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A comparative study of monthly and seasonal variations in productivity of molluscs in Hardia wetland of Saran District of North Bihar, India

Chitralekha Sinha*
P.G. Department of Zoology, J.P. University, Chapra, Bihar, India
Received : 27th December, 2019 ; Revised : 20th February, 2020

Abstract : Other faunastic survey of the wetland was also made. It was focused on macro invertebrates: arthropods, molluscs and annelids. Sharma et al., (1983)1 have studied molluscan fauna, Singh et al., (1994)2, Sharma and Munshi (1995)3 have studied other fauna of wetlands also. Altogether 85 species of macro invertebrate were recorded during the present investigation belonging to three major groups-arthropods, molluscs and annelids. The wetland is rich in molluscs fauna. Its abundance is due to profuse macrophytic growth. Rich organic matter in the bottom provides good habitat for
molluscs growth. The macro invertebrates abundance in the wetland is directly controlled by the seasonal appearance and disappearance of the macro vegetation of the area, nature of bottom, rainfall and flooding (Subba Rao, 1989)
4. Molluscs were represented by the members of single class Gastropoda. Gastropoda were represented by 11 species belonging to five families. The molluscan density varied between 29 no./m2 (August) and 160 no./m2 (Feb.). An increasing trend in the molluscan density was observed in winter and late monsoon while decreasing trend was observed in
summer and early monsoon season. The maximum production of molluscs during post monsoon season may be due to high macrophytic growth and availability of dead and decaying organic matter (Reavell, 1980)

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