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Articles by M. Shapoori
Total Records ( 3 ) for M. Shapoori
  A. Javanshir , M. Shapoori and S. Jamili
  Macro benthic invertebrate assemblages were investigated monthly, from March 2006 to March 2007, at six stations in Tajan river estuary, a south eastern Caspian Sea coastal estuary, in order to estimate secondary production consumable for extensive finger fish releasing and to investigate the factors affecting this production. Benthic assemblages comprised 9 taxa, of which Ballanus sp., Chironomus plumosus and Cerastoderma lamarki were the main contributors to both overall biomass and secondary production. Annual secondary production varied from 4.55 g AFDW m-2 year-1 (Ash Free Dry Weight), in the upper Tajan estuary, to 78.06 g AFDW m-2 year-1 (Ash Free Dry Weight) in the center of the estuary area. Multivariate correlations between environmental variables and the Macro benthic assemblage biomass highlighted the role of the water level, temperature, sediment organic carbon content and dissolved oxygen in the differentiation of the communities in the estuary. Composition, biomass and secondary annual production of Macro benthic communities were dramatically affected by changes in water residence time and summer drought crises. The isolation of this habitat limits the recovery of other invertebrate benthic assemblages during drought periods. Only populations of two species, Balanus sp. and C. plumosus, seemed to be able to recover quickly after the drought crises, which, in turn, could compromise the overall secondary production, with negative effects on the released fish survival. During summer water renewal, when agricultural activity is intense and nutrient inputs should be regulated in this estuary to reduce the risk of benthic mass mortality and to ensure a sustainability of this environment.
  M. Shapoori , A. Javanshir , S. Jamili , M. Fallahi and R. Changizi
  The phytoplankton community composition, abundance and size-fractionated biomass (chlorophyll a) along with various physical and chemical parameters were assessed in Tajan estuary, in South Caspian Sea Basin. Monthly sampling was conducted at 6 stations. Based on results, the mouth or formed estuary could be categorized in three different classes. Category 1: station essentially related to river input and low net production (vary between 13.8 and 46.4 mg m-3 year-1. Category 2: consists of high net production (between 277.9 and 330.4 mg m-3 year-1) and mild consumption of (8.4 to 32.5 mg m-3 year-1). The 3rd category is considered to be in the middle of two above values from productivity point of view with (236.7 to 240.2 mg m-3 year-1) and relatively mild consumptions of (20.9 to 92.4 mg m-3 year-1). It seems that importance of such areas is much more in their nutrient inlet of the river from upper mouth. Net primary productions were high in the center of estuary with values near to 277 mg m-3 year-1. Selected station in lower mouth situated in the adjacent area inlet also showed high concentrations of 330 mg m-3 year-1, which suggests the existence of a nutrient front where fresh waters originated from rivers (rich in nutrient and phytoplankton decomposition materials) joint salt waters of the sea. In these stations phytoplankton has not enough time to be consumed because of soft sediments instability and inevitably is added to south Caspian basin production. Also primary production among months and seasons shows fluctuations, perhaps related to water inlet availability and residence time. There suggests a correlation between primary production and river discharge in different selected stations.
  N. Zorriasatein , B. Dehzad , G. Vossoughi , M. Shapoori and S. Jamili
  The present research is a study on water quality and benthic macro invertebrate in Gorganrood River, a South Eastern Caspian Sea. The research was carried out at six sampling sites and the abundance and diversity of benthos were monitored along the length of river from 2007 to 2008. Fourteen families included under different groups such as Annelida, Mollusca and Insecta were recorded in the present investigation. The greatest number of species were recorded at 1st station and the least number was at 6th station. Low macro invertebrate abundance was observed during spring as a result of heavy rainfall and flood and generally in all lowest section because of high value of nitrogen and other nutrients. Water physicochemical parameters such as Phosphate, Nitrate, TPS and others were measured and water quality were studied through different indices such as saprobic system, Helsinhoff (FBI), BMWP and the results were compared and evaluated by physical and chemical parameters. The result indicated that the water quality in the up stream and the middle were good to fair, but the down stream qualities were poor at all sites.
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