การใช้หอยน้ำจืดเป็นดัชนีชีวภาพของคุณภาพน้ำในแหล่งน้ำธรรมชาติภายใน มหาวิทยาลัยเทคโนโลยีราชมงคลสุวรรณภูมิ ศูนย์หันตรา

Abstract

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Freshwater mollusk as the bio-indicator of the natural freshwater reservoirs in Rajamangala University of Technology Suvarnabhumi, Huntra campus

This research aimed to study the distribution and diversity of freshwater mollusks in natural freshwater reservoirs of Rajamangala University of Technology Suvarnabhumi. Freshwater mollusks were used as the biological index for water quality of natural water reservoirs at Rajamangala University of Technology Suvarnabhumi. Water samples and mollusks from 11 freshwater reservoirs were collected during 8:00-10:00 a.m., once a week for 11 weeks. Eight species of mollusks including Bithynia siamensis, Ensidens ingallsianus, Filopaludina sumatrensis polygramma, Filopaludina sumatrensis peninsularis, Indoplanorbis exustus, Melanoides tuberculata, Pila gracilis and Pila pesmei were found. The distribution pattern of almost all the freshwater mollusks was pclumpq pattern near the coast except Ensidens ingallsianus that was found in the central of the water reservoirs. In the aspect of physical and chemical properties of water, the acidity - alkalinity (pH) ranged from 7.60 to 11.45, and the water temperature was between 19-37 degrees Celsius. In addition, dissolved oxygen ranged from 0.82 to 7.90 milligrams per liter. The amount of each mollusk varied according to the quality of water reservoirs. The species mostly found in the highly polluted reservoir was Melanoides tuberculata. The species found the least in the polluted reservoir was Pila pesmei. The result showed that these two species can be used together as the biological index to indicate the water quality of freshwater reservoirs in Rajamangala University of the Technology Suvarnabhumi, Huntra campus.