:: Volume 14, Issue 2 (2015) ::
IJFS 2015, 14 Back to browse issues page
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)
M Mahdavi, T Maktabi, S Mahdavi *, M Roostaie, M.F Alasvandi
, smahdavi125@yahoo.com
Abstract:   (4623 Views)
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<0.05) in different seasons after normalizing the data through the T-test. On the basis of T test on normalized dates differences were meaningful between population of Cyanobacteria in the optical and no optical layers. Statistical analyses have shown significant and positive correlations between abundance and biomass with parameters like temperature, ammonium and phosphate while it was significantly negative for nitrates.
Keywords: Cyanobacteria, Abundance, Nutrients, Seasons, The Caspian Sea
Full-Text [PDF 665 kb]   (1315 Downloads)    
Type of Study: Orginal research papers | Subject: Ecology
Received: 2013/12/27 | Accepted: 2014/09/21 | Published: 2015/08/10


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Volume 14, Issue 2 (2015) Back to browse issues page