Phytoplankton and bacterioplankton represent the base of the aquatic food webs. The changes in the structure of their communities at different levels, from taxonomic and functional composition to single cells traits, and the degree of coupling among them has strong impact on transfer of energy to higher trophic levels and finally on the fate of organic matter. Changes in the structural pattern of the microbial community at different levels have been studied in temperate estuaries,...