f39a2450-6b86-4093-9e32-4023957cbcb4 Mickaël Vasquez Ifremer Mickael.Vasquez@ifremer.fr pointOfContact 2025-12-15T09:56:45.188218Z ISO 19115-3 - SEXTANT ISO 19115-3 - SEXTANT 1.0 4326 EPSG Zostera marina habitat suitability along French Coast in Bay of Biscay and Channel Sea Zostera marina habitat suitability along French Coast in Bay of Biscay and Channel Sea Habitat potentiel de Zostera marina le long des côtes françaises du Golfe de Gascogne et de la Manche FR004100 FR004100 2020-12-31T12:00:00 publication Zostera marina habitat suitability along French Coast in Bay of Biscay and Channel Sea DOI:10.12770/f39a2450-6b86-4093-9e32-4023957cbcb4 Ten Random Forest models were fitted in order to characterise the environmental niche and to predict the potential spatial distribution of Zostera marina along the French western seaboard. 3 rasters are provided: 1) Habitat suitability index (values ranging from 0 to 1 when conditions are estimated to be optimal), 2) standard deviation around the mean habitat suitability index, and 3) binary suitability estimates (0= not suitable, 1=suitable). These model estimates indicate areas where the species may occur and are overall consistent with field observations but note that these maps are model-based and do not correspond to actual field observations. Ifremer - Unité Dynamiques des Écosystèmes Côtiers completed Romain Mouillard Ifremer Romain.Mouillard@ifremer.fr author Martin Marzloff Ifremer Martin.Marzloff@ifremer.fr author Mickaël Vasquez Ifremer Mickael.Vasquez@ifremer.fr author Ifremer sismer@ifremer.fr publisher https://sextant.ifremer.fr/geonetwork/srv/api/records/f39a2450-6b86-4093-9e32-4023957cbcb4/attachments/image_for_sextant2.jpg Habitats and biotopes Habitats and biotopes Habitats et biotopes GEMET - INSPIRE themes, version 1.0 GEMET - INSPIRE themes, version 1.0 2018-07-27T14:39:48 publication 2018-07-27 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Zostera marina Zostera marina Zostera marina Marha Marha Marha SDM SDM SDM HSM HSM HSM Habitat suitability modeled map Habitat suitability modeled map Carte modélisée de l'habitat potentiel Bay of Biscay Bay of Biscay Golfe de Gascogne Channel Sea Channel Sea Manche Marine Strategy Framework Directive (MSFD) Marine Strategy Framework Directive (MSFD) Directive Cadre Stratégie pour le Milieu Marin (DCSMM) Cadre Réglementaire - SIMM Cadre Réglementaire - SIMM 2025-12-09 publication geonetwork.thesaurus.local.theme.simm.reglementaire /Metropolitan France/Channel-North Sea /Metropolitan France/Channel-North Sea /Métropole/Manche mer du Nord /Metropolitan France/Bay of Biscay /Metropolitan France/Bay of Biscay /Métropole/Golfe de Gascogne /Metropolitan France/Celtic Seas /Metropolitan France/Celtic Seas /Métropole/Mers Celtiques Sous-regions marines Sous-regions marines 2025-12-09 publication geonetwork.thesaurus.local.place.dcsmm.area /Environmental Status/Habitats /Environmental Status/Habitats /Etat du Milieu/Habitats Research Research Recherche Thématiques - SIMM Thématiques - SIMM 2025-12-09 publication geonetwork.thesaurus.local.theme.simm.thematiques Seagrass Seagrass Herbiers Benthic habitats Benthic habitats Habitats benthiques ODATIS aggregation parameters and Essential Variable names ODATIS aggregation parameters and Essential Variable names 2025-07-29 publication geonetwork.thesaurus.external.theme.NVS.OD1 Simulation data Simulation data Données de simulation Type de jeux de donnée ODATIS Type de jeux de donnée ODATIS 2025-12-09 publication geonetwork.thesaurus.local.theme.type_jeux_donnee no limitations to public access no limitations to public access Product under creative common license CC BY-NC-SA: https://creativecommons.org/licenses/by-nc-sa/4.0/ Product under creative common license CC BY-NC-SA: https://creativecommons.org/licenses/by-nc-sa/4.0/ Citation in bibliography should be as follows: Romain Mouillard, Martin Marzloff, Mickaël Vasquez (2020). Zostera marina habitat suitability along French Coast in Bay of Biscay and Channel Sea. Ifremer. https://doi.org/10.12770/f39a2450-6b86-4093-9e32-4023957cbcb4 Citation in bibliography should be as follows: Romain Mouillard, Martin Marzloff, Mickaël Vasquez (2020). Zostera marina habitat suitability along French Coast in Bay of Biscay and Channel Sea. Ifremer. https://doi.org/10.12770/f39a2450-6b86-4093-9e32-4023957cbcb4 grid 0.004501612 utf8 oceans biota -6.453353468 2.6128931 43.298063693 51.000321825 2021-01-01T12:00:00Z 2021-01-01T12:00:00Z https://archimer.ifremer.fr/doc/00667/77870/ https://archimer.ifremer.fr/doc/00667/77870/ WWW:LINK MSc thesis: Mouillard Romain (2020). Modélisation statistique de la distribution spatiale des espèces Zostera marina et Zostera noltei à l'échelle de la façade Manche-Atlantique. Mémoire de fin d’études d’Ingénieur Agronome, spécialité « Sciences halieutiques et aquacoles » préparée à Agrocampus Ouest. Option « Ressources et Ecosystèmes Aquatiques ». https://doi.org/10.12770/f39a2450-6b86-4093-9e32-4023957cbcb4 https://doi.org/10.12770/f39a2450-6b86-4093-9e32-4023957cbcb4 DOI DOI of the dataset DOI of the dataset DOI of the dataset