Özet:

Malathion is one of the insecticides commonly used to control hazelnut pests in hazelnut orchards in Giresun region. This insecticide pollutes lakes, rivers and sea waters by drifting from the soil with rain, flood and snow waters. In this study, Scenedesmus sp. cultures were prepared in BG-11 medium for use in laboratory experiments. It was aimed to determine the change in algal growth due to the increase in malathion concentration applied to these cultures. Growth of strains in cultures treated with malathion at doses of 0.05 mg/L, 0.5 mg/L, 1 mg/L, 5 mg/L and 10 mg/L were compared with those grown in non-malathion cultures. In addition, pH was measured and chlorophyll-a values were also calculated for the control group and the cultures to which malathion was added during the study. Cell number showed different changes over time according to pesticide concentrations. The highest number of cells was 3.61x106 cells/ml at 10 mg/L dose at the end of 24th hour and the lowest number of cells was 2.05x106 cells/ml at 10 mg/L dose at the end of 48th hour. pH values did not fluctuate much and generally decreased at the end of 96th hour. The lowest chlorophyll-a was calculated as 0.35 µg/L at 96th hour. As a result, it was determined that the doses studied negatively affected algal growth, although not too much.

Anahtar Kelimeler: