Polygons which delimited the geographical studied area of the CHARM I project and the CHARM II project. Polygons which delimited the geographical suggested area of the CHARM III project.

The English Channel is a biogeographical transition zone, situated between warm temperate and boreal marine province. This status enables the early detection of trends in the oceanic climate regime between two provinces. Mean SST maps for February (coldest month of the year) and August (warmest month of the year), from 1986 to 2006, were produced.

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.

chlorophyll a concentration (in g.m-3)

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.

attenuation coefficient (KPAR, m-1)

The English Channel is a biogeographical transition zone, situated between warm temperate and boreal marine province. This status enables the early detection of trends in the oceanic climate regime between two provinces. Mean SST maps for February (coldest month of the year) and August (warmest month of the year), from 1986 to 2006, were produced.

Modelised adundance of several species eggs or prediction uncertainty.

Sea Surface Temperature (SST, in °C)

Localisation of the 39 sampled sites done during the BCD survey in April 1999.