Ecological assessment the impacts of shrimp farms effluents on the structure of benthic macroinvertebrates communities using BENTIX biotic index (Case study: Tiyab creek - Hormozgan Province)
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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
This study aimed to investigate the effect of Tiyab shrimp farms effluent (Hormozgan Province) on the physicochemical parameters of water, sediment and on the structure of macrobenthic assemblages in areas receiving effluents was conducted during one-year period (from April 2014-April 2015). According to the area of the region and water depth, 3 plots selected (sea water inflow to the creek, before the sea water inlet channel into shrimp farms and after output channel of shrimp farms) and samples were taken. During the study, 24 families of benthic macroinvertebrates were identified in the Tiyab creek, which contains 6 orders belonging to 3 phyla. In total, the highest number of families and species of benthic macroinvertebrates were belonging to Annelida, Arthropoda and Mollusca, respectively. The results of the ecological classification of studied plots based on BENTIX index in different seasons indicated that the plots located before the shrimp farms classified in classes "no pollution" to "moderately polluted" and plots that located after and on-site effluent output from shrimp farms were classified in the categories of "slightly polluted" to "heavily polluted". The most important factors influencing the distribution of benthic macroinvertebrates in this study were: salinity, nitrate, biochemical oxygen demand (BOD), total soil phosphorus (TP) and total organic matter (TOM), respectively. Also in this study Capitella capitata and Clymene robusta species as a species resistant to pollution and species Assiminea sp. And Littorina intermedia were introduced as species sensitive to disturbance and pollution.
Language:
Persian
Published:
Journal of Animal Environment, Volume:10 Issue: 1, 2018
Pages:
303 to 312
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