Biologic data have been expressed in abundance (numbers or density values (nbr/km²)) and always required to be log-transformed using a log10(x+1) transformation.

Temperature and salinity were measured, in situ at sea surface and at bottom during the IBTS surveys from 1980 to 2010 . Temperature and salinity were measured using CTD probe. The IBTS survey, which takes place each year in January, gives a good illustration of winter conditions.

Modelised adundance of several species eggs or prediction uncertainty.

Modelised abundances of several species in coastal nurseries or prediction uncertainty.

Three environmental parameters were measured in situ during the REISE2 survey in April 1995. Temperature and salinity were measured using a probe. Fluorescence (mean for the water column) was measured using a fluorometer. This survey gives illustration of spring conditions.

Modelised abundance of species or prediction uncertainty.

Biological data have been expressed in abundance (number of individuals per 20 m3).

Species habitat occupation has been expressed as rare, occasional, frequent, recurrent depending on density levels and variability over time.

Species habitat occupation, observed during the first quarter IBTS from 1980 to 2010, has been expressed as rare, occasional, frequent, recurrent depending on density levels and variability over time.

Biologic data have been expressed in abundance (numbers or density values (nbr/km²)) and always required to be log-transformed using a log10(x+1) transformation.