Numerous reef-forming species have declined dramatically over the last century. Many of these declines have been insufficiently documented due to anecdotal or hard-to-access information. The Ross worm Sabellaria spinulosa (L.) is a tube-building polychaete that can form large mostly subtidal reefs, providing important ecosystem services such as coastal protection and habitat provision. It ranges from Scotland to Morocco and into the Mediterranean as far as the Adriatic, yet little is known about its distribution outside of the North & Wadden Seas, where it is protected under the OSPAR & HELCOM regional sea conventions respectively. As a result, online marine biodiversity information systems currently contain haphazardly distributed records of S. spinulosa. One of the objectives of the REEHAB project (http://www.honeycombworms.org) was to combine historical records with contemporary data to document changes in the distribution and abundance of the two Sabellaria species found in Europe, S. alveolata and S. spinulosa. Here we publish the result of the curation of 555 S. spinulosa sources, gathered from literature, targeted surveys, local conservation reports, museum specimens, personal communications by authors  their research teams, national biodiversity information systems (i.e. the UK National Biodiversity Network (NBN), www.nbn.org.uk) and validated citizen science observations (i.e. https://www.inaturalist.org). 56% of these records were not previously referenced in any online information system. Additionally, historic samples from Gustave Gilson were scanned for S. spinulosa information and manually entered.   The original taxonomic identification of the 40,261 S. spinulosa records has been kept. Some identification errors may however be present, particularly in the English Channel and Mediterranean where intertidal and shallow subtidal records can be mistaken for Sabellaria alveolata. A further 229 observations (16 sources) are recorded as ‘Sabellaria spp.’ as the available information did not provide an identification down to species level. Many sources reported abundances based on the semi-quantitative SACFOR scale whilst others simply noted its presence, and others still verified both its absence and presence. The result is a curated and comprehensive dataset spanning over two centuries on the past and present global distribution and abundance of S. spinulosa. Sabellaria spinulosa records projected onto a 50km grid. When SACFOR scale abundance scores were given to occurrence records, the highest abundance value per grid cell was retained.

Serveur wms public de l'Ifremer, Accès aux données du Sismer

Donnees publiques de la Directive Cadre Strategie pour le Milieu Marin (DCSMM)

The precise location and geometry of oceanic spreading centers and associated transform faults and discontinuities boundaries has fundamental implications in our understanding of oceanic accretion, the accommodation of deformation around rigid lithospheric blocs, and the distribution of magmatic and volcanic processes. The now widely used location of mid oceanic ridges worldwide, published by P. Bird in 2003, can be updated based on recent publicly available and published ship-based multibeam swath bathymetry data (100-m resolution or better), now available to ~25% of the ocean seafloor, but covering a significant proportion of the mid-ocean ridge system (>70%). Here we publish the MAPRIDGES database built under the coordination of CGMW (Commission for the Geological Map of the World), with a second version (03/2026) that provides high resolution and up-to-date datasets of mid-ocean ridge segments and associated transform faults, and follow-up updates that will also include non-transform offsets. The detailed mapping of individual mid oceanic ridge segments was conducted using GMRT (Ryan et al., 2009) (version 4.2 and 4.3 for MAPRIDGES V2.0), other publicly available datasets (e.g., NCEI, Pangaea, AWI), and existing literature (including published maps). MAPRIDGES will be revised with the acquisition of additional datasets, new publications, and correction of any errors in the database. The MAPRIDGE database was built in a GIS environment (QGIS), where each feature has several attributes specific to the dataset. We include 4 different shapefile layers: 1) Ridge Segments, 2) Transform Faults, 3) Transform Zones. The latest corresponds to zones of distributed strike-slip deformation that lack a well-defined fault localizing strain, but that are often treated as transform faults. We also include a continuous ridge boundary for the different ridge systems, linking adjacent ridge segments. Files are provided in the GeoPackage (.gpkg) format that is non-propietary, open, and platform-independent. To facilitate revisions and updates of the database, relevant information, corrections, or data could be sent to B. Sautter (benjamin.sautter@univ-ubs.fr) and J. Escartín (escartin@geologie.ens.fr).

Long-term time series of coliform bacteria concentration (fecal coliform or Escherichia coli) in shellfish in four submarine areas (North Sea/Channel, Britany, Atlantic, Mediterranean).

Within the ESA Coastal Blue Carbon project, the LIENSs laboratory contributed drone-derived products, SP80 ground survey points (with longitude, latitude, and plant data) and biomass measurements to test classification models for mapping salt marsh vegetation (e.g., Esnandes) and associated biomass/carbon stocks. Links to associated datasets are provided at the bottom of this sheet.

The BenthOBS dataset includes long-term time series on marine benthic macrofauna, since 1967, along the whole French metropolitan coast. It includes 20 sampling location. BenthOBS aims to establish a national network for the observation of macrozoobenthos. In a context of global change, It is essential to have time series capable of highlighting and understanding ongoing changes in the specific diversity within communities and their consequences on the functioning of marine ecosystems. The BenthOBS network provides the scientific community and stackers with validated data on the following parameters: specific abundance, sediment size composition, sediment organic matter, sediment C content, sediment N content.

The Mediterranean Sea is a natural laboratory to address questions about the formation and evolution of continental margins and the relationship between surface and deep processes. Different regional to local events have influenced the Neogene stratigraphic evolution of the Valencia and Menorca basins. The evaporites deposited during the Messinian Salinity Crisis (MSC) strongly impact its sedimentary and geomorphological evolution. Here we present a compilation of the main regional seismic stratigraphic markers from the continental platform to the deep sea. We provide in xyz format (z in second twt) the original picking files, (not interpolated) and interpolated grid of: i) the top of the Mesozoic formation, the base of the Neogene formations including the early Miocene volcanic features, ii) the top Burdigalian, Langhian, and Serravallian seismic horizons, iii) the seismic horizons related to the Messinian Salinity Crisis, iv) the Pliocene and Pleistocene seismic horizons v) the depth of the Seafloor. The available reflection seismic dataset results from the compilation and processing of vintage seismic profiles of previous works and from the Instituto Geologico y Minero de Espana (IGME). This compilation is currently the first available in literature and provides a useful contribution to the scientific community working on sedimentary, tectonics and geodynamics within the Western Mediterranean basins.