Abundance of freshwater gastropods and correlation with water quality in Nam Oun reservoir, Sakon Nakhon Province.

Abstract

This study aims to correlation between abundance of freshwater gastropods and water quality  in Nam Oun reservoir, Sakon Nakhon Province. The three samplings were carried out from November 2013 to October 2014 according to seasons. The total numbers of gastropods was 583 individuals, 4 Orders and 8 species of  gastropods including Pomacea canaliculata, Filopaludina sumatrensis, Bithynia siamensis, Idiopoma sp., Pyrgulopsis sp., Lymnaea sp., Thiara sp., Indoplanorbis exustus. The distribution pattern of almost all reservoirs. The species mostly found was Idiopoma sp. Percentage of abundance highest of reservoirs. Co-inertia analysis was used to determine which water quality would influence the abundance of those. Idiopoma sp. was showing the positive correlation with hardness, Thiara sp. and Bithynia siamensis were showing the positive correlation with conductivity and alkalinity and Indoplanorbis exustus was showing the negative correlation with dissolve oxygen