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Evaluation of bivalve clearance rate (CR) as a physiological indicator of heavy metal toxicity in freshwater mussel, Anodonta cygnea (Linea, 1876)

Fateh Moezzi, Arash Javanshir, Soheil Eagderi, Hadi Poorbagher, Mohammad Sallaki

Abstract


This study was performed to evaluate suitability of clearance rate (CR) as a physiological indicator of zinc (essential element) and chromium (non-essential element) toxicity in Anodonta cygnea (Linea, 1876). CR of bivalves was measured before and after 9 and 18 days exposure to 100 µg l-1 Zn and Cr during 120 min with 15 min intervals. 5, 25 and 125 µg l-1 concentrations of each metal were used for CR measurement. Irregular fluctuations were observed in pre-exposed CR of bivalves in all three concentrations of both metals during 2 hour period. There was significant difference (α=0/05; P < 0/025) between CR of Zn and Cr in lowest (5 µg l-1) and highest  (125 µg l-1) exposure concentrations. Maximum CR for both metals was obtained in lower concentration. Also, calculated post-exposed CR for both metals in days 9 and 18 after exposure were significantly (α=0/05; P < 0/01) lower than control bivalves. Based on the results, clearance rate is a useful measure of heavy metal toxicity in A. cygnea as a model of freshwater bivalves.


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