Physicochemical Changes and Abundance of Freshwater Snails in Anambra River (Nigeria) During the Rainy Season

Abstract Rapid diversification is a way of responding to environmental change for freshwater organisms. This work examined the physicochemical changes and abundance snails in Anambra River (Nigeria) during rainy season. Field studies were conducted fortnightly from June August 2019 at three stations river namely: Otuocha (station I), Otunsugbe II), Ukwubili III) about 8.35 kilometers apart each other. A scoop net 2 cm mesh size handpicking was used sample randomly water samples taken laboratory analysis. total 896 belonging 6 species ( Afropomus balanoidea , Pomacea maculata Lymnea stagnalis Lanistes ovum Pila wernei Saulea vitrea ) collected. most dominant with relative 45.87 %, while least 2.34 %. There significant negative correlation between dissolved oxygen maculate r = –0.877, p 0.002) positive Stagnalis lymnea 0.840, 0.005). The diversity highest (1.171) followed by (1.133) (0.856) average mean temperatures (23.1 ±0.1) °C, (27.30 ±0.00) (26.80 ±0.03) °C respectively. distribution influenced variability Therefore, further longer time different seasons examine impact on snail are encouraged.