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90 Sr activity was determined in  Zostera marina  collected in the Gulf of Gdańsk in 2008-2013.  90 Sr activity in  Z. marina  from Jama Kuźnicka and Klif Orłowski range from 0.83 Bq kg −1  d.w. to 3.78 Bq kg −1  d.w. and from 0.68 Bq kg −1  d.w. to 4.95 Bq kg −1  d.w., respectively. The plants collected in spring-summer showed significant differences between  90 Sr content in blades - 1.55 Bq kg −1  d.w. in 2011 and 2.18 Bq kg −1  d.w. in 2013, and in roots - 7.75 Bq kg −1  d.w. and 11.44 Bq kg −1  d.w., respectively. The reduction in  90 Sr concentrations in  Z. marina  roots to 1-2 Bq kg −1  d.w. in summer resulted from the transport of this element to the young parts of the plant. In autumn and winter, the  90 Sr content in the blades of  Z. marina  was increasing and reached the maximum of 3.77 Bq kg −1  d.w. This could be explained by the process opposite to dilution, related to the biomass reduction and strontium concentration in the plant tissues. Changes in  90 Sr concentration in  Z. marina  tissues are affected by isotope concentration in seawater as well as by salinity, which affects the concentration of Ca 2+  - for which Sr 2+  is a chemical analogue.

90Sr in Zostera marina from the Gulf of Gdańsk (southern Baltic Sea)