TY - JOUR T1 - Changing trends in the abundance and biomass of cyanobacteria in the southern part of the Caspian Sea in 2009 (The stretch between Tonekabon and Amirabad) TT - JF - IFRO JO - IFRO VL - 14 IS - 2 UR - http://jifro.ir/article-1-1263-en.html Y1 - 2015 SP - 503 EP - 512 KW - Cyanobacteria KW - Abundance KW - Nutrients KW - Seasons KW - The Caspian Sea N2 - Changes in abundance and biomass of cyanobacteria have been studied in the southern part of the Caspian Sea (the stretch between Tonekabon and Amirabad) in four seasons (spring, summer, autumn, winter) in which samples were taken from five depths of 5, 10, 20, 50 and 100 meters in the stations of Tonekabon, Noushahr, Babolsar and Amirabad. Samples were fixed in formalin (2-2.5%) before transferring to the lab for both qualitative and quantitative analyses. Ten species of cyanobacteria were identified with higher abundance and biomass in the euphotic layer compared to the aphotic layer. Temperature and nutrients have shown significant differences (p M3 ER -