Study on Macrobiotic Community Structure as Pollution Indicators in Jarahi River (From Saied Ashore tomb to enter Shadegan city)
Subject Areas : environmental managementShaghayagh Mombaini 1 , S .Mohammad Bagher Nabavi 2
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Keywords: Jarahi river, Bioindicatores, Physico-Chemistric factores, Macro benthos,
Abstract :
Due to their environmental situations diversity and density, aquatic invertebrates are different. Some species of this group are considered as biological indicators for aquatic ecosystem. Through research in 1386(summer and winter) the diversity of invertebrates of Jarahi river was determined to find bio-indicators and water quality. In this research the physic-chemical experiments and the biological indicators and also its result are used to reduce the errors to minimum. Some indicators of determining the quality of the water which effect on physiology of benthos creatures and on quality of water such as (salinity-temperature-pH-DO-TOM-GSA)are examined. According to achieved results ,11genus and 8 species of 5 classes of freshwater benthic invertebrates are recognized . The maximum percentage frequencies of invertebrates accordingly are : Bivalvia =41/23 % , Gastropoda = 30/88 % , Insecta = 17/71 % , Hirudinea = 9/98 % , Crustacea = 0/2 % ,and so macrobentic community structure in this river is included Bivalvia, Gastropoda, Insecta, Crustacea and Hirudinea . In Bivalvia classes , the maximum frequencies is related to Sphaerium rivicola (Lamark ,1818) species that is the abundance species in all research stations , and it is used as a bio-indicator to determine the water quality .Maximum density of macro benthos were observed in winter (535 m2) and the lowest (498m2) were observed in summer. For evaluation of macro benthos diversity in the study area, the Simpson and Shannon and Margalef indices were also used . The highest and lowest levels of Shannon indices were observed in summer and winter respectively. All the samples showed a medium pollution in all station and sampling season , according to (Welch , 1992) .