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

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.

Modelised abundance of species or prediction uncertainty.

Modelised adundance of several species eggs or prediction uncertainty.

Modelised abundance of species or prediction uncertainty.

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.

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.

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.