شناسه هاي افزوده :
نصراله زاده ساروي، حسن ، همكارطرح , پورنگ، نيما ، همكارطرح , رامين، محمود ، همكارطرح , نگارستان ، حسين ، همكارطرح , سليماني رودي، عبدالله ، همكارطرح , نجف پور، شعبان ، همكارطرح
چكيده انگليسي :
Abstract
This study has been conducted in the coast of Caspian Sea in Mazandaran region of Kelarabad where the cages were e. Seasonal sampling at three stations, including 1 station (seating cage), Station 2 (at a distance of 500 m west of seating cage) and Station 3 (at a distance of 50 meters east of the location of the cage) was performed. For ampling was used with a boat to 48hp. The aim were identification of biological groups (phytoplankton, zooplankton, macrobenthos, comb jelly), physicochemical parameters, environment pollutants in different stations, layers, season and month at the water and sediment. In total, 37 species of phytoplankton were identified, namely Bacillariophyta (22 species), Pyrrophyta (8 species), Cyanophyta (4 species), Chlorophyta (1 species) and Euglenophyta (2 species), respectively. Chlorophyta and Bacillariophyta phylum, respectively lowest and highest species richness by 3% and 56%, respectively, so that the species Nitzchia acicularis, Skeletonema costattm and Thalassiunema nitzchoide has had the most appearances in different seasons. Significant differences in terms of density and biomass among the branches there (p<0.05), no significant difference was observed in terms of density and biomass of the different stations (p>0.05). Bacillariophyta dominant phytoplankton in different seasons showed that formed the phytoplankton population density and biomass was maximum in winter which it would be because of the cold like this phyla of species and the availability of nutrients depend. The status of zooplankton showed that a total of six species were identified. Zooplankton identified as belonging to the group Haloplankton (real zooplankton), including 3 family Acartidae and Asplanchnidae each with 1 species, Podonidae with two species and Meroplankton (zooplankton temporary) iclouding Balanidae with two species. The abundance and biomass of zooplankton in different groups showed that the most frequent, with 62% Acartia tonsa of the Subclass Copepoda and Cladocera species Podon polyphemoides and Evadne anonyx of the order with the lowest density 8%, respectively. There is a significant differences in terms of density and biomass at various stations (p<0.05).
In this study, evaluation of organic and inorganic nitrogen, showed that in winter was the highest amount that can be a positive correlation between phytoplankton and nutrients. No significant differences were found in terms of density and biomass at different stations but there were differences among different seasons which it can be due to temperature change, rotation spring and autumn weather, sea currents, nutrients etc. As well as the density and biomass of phytoplankton in different water layers showed that the highest density and biomass in the 10-meter layer that can be linked due to the entry of nutrients and reduce turbidity. Study on total dissolved solids, showed that the turbidity increases from surface to depth, which can affect the density and biomass of phytoplankton and prosperity. In the present study, the concentration of phytoplankton biomass in the spring and fall shows, but the density and biomass of zooplankton was the highest amount in which it would be due to the presence of predators, especially zooplankton and phytoplankton five of them relate this season. Explore different forms of phosphorus in water showed different layers the amount of inorganic phosphorus and organic phosphorus in both summer and winter, in spring and autumn, the highest amount in the surface layer as can be positive correlation between algae bloom with the amount of nutrients in the fish cage culture of marine water related. In the present study, the relationship between changes in the amount of organic matter in the context of macro creatures in different seasons of the show that some species are positively correlated with high organic matter bed. The species of this group were Streblospio gynobranchiata and Hedixte diversicolor where can the ecological niche of the living conditions and environmental behavior and expressed its nutritional because the two species have a vegetarian diet are suspended. The results showed that the concentrations of heavy metals in water and sediments is lower than the limit but the concentration of some of them has been compared to global standards that it would be to geographical conditions and topography, river water, ship traffic and other factors related to natural and geochemical.
كليدواژه :
گروههاي پلانكتوني , بي مهرگان كفزي , آلاينده ها , فيزيكوشيميايي آب , قفس هاي دريايي , كلارآباد , درياي خزر
