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… some effects, such as those from chemical pollutants, waste or excess nutrients, are more insidious, and their … ducks Somateria mollissima � Lead poisoning Technology and industrial changes � Food production changes � Breakdown in … agricultural intensification and expansion, increasing industrial and human population pressures including the …

… metres at low tide, as well as human-made wetlands such as waste-water treatment ponds and reservoirs. About this series … rats and mice have the potential to carry disease between industrial or domestic poultry and wild birds, and thus they … virus can survive in water and spread through wetlands. Waste from poultry facilities should not be allowed to enter …