Journal Article climate change Mesozooplankton NAO Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. annual phytoplankton succession biodiversity change biomass decline bottom up control copepods diatoms dinoflagellate dinoflagellates food webs functional groups hydrodynamics indicators long-term changes northward movement oblates pelagic phenology prolates sea surface temperature subpolar gyre time-series top down control westerly wind