Biomass distribution of megabenthic invertebrates sensitive to bottom trawling and associated uncertainties

Two types of products are available for 30 sensitive megabenthic invertebrates :

1- Biomass distribution of the taxa interpolated by kriging across trawlable soft bottoms of the Mediterranean (10–1000 m depth): "[taxa]_bd.tif"

2- Kriging uncertainties associated with each biomass distribution interpolation: "[taxa]_un.tif"

***These layers are associated with the report: Millot Jade, Vaz Sandrine, Lauria Valentina (2026). Sensitivity of megabenthic invertebrate communities to bottom trawling in the Mediterranean based on biological traits. RBE/MARBEC/LHM. https://doi.org/10.13155/117327***

Date (Publication): 2025-10-07

Identifier: https://sextant.ifremer.fr/record/b7c5d984-bae7-4655-b287-c47855d6c197

Credit: Ifremer

Author

Ifremer - Jade Millot

Author

IFREMER - Vaz Sandrine ( PDG-DGDS-RBE-MARBEC-LHM )

04 99 57 32 12

Publisher

IFREMER - Sextant

Thèmes Sextant

/Milieu biologique/Habitats

GEMET - INSPIRE themes, version 1.0

Habitats et biotopes

Keywords

Use limitation: CC-BY (Creative Commons - Attribution)

Access constraints: Other restrictions

Use constraints: License

Other constraints: We do our best to ensure that the data is complete, accurate and useful. However, because the processing required to generate the data is complex, we cannot be liable for omissions or inaccuracies. The data and any related materials contained therein are provided “as is”, without warranty of any kind, either expressed or implied, including but not limited to, fitness for a particular purpose, non-interference, system integration, or non-infringement. The entire risk of use of the data shall be with the user.

Unique resource identifier: 10.17600/96060020

Association Type: Cross reference

Initiative Type: Platform

Unique resource identifier: da33d0b4-f208-4a85-bc62-478a2a7fdf68

Association Type: Larger work citation

Unique resource identifier: 10.13155/117327

Association Type: Cross reference

Initiative Type: Study

Unique resource identifier: seanoe:104981

Association Type: Larger work citation

Spatial representation type: grid Grid

Distance: 0.05 °

Metadata language: Français

Character set: utf8 UTF8

Topic category

Oceans
Environment

Begin date: 2012-01-01

End date: 2021-01-01

Unique resource identifier: EPSG:4326

Number of dimensions: 4

Dimension name: Time

Dimension name: Vertical

Dimension name: Column

Dimension size: 1075

Resolution: 0.05 °

Dimension name: Row

Dimension size: 400

Resolution: 0.05 °

Cell geometry: surface

Transformation parameter availability: No

Distribution format

OnLine resource: Alcyonium_spp_biomass_distribution_MEDITS ( OGC:WMS )
Alcyonium spp - Biomass distribution

OnLine resource: Alcyonium_spp_uncertainties_MEDITS ( OGC:WMS )
Alcyonium spp - Kriging uncertainties

OnLine resource: Anomia_ephippium_biomass_distribution_MEDITS ( OGC:WMS )
Anomia ephippium - Biomass distribution

OnLine resource: Anomia_ephippium_uncertainties_MEDITS ( OGC:WMS )
Anomia ephippium - Kriging uncertainties

OnLine resource: Antedon_spp_biomass_distribution_MEDITS ( OGC:WMS )
Antedon spp - Biomass distribution

OnLine resource: Antedon_spp_uncertainties_MEDITS ( OGC:WMS )
Antedon spp - Kriging uncertainties

OnLine resource: Ascidia_spp_biomass_distribution_MEDITS ( OGC:WMS )
Ascidia spp - Biomass distribution

OnLine resource: Ascidia_spp_uncertainties_MEDITS ( OGC:WMS )
Ascidia spp - Kriging uncertainties

OnLine resource: Ascidiella_spp_biomass_distribution_MEDITS ( OGC:WMS )
Ascidiella spp - Biomass distribution

OnLine resource: Ascidiella_spp_uncertainties_MEDITS ( OGC:WMS )
Ascidiella spp - Kriging uncertainties

OnLine resource: Atrina_spp_biomass_distribution_MEDITS ( OGC:WMS )
Atrina spp - Biomass distribution

OnLine resource: Atrina_spp_uncertainties_MEDITS ( OGC:WMS )
Atrina spp - Kriging uncertainties

