Dose-tissue relationships for dieldrin in nestling black-billed magpies

We conducted an "in-nest" dosing study using dieldrin and nestling black-billed magpies (Pica pica) to 1) examine the relationship between dose and tissue residues, and 2) evaluate lethal and non-lethal tissue samples as measures of exposure. Our study was conducted during the magpie breeding season in 1997 as part of a larger project evaluating magpies as biomonitors for organochlorine contaminants at the Rocky Mountain Arsenal National Wildlife Refuge (Refuge) in Denver, Colorado. The information gained from this study will be used to aid in the interpretation of magpie tissue samples collected on the Refuge and in the design of a long-term biomonitoring program.