ABSTRACT
Ditches along busy roads are liable to pollution by heavy metals. In Louisiana, United States, animals and plants living in ditches have accumulated cadmium and lead (Naqvi et al. 1993). In the red swamp crayfish (Procambarus clarkii), the cadmium level was 32 times that in the water, and the lead level 12 times that in the water, giving bioaccumulation factors of 5.1 and 1.7, respectively.
