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Acta Agronómica

Print version ISSN 0120-2812


MALLAMA LEYTON, Juan René  and  GUZMAN ALVIS, Angela Inés. Clearance rate of faecal coliforms by netropical freshwater clam. Acta Agron. [online]. 2011, vol.60, n.1, pp.76-83. ISSN 0120-2812.

Under laboratory conditions the efficiency of the freshwater clam Anodontites tortolis to diminish the quantity of faecal coliforms, determined by the membrane filtration method during eight hours was evaluated. The experiment was design with two treatments (two densities of six (T1) and eight clams (T2) and a control) and three replications. Statistical significant differences (P<0.05) according to the Kruskal-Wallis test for the clearance rates were found. The highest levels of remotion of E. coli belonged to the treatment in which there was the highest number of individuals. The clearance rate of the clams varied between 0.47 and 3.80 l.h-1.ind-1 which is reported in the literature. Removal levels showing A. tortolis suggest that this clam can be used as a biological resource for the treatment of the tertiary waters contaminated with faecal coliform bacteria.

Keywords : Anodontites tortolis; biofilter; bivalves; clams; clearance rate; coliforms; Escherichia coli.

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