This variation in time of the grazing pressure and the two bloom dynamic observed for some species highlights the potential of taking the diapause trait into biogeochemical models. Indeed, with the increase of intrusion of Atlantic water into the Arctic, there have been an increase of the occurrence of a second phytoplankton bloom in fall in some of the Arctic areas \cite{Ardyna_2011,Ardyna_2014,Yool_2015}. Even thought this system is still bottom-up driven, by taking into account a varying grazing pressure from the metazoans species might help to identify future areas that could exhibit a change of phenology.