engleski

Influence of agricultural and communal wastewaters on the growth of <i>L. minor</i>

In the Baranja county agricultural practice and urbanization significantly affect surface water quality. The drainage canal Karašica is the main recipient of the agricultural and communal waste waters, and the input of various pollutants into this watercourse depends on the seasonal changes in the climate parameters. Water was sampled monthly during one year at two distinctive sites on the drainage canal (S1 – influenced by agricultural runoff and S2 – by communal wastewaters) for laboratory analyses of nutrients, organic substances, heavy metals, pesticides, bacterial contamination, phytoplankton chlorophyll, and Lemna test, which was used to estimate the effect of determined contamination on the growth of <i>Lemna minor</i> L. At the site S2, lower average values of dissolved oxygen and phytoplankton chlorophyll concentration in the water was determined. At the same time, higher nutrient concentrations and organic matter as well as total coliforms, fecal coliforms and <i>Escherichia coli</i> were determined. On the other hand, organochlorine pesticides and their degradation products were higher at the site S1. Physicochemical characteristics of water samples from this site proved to be stressful for the growth of L. minor and correlated well with biomarkers like carotenoid and chlorophylls content and lipid peroxidation.

water quality ; drainage canal Karašica ; Lemna test ; growth inhibition

nije evidentirano