استفاده از شاخص‌هاي زيستي BMWP و ASPT به‌منظور ارزيابي كيفيت آب تالاب هشيلان (كرمانشاه، ايران)

The use of BMWP and ASPT indices to assessment the water quality of Hashilan wetland (Kermanshah, Iran)

نظارت بر كيفيت و حفاظت از تالاب‌ها از اهميت ويژه‌اي برخوردار است لذا در اين پژوهش، با هدف ارزيابي كيفي تالاب هشيلان واقع در استان كرمانشاه به بررسي تركيب جوامع درشت بي‌مهرگان كف زي با استفاده از شاخص‌هاي زيستي BMWP و ASPT و اندازه‌گيري دماي آب، اكسيژن محلول، هدايت الكتريكي و pH پرداخته شد. نمونه‌برداري از 4 ايستگاه منتخب با 3 تكرار تصادفي طي دو فصل سرد (زمستان 1393) و گرم (اواخر بهار 1394) انجام گرفت. بررسي‌ها نشان داد بيشترين درصد فراواني (68 درصد) در هر دو فصل متعلق به رده شكم پايان و خانواده Valvatidae بوده است. بر اساس نتايج، ميانگين شاخص BMWP در ايستگاه‌ها و فصول مختلف نمونه‌برداري داراي تفاوت معني‌دار بود (P<0/05) در حالي‌ كه بين ميانگين مقادير شاخص ASPT به‌جز در فصل گرم اختلاف معني‌داري مشاهده نشد (0/05

Quality Monitoring and protection of wetlands are really important. Therefore, in this research, with the aim of qualitative evaluation of Hashilan wetland located on Kermanshah province, the composition of benthic macroinvertebrates communities using the BMWP and ASPT indices and measurement of Water Temperature, Dissolved Oxygen, Conductivity and pH were investigated. Sampling from 4 selected stations with 3 replications was performed during two cold (Winter, 2014) and warm (late Spring, 2014) seasons. The results showed that the highest abundance (68%) in both seasons belonged to the class of the Gastropoda and Valvatidae. Based on the results, the mean of the BMWP index was remarkabley different at diverse stations and seasons (P<0/05), while there was no significant difference between the mean values ​​of ASPT index except in the warm season (P> 0/05). According to the BMWP index in the warm season, the study stations were classified into two good and acceptable groups, and in winter, they were classified into three groups: acceptable, poor, and moderate. According to the results of the comparison of the ASPT index, water quality at the end of spring was classified into three groups with clean, moderate and doubtful. During the sampling period, the highest quality was observed at station 1 (Sabz Ali mirage input) and lowest quality at station 2 (agricultural effluent) and 4 (near the Hashilan village before the output). Also, the index of BMWP with EC and DO had negative and positive correlation at the level of 0/01 respectively and ASPT index with water temperature was positively correlated at 0/05. The results of the present study showed that the Hashilan wetland somewhat affected by contamination caused by human activities. Therefore, it seems that the implementation of coherent managerial rules and proper training of the people of the region can greatly improve the status of this patterned wetland.