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IFREMER
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Station de Sète - Avenue Jean Monnet - CS 30171 - 34203 Sète Cedex Sete - France
IFREMER
Publisher
Station de Sète - Avenue Jean Monnet - CS 30171 - 34203 Sète Cedex Sete - France
IFREMER
Author
Station de Sète - Avenue Jean Monnet - CS 30171 - 34203 Sète Cedex Sete - France
IFREMER
Author
Station Ifremer de Dinard - CRESCO - 38 rue du Port Blanc - BP 70134 - 35801 Dinard Cedex Dinard - France

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IFREMER

English Channel process-driven seafloor habitat sensitivity

Type: datasetLicense: not specifiedCategory: environmentLast update: unknown

Process-driven seafloor habitat sensitivity (PDS) has been defined from the method developed by Kostylev and Hannah (2007), which takes into account physical disturbances and food availability as structuring factors for benthic communities. It is a conceptual model, relating species’ life history traits to environmental properties. Physical environment maps have been converted into a map of benthic habitat types, each supporting species communities with specific sensitivity to human pressures. It is based on two axes of selected environmental forces. The "Disturbance" (Dist) axis reflects the magnitude of change (destruction) of habitats (i.e. the stability through time of habitats), only due to natural processes influencing the seabed and which are responsible for the selection of life history traits. The "Scope for Growth" (SfG) axis takes into account environmental stresses inducing a physiological cost to organisms and limiting their growth and reproduction potential. This axis…

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Data origin:

The intensity of friction was computed by combining:

  • depth: data issued from the CHARM project, i.e. that depth is presented as bathymetry (derived from SHOM navigation charts, transformed in raster of 1 km spatial resolution) plus mean sea level (issued from MARD 3D hydrodynamic model, also transformed in raster of 1 km spatial resolution);
  • waves: data coming from NORGAS model and compiled from year 2007 to 2009. The model has a resolution of 2’, i.e. 3.5 km. Temporal resolution is 3 hours. Significant period and height used are issued from the 90th percentile;
  • tidal currents: data coming from 3D MANGA model (Previmer, Ifremer) and compiled from year 2004 to 2007. The spatial resolution is about 4 km and the temporal resolution is one hour. Data were used to compute first the daily average, then the 90th percentile of the bottom currents over the available period.
  • Since hydrodynamic forces bring few changes to the sedimentary cover, a sediment mean grain size map was…
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