ECOLOGICAL STUDIES ON FRESHWATER BIVALVE MUSSELS (PELECYPODA) OF INDUS RIVER AND ITS CANALS AT KOTRI BARRAGE SINDH, PAKISTAN

G. H. Burdi, W. A. Baloch, F. Begum, A. N. Soomro, M. Y. Khuhawar

Abstract


Freshwater pelecypod occurrence was studied from October 2005 to September 2006 in Indus River and its canals at Kotri Barrage, near Jamshoro, Sindh. Sampling area included five stations namely, Pinyari Canal, Phuleli Canal, K.B. Feeder, Chakumber (Ring Dam) and River Indus (downstream). A total of four (04) genera  including  seven  (07)  species of pelec ypods were identified where Parreysia (Radiatula) wynegungansis was found most dominant. Pelecypod populations  were fairly good and more or less same numbers of individuals were recorded at K.B. Feeder, Pinyari Canal, Phuleli Canal and Chakumber. The Indus River (downstream) was very poor in live Pelecypods, where only empty shells were found. The lowest temperature was in January (16.7°C) while highest being in August (32.5°C). Lowest D.O was 5.0 mg/l at Chakumber in August and highest was 6.2 mg/l in January. TDS and conductivity were higher at Chakumber in January. Water transparency was very low (2.0 cm) throughout all stations during flood season (July–September) and higher (58.0 cm) during dry season (January-March). The Chakumber was more transparent than other stations because of its shallow and stagnant water. The pH ranged in between 7.4 to 8.2 whereas hardness ranged between 70-mg/l to130 mg/l. The Pelecypod populations showed a direct relationship with the temperature and strong correlation was evident. On the other hand pH, hardness and secchi transparency showed a negative correlation with the population density.


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