OnLine resource: Axinella_spp_biomass_distribution_MEDITS ( OGC:WMS )
Axinella spp - Biomass distribution

OnLine resource: Axinella_spp_uncertainties_MEDITS ( OGC:WMS )
Axinella spp - Kriging uncertainties

OnLine resource: Ciona_spp_biomass_distribution_MEDITS ( OGC:WMS )
Ciona spp - Biomass distribution

OnLine resource: Ciona_spp_uncertainties_MEDITS ( OGC:WMS )
Ciona spp - Kriging uncertainties

OnLine resource: Diazona_violacea_biomass_distribution_MEDITS ( OGC:WMS )
Diazona violacea - Biomass distribution

OnLine resource: Diazona_violacea_uncertainties_MEDITS ( OGC:WMS )
Diazona violacea - Kriging uncertainties

OnLine resource: Funiculina_quadrangularis_biomass_distribution_MEDITS ( OGC:WMS )
Funiculina quadrangularis - Biomass distribution

OnLine resource: Funiculina_quadrangularis_uncertainties_MEDITS ( OGC:WMS )
Funiculina quadrangularis - Kriging uncertainties

OnLine resource: Gryphus_vitreus_biomass_distribution_MEDITS ( OGC:WMS )
Gryphus vitreus - Biomass distribution

OnLine resource: Gryphus_vitreus_uncertainties_MEDITS ( OGC:WMS )
Gryphus vitreus - Kriging uncertainties

OnLine resource: Halocynthia_papillosa_biomass_distribution_MEDITS ( OGC:WMS )
Halocynthia papillosa - Biomass distribution

OnLine resource: Halocynthia_papillosa_uncertainties_MEDITS ( OGC:WMS )
Halocynthia papillosa - Kriging uncertainties

OnLine resource: Isidella_elongata_biomass_distribution_MEDITS ( OGC:WMS )
Isidella elongata - Biomass distribution

OnLine resource: Isidella_elongata_uncertainties_MEDITS ( OGC:WMS )
Isidella elongata - Kriging uncertainties

OnLine resource: Leptometra_spp_biomass_distribution_MEDITS ( OGC:WMS )
Leptometra spp - Biomass distribution

OnLine resource: Leptometra_spp_uncertainties_MEDITS ( OGC:WMS )
Leptometra spp - Kriging uncertainties

OnLine resource: Lytocarpia_myriophyllum_biomass_distribution_MEDITS ( OGC:WMS )
Lytocarpia myriophyllum - Biomass distribution

OnLine resource: Lytocarpia_myriophyllum_uncertainties_MEDITS ( OGC:WMS )
Lytocarpia myriophyllum - Kriging uncertainties

OnLine resource: Microcosmus_spp_biomass_distribution_MEDITS ( OGC:WMS )
Microcosmus spp - Biomass distribution

OnLine resource: Microcosmus_spp_uncertainties_MEDITS ( OGC:WMS )
Microcosmus spp - Kriging uncertainties

OnLine resource: Mimachlamys_spp_biomass_distribution_MEDITS ( OGC:WMS )
Mimachlamys spp - Biomass distribution

OnLine resource: Mimachlamys_spp_uncertainties_MEDITS ( OGC:WMS )
Mimachlamys spp - Kriging uncertainties

OnLine resource: Mytilus_spp_biomass_distribution_MEDITS ( OGC:WMS )
Mytilus spp - Biomass distribution

OnLine resource: Mytilus_spp_uncertainties_MEDITS ( OGC:WMS )
Mytilus spp - Kriging uncertainties

OnLine resource: Nemertesia_spp_biomass_distribution_MEDITS ( OGC:WMS )
Nemertesia spp - Biomass distribution

OnLine resource: Nemertesia_spp_uncertainties_MEDITS ( OGC:WMS )
Nemertesia spp - Kriging uncertainties

OnLine resource: Neopycnodonte_cochlear_biomass_distribution_MEDITS ( OGC:WMS )
Neopycnodonte cochlear - Biomass distribution

OnLine resource: Neopycnodonte_cochlear_uncertainties_MEDITS ( OGC:WMS )
Neopycnodonte cochlear - Kriging uncertainties

OnLine resource: Ostrea_spp_biomass_distribution_MEDITS ( OGC:WMS )
Ostrea spp - Biomass distribution

