Ecological study on toxic species (Pseudo-nitzschia seriata) in the southern Caspian Sea
Subject Areas : New Technologies in Aquaculture Development
Keywords: Caspian Sea, Keywords: Seasonal diversity, Pseudo-nitzschia seriata,
Abstract :
Abstract[1] This study done in 2010-2011 through Spring, Summer, Autumn and Winter, in 32 studies from 8 transects (Astara, Anzali, Sefidrood, Tonekabon, Noshahr, Babolsar and Bandar Turkman). In each transect, have choosen 5 stations and different depths of 5 m, 10 m, 20 m, 50 m and 100 m were sampled quarterly from the zero depth (level), 10 m, 20 m, 50 m and 100 m were by Niskin sampler. Due to various Physic and Chemical factors of the river leading to the sea, the topographic basin and also affect the entry of new species planktonic such as Mnemiopsis leidyi from the Black Sea to the Caspian, the diversity and density of aquatic species drastically changed since 1384 a new species of diatoms called Pseudo-nitzschia seriata found in the southern Caspian Sea and in the Caspian Sea, adapted itself to new conditions and the ability to grow and reproduce in the environment has increased. Pseudo-nitzschia seriata is a eukaryotic cell with ability to produce Domic acid that can be harmful to aquatic and human. Due to various Physic and Chemical factors such as temperature change (change of seasons), high concentrations of dissolved nitrogen in all of these examples can effect on the toxin (Domic acid) production, then in different seasons, transects and deeps are different. This fish disease because of some factors such as temperature change (change of seasons), high concentrations of dissolved nitrogen in all of these examples relate, from the surface to depths decreased. In the spring, in all transects, Pseudo-nitzschia seriata was present and maximum density and biomass of this showed in the BABOLSAR transect (105×5323 per cubic meter density and biomass of 31 mg per cubic meter) in the winter. * Corresponding Authors; Email: farnaz_tahami@yahoo.com
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