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accumulation adult Agassiz NWR aldrin already discussed amounts of dieldrin appear birds bottom sediments breeding grounds Chase Lake Chlorinated hydrocarbons colonies comm contamination CORMORANT AND PELICAN DDT and TDE DDT-residues DDT-type residues dead eggs detected Dieldrin residues diet dietary Dog Lake double-crested cormorant egg-laying endrin euoN factors fish residues Fish-eating food-web gulls H CD H H H H rH heptachlor incubation insecticide interior intraspecific J. A. Keith Keith and Hunt Kury Lake DuBay Lake Garrison Lake Michigan Lake Winnipegosis large numbers lindane live and dead Manitoba McLeod and Bondar metabolism migratory morant nests North Dakota numbers of nonbreeding observed pelican egg residues Pelican Lake pelicans and cormorants pheasants pools ranged reported by Hickey residue levels rH rH Salyer Saskatchewan sediment sample sediments species study areas suggest Suggi Lake total ppm total residues toxaphene toxic trophic levels University of Wisconsin wet-weight white pelican Wildlife Ecology Woodwell