Study for quality monitoring Shadegan wetland

Abstract

Introduction: The purpose of this study is to investigate the biological indicators in the quality
monitoring of Shadgan Wetland.
Materials & Methods: This research was done in 6 stations in Shadegan wetland. Sampling
was conducted in spring and summer, from each station, 3 sediment samples for the isolation
and identification of benthic macro invertebrates and one sample for grain size analysis and
organic matter in sediments measure was taken. Total organic matter and grain size were
measured by ignition loss method and sieve method respectively. Physicochemical parameters
of water such as temperature, dissolved oxygen, salinity, pH, EC were taken in three times at
each stage. Shannon, Simpson, Camargo, Brillouin, N1 indixes were used to assess the
biodiversity of macrobenthose in study area and in order to understand the ecological situation
in the region in terms of pollution, used of HFBI, BMWP indexes.
Result: During the two seasons sampling, totally 16 species of 5 class macrobenthos were
counted and identified. Among the identified group the Gastropoda and then Bivalvia were most
common between two seasons. Shannon, N1 have significant difference between two seasons
(P<0.05). Maximum amount of Shanon, Brillioun and N1 were in spring that show high
diversity of macro invertebrates in spring season. Based on results of the BMWP index, water
quality at stations in spring and summer were in poor quality class. Results of statistical analysis
of HFBI showed that in spring, the station 4 is significantly different from the other stations
(P<0.05). HFBI indicator in the study area in spring and summer be classified as in two classes
of poor quality and relatively weak.
Conclusion: The results of this study, the role of sewage discharge into the wetlands and the
increasing trend of increasing organic pollution wetlands shows the necessity of taking into
account environmental considerations and management of organic contaminants to reduce
demand.