Ecology and abundance of Bellamya bengalensis (Lamarck, 1822) (Gastropoda:Viviparidae) in pond habitats of Rajshahi

Abstract

Studies on the ecology and abundance of Bellamya bengalensis (Lamarck, 1822) was carried out in Rajshahi University Campus in pond habitat. The physico-chemical parameters viz. water temperature (27.6 ± 4.23 °C in 1995 and 27.4 ± 4.43 °C in 1996), water transparency (0.41± 0.03 cm in 1995 and 0.42 ± 0.04 cm in1996), sunshine (6.22 ± 1.98 hours in 1995 and 7.41 ± 1.56 hours in 1996), pH (7.78 ± 0.38 in 1995 and 7.84 ± 0.27 in 1996), DO (4.92 ± 0.75 mg/l in 1995 and 5.73 ± 1.5 mg/l in 1996) and CO2 (5.45 ± 2.06 mg/l in 1995 and 4.04 ± 1.34 mg/l in 1996) of different ponds were recorded.The physico-chemical parameters viz. water temperature (25.82 ± 4.87 °C in 1995 and 25.96 ± 5.4 °C in 1996), water transparency (0.37 ± 0.02 cm in 1995 and 0.4 ± 0.03 cm in 1996), pH (7.78 ± 0.08 in 1995 and 7.8 ± 0.12 in 1996), DO (3.1 ± 0.06 mg/l in 1995 and 2.86 ± 0.31mg/l in 1996) and CO2 (14.6 ± 0.76 mg/l in 1995 and 13.54 ± 1.53 mg/l in 1996) of ditches were recorded. The physico-chemical parameters viz. water temperature (30.18 ± 1.21 °C in 1995 and 30.07 ± 1.21 °C in 1996), pH (7.93 ± 0.3 in 1995 and 7.98 ± 0.3 in 1996), DO (4.93 ± 0.12 mg/l in 1995 and 4.97 ± 0.13 mg/l in 1996) and CO2 (5.63 ± 1.74 mg/l in 1995 and 5.57 ± 1.78 mg/l in 1996) of irrigated paddy field were determined. The rainfall was recorded as 123.36 ± 127.27 cm and 105.75 ± 111.11 cm during 1995 and 1996, respectively. Thirty five spp. of hydrophytes were identified. The minimum and maximum abundances per m² were determined as 124.58 ± 58.93 and 133.33 ± 60.84 during the observation periods of 1995 and 1996, respectively.

Bangladesh J. Sci. Ind. Res. 52(2), 107-114, 2017