F.S Tahami - Caspian Sea Ecology Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization, Sari, Iran

This study done in the spring, summer, Autumn and Winter, at ۴۰ study sites from ۸ transect between Astara to border of Hasangholipour. Transect are in Astara, Bandar Anzali, Sefidrood, Tonekabon, Noshahr, Babolsar, Amirabad, Bandar Turkman and the South Coast of the Caspian Sea. In each transect, ۵ stations at depths of ۵ m, ۱۰ m, ۲۰ m, ۵۰ m and ۱۰۰ m were determined to sample a chapter of depth zero (level) and ۱۰ m, ۲۰ m, ۵۰ m and ۱۰۰ m by Rutner was performed. A total of ۲۴ species were identified from the phylum Dinoflagella. The maximum density Dinoflagella (۲۸.۱۷±۲۷.۱۴ per cubic meter×۱۰۶) and maximum biomass ۳۳۴۹±۳۳۶ mg per cubic meter, respectively. Most species diversity Dinoflagella phylum in winter (۱۷ species) has been that species Exuviaella cordata ،Goniaulax polyedra ، Peridinium achromaticum ،Peridinium latum ،Prorocentrum praximum و Prorocentrum scutllum were observed in all seasons. Phylum Dinoflagella with an average density of ۲۸.۱۷±۲۷.۱۴ (the number of cubic meters×۱۰۶) and the average biomass annually ۳۴۹±۳۳۶ (milligrams per cubic meter) of approximately ۹% density and ۴% biomass phytoplankton of area in the country.The diversity, the density and biomass Dinoflagella have been significant changes (p<۰.۰۵).Ongoing changes in microscopic plants including Dinoflagella can effect on fish migration patterns, their growth rate, mortality rate and of course the critical gas concentrations in the atmosphere.

Dinoflagella, Diversity, Abundance, Biomass, Major estuaries