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Mercury is one of the most dangerous global environmental pollutans toxic elements and the most toxic heavy metal.It is highly neurotoxic and it could be responsible for many diseases,such as Alzheimers,Parkinsons,Autism or Lupus.Presence of phytoplankton and zooplankton in marine environment affects the transfer of mercury into the foodchain.The main goal of this study was to determine concentration of mercury in phyto-and zooplankton from the coastal zone of the Southern Baltic Sea.Research aimed also an identification of the variability of Hg levels in first levels of trophic chain through the year.Three sampling stations(Oslonino,Chalupy and Gdynia)were situated in the coastal zone of the Gulf of Gdansk.Samples of plankton were collected monthly form December 2011 to May 2013 with planktonic nets(20 um and 50 um mesh size for phyto-and zooplankton,respectively).For separation of alive and dead zooplankton and suspended particles,phototaxia was used.Analysis of total mercury were performed by AAS method using the AMA-254 analyzer.Plankton species occurring in the Gulf of Gdansk absorb and reduce mercury at different rates.Shifts in species composition,which could be induces during the year,can significantly affect Hg cycle.Input of atmospheric mercury affects the increase of mercury level in phytoplankton during the heating season.Hg concentration in the zooplankton are controlled not only by species composition of zooplankton itself,but also by species composition of phytoplankton.Species composition favoring the transfer of mercury into the higher trophic levels seem to be simultaneous of Mesodinium rubrum and Synchaeta: Alexandrium ostenfeldi and nauplii Balanus improvisus as well as Coscinodiscus granii and Acartia.