https://sextant.ifremer.fr/services/wms/biologie? https://sextant.ifremer.fr/services/wms/biologie? OGC:WMS IFR_ZOSTERA_MARINA_HABITAT_SUITABILITY Zostera marina habitat suitability Zostera marina habitat suitability COPYFILE IFR_ZOSTERA_MARINA_HABITAT_SUITABILITY Zostera marina habitat suitability Zostera marina habitat suitability https://sextant.ifremer.fr/services/wms/biologie? https://sextant.ifremer.fr/services/wms/biologie? OGC:WMS IFR_ZOSTERA_MARINA_HABITAT_SUITABILITY_SD Zostera marina habitat suitability - Standard Deviation Zostera marina habitat suitability - Standard Deviation COPYFILE IFR_ZOSTERA_MARINA_HABITAT_SUITABILITY_SD Zostera marina habitat suitability - Standard Deviation Zostera marina habitat suitability - Standard Deviation https://sextant.ifremer.fr/services/wms/biologie? https://sextant.ifremer.fr/services/wms/biologie? OGC:WMS IFR_ZOSTERA_MARINA_BINARY_HABITAT_SUITABILITY Zostera marina habitat suitability - Binary Zostera marina habitat suitability - Binary FILE IFR_ZOSTERA_MARINA_BINARY_HABITAT_SUITABILITY Zostera marina habitat suitability - Binary Zostera marina habitat suitability - Binary Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication See the referenced specification See the referenced specification true COMMISSION REGULATION (EC) No 1205/2008 of 3 December 2008 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards metadata COMMISSION REGULATION (EC) No 1205/2008 of 3 December 2008 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards metadata 2008-12-04 publication See the referenced specification See the referenced specification true Bathymetry, KdPar, sea surface temperature, fetch, current velocity and other variables were used as predictors. Random forest models were fitted and evaluated using N=393 Zostera marina presence-only data. 10 sets of N pseudo-absences were randomly drawn to consolidate 10 alternative presence/pseudo-absence datasets. 79 occurrences (20% of N) and 79 pseudo-absence were set aside for independent model validation. To capture results sensitivity to pseudo-absences, 10 Random Forest models were fitted on each dataset. Coastwide extensive rasters of the predictors were used to predict habitat suitability along the French Atlantic and English Channel coastline using each model. An Ensemble modelling approach was used to produce a single mean habitat suitability estimate using a weighted mean across individual model predictions based on goodness-of-fit as assessed by the Area Under the receiver-operating Curve (AUC). Standard deviation around the mean habitat suitability index corresponds to the standard deviation across the 10 model estimates. Habitat suitability estimates were classified into binary 0/1 predictions according to model-specific threshold using the validation dataset and the specificity=sensitivity optimisation criteria. The dominant mode across the ten model binary estimates is presented in the binary habitat suitability index raster. In a final step, as Zostera marina cannot settle on hard bottoms, rock polygons from EMODnet Geology’s seabed substrate product were used to post-process the raster products as follows: in cells where rock is present, the two habitat suitability indices were set to 0, and the standard deviation set to NA. Presence records: Zostera marina occurrence datasets were collated across a range of local studies completed by different organisations (e.g. Ifremer, French Office of Biodiversity, Marine Nature Parks, universities) in the context of different ecological monitoring initiatives (Natura 2000 network, OSPAR, CARTHAM project, REBENT network etc.). All observations (surface and point) regardless of the sampling technique (e.g. aerial photos, diving etc.) were considered over the recent period, i.e. 2000 to 2016 (older records were discarded). Environmental variables: eight covariates were used to fit the Random Forest models as described below. -depth: EMODnet Bathymetry 100m DTM -KdPAR (diffuse attenuation coefficient of downwelling photosynthetically available radiation, proxy of water transparency): EMODnet Seabed Habitat data product, spatial resolution 250m, averaged values (temporal coverage 5 years -2005-2009, temporal resolution 1 day) -PAR (photosynthetically active radiation): EMODnet Seabed Habitat data product, spatial resolution 4000m, averaged values (temporal coverage 5 years -2005-2009, temporal resolution 1 day) -Fetch: Burrows Wave fetch GIS layers for Europe, spatial resolution 100m (https://doi.org/10.6084/m9.figshare.8668127) -Chlorophyll-a, phosphate, nitrate, dissolved oxygen: Ifremer MARC archive, spatial resolution 4000m, averaged values (temporal coverage 7 years -2012-2018, temporal resolution 1 day) -air temperature: Arome – Météo France archive, spatial resolution 1000m, averaged values (temporal coverage 7 years -2012-2018, temporal resolution 1 hour) -Tidal current velocity, water temperature, salinity: Ifremer MARC archive, spatial resolution 500m, averaged values (temporal coverage 6 years, 2010-2015, temporal resolution 1 hour) -Wave energy: Ifremer Homère archive, spatial resolution 300m, Percentile 90th values (temporal coverage 6 years, 2010-2015, temporal resolution 1 hour)