Caspian Sea is the biggest lake in the world among Iran. Torkamanestan, Ghazaghestan, Russia and republic of Azerbaijan. There have been many and different studies on Mazandaran Sea Bentouz that occurs in different deeps of the sea and times and places of Gilan coast in More
Caspian Sea is the biggest lake in the world among Iran. Torkamanestan, Ghazaghestan, Russia and republic of Azerbaijan. There have been many and different studies on Mazandaran Sea Bentouz that occurs in different deeps of the sea and times and places of Gilan coast including three sections: west, central coasts, east coasts. Bentouz are among creatures living near or in the deep of the ocean and seas, and depend on surface of sea. Some of the Bentouz live between sediment and some others live on the sediment close to the bottom of the seas. Present studies have been done during 10 months from Aban 2009 till Mordad 2010 in south west coast of Caspian sea (Gilan province) through choosing 4 stations called: Sefidrood, Anzali port, Lisar and Astara of 0/5 to 1 meter deep (close to the coast and a little far from the coast) and was repeated for 9 times monthly in each stations. During 4 seasons of sampling, tottaly 17936 micro Bentous from 4 Anzali stations numbering 769, Sefidrood numbering 16435, Lisar numbering 490 and Astara numbering 248 was collected in Gilan province and 19 types were recognized. The maximum supply belonged to the Sefidrood station and the minimum supply belonged to Astara station. Also the maximum supply of micro bentous in the coast of Gilan province belonged to gammaridae group in Sefid rood and then the maximum supply belonged to the type of stuari sefidrod in Anzali coast and the minimum micro Bentous in the Gilan province coast belonged to the types of Hypania invalida، Anisus stud، Tinodes waeneri، Polycentropus flavomaculatus ، Rhithropanopeus harrisii ، Lubidura riparia ، Ilybius fuluinosus.
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The present study was conducted for identification and assessment biodiversity of Polychaeta of Mongoft Artificial Reef structures in BushehrProvince.
At first, 3 stations were selected. Seasonal samples were collected in spring and summer 2009, with 3 replication by d More
The present study was conducted for identification and assessment biodiversity of Polychaeta of Mongoft Artificial Reef structures in BushehrProvince.
At first, 3 stations were selected. Seasonal samples were collected in spring and summer 2009, with 3 replication by diving operations, using Quadrates from each station was done. In total 7 species of Polychaeta were identified.
Maximum frequency of Polychaeta, 644.64 n / m2, in the spring and the minimum number of 204 was recorded in summer.
Results showed that Nereis sp. with 277.44 n / m2 (32.69 %) in the seasons and sampling stations was the most abundant.
ANOVA results identified significant differences between the number of Polychaeta of the two seasons (P<0.05).
In review of the biological indices, greatest Shannon diversity index was in station 1 in the spring with the amount of 1.83 and smallest Shannon diversity index in to the station 1 was in the summer with the amount of 0.50 has been. Indices were compared to determine that spring was diversity more diverse than summer. Considering the values obtained, biological indices it can be concluded that the region is exposed to stress, and it can affect the diversity of benthic fauna.
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Fluctuations of density and biomass of polychaetes in four stations at southern Caspian Sea was measured seasonally. Sampling was conducted in February, May, August and November 2006. Benthic samples were collected with a Van Veen Grab sampler from depths of 7 and 20 me More
Fluctuations of density and biomass of polychaetes in four stations at southern Caspian Sea was measured seasonally. Sampling was conducted in February, May, August and November 2006. Benthic samples were collected with a Van Veen Grab sampler from depths of 7 and 20 meters along two transects, from western parts of the coast to Radio Darya area at the east. In the present study, 4 species, 4 genera and 2 families of polychaetes were observed, which were dominated by Parhypania brevispinis. The average maximum density of polychaetes was 3644.2 individuals per square meter (with standard error of 872.1) during Summer in the depth of 7 meters of western transect, while a mean minimum density of 133.3 individuals per square meter (with standard error of 28.9) was observed during Winter in the depth of 7 meters in the same area. Maximum average biomass of polychaetes was 1900 mg per square meter (with standard error of 740) during Spring in the depth of 20 meter of Line 8 area, while the minimum biomass was 30 mg per square meter (standard error was 20) during Winter in the depth of 7 meter in the same area. Generally speaking, the western part of Chalus Coast had more density and biomass as compared with the eastern part.
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