Development of an aplanospore induction bioassay for monitoring marine pollution
2006
Ismail, M. | Phang, S.M. | Brown, M.T.
Two Malaysian species of marine coenocytic chlorophytes, Boergesenia forbesii and Ventricaria ventricosa, were employed in a study to develop a biomonitoring method using aplanospore formation due to induction by wounding was characterized in two local species. Effects of plant and wound sizes on aplanospore induction and formation were also observed. Observations were then carried out on aplanospore induction in B.forbesii and V.ventricosa due to selected anthropogenic toxicants, which included two heavy metals, cadmium (Cd) and copper (Cu), and three nutrients, ammonium, nitrate and phosphate. Aplanospore induction due to environmental stresses such as light, temperature, pH and salinity were also recorded. The aplanospore induction bioassay is a sensitive and practical method for monitoring heavy metal pollution in the marine environment. The Cd 24h EC50 values obtained for B. forbesii and V. ventricosa were out mg/L and 0.27 mg/L, respectively while the Cuy 24th EC 50 value for B. foresii was 0.79 mg/L. Both species are sensitive to ammonium and phosphate, but tolerant to nitrate. The bioassay should be conducted under the following environmental conditions: irradiance 8.5-17.0 mol photon/sq m/s, temperature 25-28 deg C, salinity 27-34 g/L and pH 7.5-8.5.
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