Assessment of impact of agricultural chemicals in the Hurricane Hugo disaster rehabilitation program on aquatic systems in Dominica

provided fertilizers for the rehabilitation of banana plantings and other crops. These fertilizers were already available and being used in Dominica. However, because it is widely believed that chemical pollution of surface waters is poisoning coral reefs in the region, this study was funded to assess the environmental impact of the fertilizers as well as of selected pesticides. The study found little evidence of fertilizer-related water quality problems. Although fertilizer application may be intense during certain periods, high rainfall and steep stream gradients provide rapid dilution of nutrient inputs. However, increased fertilizer use and expansion of cultivated acreage could lead to problems in the future. Specific recommendations are provided for developing a water quality monitoring program. The study also analyzed samples of potable water, surface water, river sediments, fish, and terrestrial wildlife for pesticide residues. Results indicate that pesticides are not concentrating in the environment, although pyrethroid insecticides, even if below the minimum detection level, could effect small aquatic organisms. Disposal of pesticide containers is also a potential problem. More detailed monitoring should be carried out over a long period of time.