where p is the parameter, M the volume or in some case the carbon content (either in pgC or mmol C, see table 1), b the exponent describing the size dependence. As in the previous studies using DARWIN, a can be the same for a whole functional group and change between groups. When it comes to zooplankton, most of the size-dependent relationships could not be the same between micro-zooplankton and mesozooplankton. That is why we needed to create another functional group, the copepod-like metazoan with allometric relationships representative of arctic metazoans.