OnLine resource: Ostrea_spp_uncertainties_MEDITS ( OGC:WMS )
Ostrea spp - Kriging uncertainties

OnLine resource: Parastichopus_regalis_biomass_distribution_MEDITS ( OGC:WMS )
Parastichopus regalis - Biomass distribution

OnLine resource: Parastichopus_regalis_uncertainties_MEDITS ( OGC:WMS )
Parastichopus regalis - Kriging uncertainties

OnLine resource: Pennatula_spp_biomass_distribution_MEDITS ( OGC:WMS )
Pennatula spp - Biomass distribution

OnLine resource: Pennatula_spp_uncertainties_MEDITS ( OGC:WMS )
Pennatula spp - Kriging uncertainties

OnLine resource: Phallusia_mammillata_biomass_distribution_MEDITS ( OGC:WMS )
Phallusia mammillata - Biomass distribution

OnLine resource: Phallusia_mammillata_uncertainties_MEDITS ( OGC:WMS )
Phallusia mammillata - Kriging uncertainties

OnLine resource: Polycarpa_spp_biomass_distribution_MEDITS ( OGC:WMS )
Polycarpa spp - Biomass distribution

OnLine resource: Polycarpa_spp_uncertainties_MEDITS ( OGC:WMS )
Polycarpa spp - Kriging uncertainties

OnLine resource: Pteria_hirundo_biomass_distribution_MEDITS ( OGC:WMS )
Pteria hirundo - Biomass distribution

OnLine resource: Pteria_hirundo_uncertainties_MEDITS ( OGC:WMS )
Pteria hirundo - Kriging uncertainties

OnLine resource: Pteroeides_griseum_biomass_distribution_MEDITS ( OGC:WMS )
Pteroeides griseum - Biomass distribution

OnLine resource: Pteroeides_griseum_uncertainties_MEDITS ( OGC:WMS )
Pteroeides griseum - Kriging uncertainties

OnLine resource: Suberites_spp_biomass_distribution_MEDITS ( OGC:WMS )
Suberites spp - Biomass distribution

OnLine resource: Suberites_spp_uncertainties_MEDITS ( OGC:WMS )
Suberites spp - Kriging uncertainties

OnLine resource: Tethya_spp_biomass_distribution_MEDITS ( OGC:WMS )
Tethya spp - Biomass distribution

OnLine resource: Tethya_spp_uncertainties_MEDITS ( OGC:WMS )
Tethya spp - Kriging uncertainties

OnLine resource: Veretillum_cynomorium_biomass_distribution_MEDITS ( OGC:WMS )
Veretillum cynomorium - Biomass distribution

OnLine resource: Veretillum_cynomorium_uncertainties_MEDITS ( OGC:WMS )
Veretillum cynomorium - Kriging uncertainties

Protocol: COPYFILE

Name: biomass_distribution

Description: Biomass distribution of the taxa interpolated by kriging across trawlable soft bottoms of the Mediterranean (10–1000 m depth)

Function: Download

Protocol: COPYFILE

Name: kriging_uncertainties

Description: Kriging uncertainties associated with each biomass distribution interpolation

Function: Download

OnLine resource: Digital Object Identifier (DOI) ( DOI )

Hierarchy level: Dataset

Domain consistency

Conformance result

Date (Publication): 2010-12-08

Explanation: See the referenced specification

Pass: No

Statement: 1- Megabenthic invertebrate taxa collected during the MEDITS survey were scored according to their sensitivity to bottom trawling, based on biological trait assessment informed by expert knowledge (e.g., position in the sediment, mobility, adult size, fragility, feeding mode, and longevity).

2- The 30 taxa with the highest sensitivity scores were selected for further analysis.

3- Biomass data (g/km²) were log-transformed to limit the influence of extreme values.

4- Semi-variogram optimization was performed by testing several combinations of initial parameters, including minimum and maximum separation lag, minimum and maximum separation distance, and stepwise increment. Three models were fitted, and the best model was selected based on three evaluation metrics: highest R², lowest mean absolute error (MAE), and lowest Akaike Information Criterion (AIC).

5- The biomass distributions of the 30 selected taxa were then interpolated using kriging based on the best-fitting semi-variogram model and rasterized to a finer resolution of 0.05°.

6- Kriging uncertainty was assessed by a measure of interpolation error (i.e., kriging variance): the initial resolution of 0.1° was kept for these products.

Further details on the data and methods can be found in the associated report.