 2025-03-05 publication 2025-03-05 released 1.0 https://doi.org/10.5285/d34fc0d7-3ef5-49df-b626-908d76e28f75 doi GB/NERC/BAS/PDC/02028 https://data.bas.ac.uk/ NE/S007431/1 award Please cite this item as: Anderson, M., Pape, T., & Linse, K. (2025). Macrobenthic assemblages from the methane seeps in six South Georgia troughs collected in 2017 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/d34fc0d7-3ef5-49df-b626-908d76e28f75 In 2017, the RV METEOR M134 expedition investigated macrobenthic assemblages associated with methane seeps on the South Georgia continental shelf. Six shelf troughs with active methane seepage were sampled to assess species richness, abundance, and environmental conditions. Data were collected from eleven shelf stations, with species richness ranging from 19 to 51 species and abundances from 3,303 to 30,326 individuals per square meter. A total of 103 species were identified, with arthropods (primarily crustaceans) and annelids comprising most of the species richness. Environmental data include methane and sulfate flux, hydrogen sulfide concentrations, and sediment geochemistry. Seep assemblage data is combined with data from non-seep benthic communities from other expeditions.The dataset provides: 1) South Georgia methane seep station locations and environmental data. 2) Macrobenthic species absolute and normalized abundances at seep sites. 3) A combination of seep assemblages with non-seep benthic communities from other expeditions. Funding: The fieldwork for this study, was supported by the Deutsche Forschungsgemeinschaft (DFG) in the framework of the priority programme 'Antarctic Research with comparative investigations in Arctic ice areas' (project-id 40464014) and within the DFG-Research Center/Cluster of Excellence EXC 309 'The Ocean in the Earth System' (project-id 49926684). The expedition, titled 'Emissions of free gas around South Georgia: distribution, quantification, and sources for methane ebullition sites in sub-Antarctic waters,' was supported by MARUM - Center for Marine Environmental Sciences, Research Faculty University of Bremen, and the University of Bremen. Additional support came from the Helmholtz Association (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven). The cruise was funded by the German Research Foundation (DFG) and the Federal Ministry of Education and Research (BMBF). Katrin Linse is part of the British Antarctic Survey Polar Science for Planet Earth Programme (NC Science), funded by the Natural Environment Research Council (NERC). Studies around South Georgia were conducted under permit RAP 129/2016 (M134) issued by the Foreign & Commonwealth Office, UK. Macrobenthic faunal sorting was supported by the Natural Environment Research Council through a DEI Internship for Madeline PBC Anderson (via the NERC Diversity, Equity and Inclusion engagement funding) and an IAPETUS2 PhD studentship held by Madeline PBC Anderson (grant reference NE/S007431/1). No credit. completed Anderson, Madeline British Antarctic Survey Researcher author Pape, Thomas University of Bremen Researcher author Linse, Katrin British Antarctic Survey Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Biosphere > Aquatic Habitat > Benthic Habitat EARTH SCIENCE > Oceans > Marine Biology > Marine Invertebrates EARTH SCIENCE > Oceans > Marine Biology theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher South Georgia Sub-Antarctic hydrocarbon seafloor emission macrobenthic methane seep multicorer (MUC) samples theme South Georgia Antarctica place Habitats and biotopes Oceanographic geographical features theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions This data is governed by the NERC Data Policy: https://www.ukri.org/who-we-are/nerc/our-policies-and-standards/nerc-data-policy/ otherRestrictions This data is governed by the NERC data policy and supplied under Open Government Licence v.3 otherRestrictions None url url crossReference url url crossReference url url crossReference textTable eng utf8 biota -65.36666 -30.30383 -76.09883 -53.77015 2017-01-21 2017-02-09 It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor text/csv text/plain bytes 83968 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=d34fc0d7-3ef5-49df-b626-908d76e28f75 WWW:LINK-1.0-http--link Get Data Download data download bytes 83968 http://ramadda.data.bas.ac.uk/repository/entry/show?entryid=d34fc0d7-3ef5-49df-b626-908d76e28f75 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: Oceanographic data were collected using RV METEOR's 24 x 10 L Niskin bottle rosette with a Seabird CTD equipped with conductivity, temperature, pressure, and an SBE 43 dissolved oxygen sensor. The near seafloor water data were used to report bottom temperature, salinity, and oxygen. Seafloor sediment cores and macrobenthic assemblages were obtained with a multicorer (MUC) (OKTOPUS GmbH), comprising eight 10 cm diameter and four 6 cm diameter cores per deployment. On arrival on deck, cores were photographed to document sediment height, layering, and colour before being distributed for geochemical, sediment, and biological analyses. Water depth of sediment recovery ranged from 136 m (Cumberland East Bay station CB 07) to 369 m (Church Trough station CT 05). MUC cores allocated for macrobiology (a total of 38) were sliced into 0-2 cm and 2-5 cm horizons using a core extruder, sieved through a 500 micrometer mesh, and preserved in 96 percent ethanol. Specimens were initially sorted to higher taxonomic levels onboard using a Meiji stereomicroscope, then further sorted to morphospecies on land under a Zeiss Stemi SV6 stereomicroscope. Photographs were taken using ScopeTek ScopePhoto 3.1.475, and taxonomic identifications were verified by experts using literature (Arntz and Rauschert, 2015). Due to identification challenges, nematodes were grouped into a single taxon, and indeterminate specimens were marked as 'indet.'. Only individuals with heads were counted to prevent duplication. Abundance data were scaled to m squared for quantitative analyses. Patterns in species richness, abundance, and diversity were assessed by pooling cores per MUC deployment to obtain an assemblage per core. Abundance data were summed at the phylum level and scaled for comparisons between stations. Species richness was verified with a species accumulation curve to ensure observed richness was not an artifact of sampling effort. Data have been combined with other comparable species/polychaete Southern Ocean non-seep assemblage datasets (see references for the publications used). MUC coring was also used for macrofaunal sampling in these studies - full details of sampling can be found in those publications. Data collection: 1. RV METEOR's 24 x 10 L Niskin bottle rosette - Equipped with a Seabird CTD (Conductivity, Temperature, Depth) sensor. Sensors: Conductivity (psu) Temperature (degCel) Pressure - Depth (m) SBE 43 dissolved oxygen sensor (mLL-10) 2. Multicorer (MUC) (OKTOPUS GmbH) - Used for seafloor sediment and macrobenthic assemblage collection. Core sizes: Eight 10 cm diameter cores Four 6 cm diameter cores 3. Stereomicroscopes: Meiji stereomicroscope - Used onboard for initial macrofaunal sorting. Zeiss Stemi SV6 stereomicroscope - Used in the laboratory for further taxonomic sorting. 4. Core Extruder: Used for sediment slicing at 0-2 cm and 2-5 cm horizons. 5. 500 micrometer sieve - Used for sieving sediment samples on deck. Data quality: NA in Environmental_parameters.csv data - data were not collected Indet - the abbreviation 'indet.' was used to denote an indeterminate specimen. Species were identified to highest taxonomic level possible, and quality checking occurred for consistency in identification. Specialists were contacted to assist in identification for specific taxa. asNeeded completed