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… some effects, such as those from chemical pollutants, waste or excess nutrients, are more insidious, and their … cholera or leptospirosis; storms can increase transport of waste water diseases to groundwater. • Variations in … 97 3.3.3 Sample collection and preservation …

… metres at low tide, as well as human-made wetlands such as waste-water treatment ponds and reservoirs. About this series … virus can survive in water and spread through wetlands. Waste from poultry facilities should not be allowed to enter … used for natural resource exploitation (fishing, hunting, collection of other wetland products, grazing, etc.). 69. In …