00000nam 2200000za 4500 9.855699 CaOODSP 20241203113642 cr ||||||||||| 150406s1994 oncb #o f000 0 eng d 0662225163 0576-6370 CaOODSP eng eng fre n-cn-nl CW69-1/85E-PDF CW69-1/85E Ewins, Peter J. Caspian terns on the Great Lakes [electronic resource] : organochlorine contamination, reproduction, diet, and population changes, 1972-91 / Peter J. Ewins ... [et al.]. Ottawa, Ont. : Canadian Wildlife Service, Environment Canada, c1994. 30 p. : map. Occasional paper ; no. 85 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references. "The Great Lakes of North America are one of the most heavily contaminated freshwater ecosystems in the world, yet they support at least one-third of North America's breeding Caspian Terns Sterna caspia. To assess the health of this breeding population in relation to organochlorine contaminant (OC) levels, we studied 16 colonies (6800 nests) throughout its Great Lakes range in 1991."--Abstract, p. 3. Includes an abstract in French. gccst Aquatic ecosystems gccst Birds Canada. Environment Canada. Canadian Wildlife Service. Occasional paper (Canadian Wildlife Service) no. 85 (CaOODSP)9.501188 PDF 2.76 MB https://publications.gc.ca/collections/collection_2018/eccc/CW69-1-85-eng.pdf