00000cam 2200000za 4500 9.855885 CaOODSP 20241203113642 cr ||||||||||| 180426s1986 onca|||#o f00| 0 eng d CaOODSP eng n-cn-on CW69-1/56E-PDF Barr, J. F. (Jack Francis) Population dynamics of the common loon (Gavia immer) associated with mercury-contaminated waters in northwestern Ontario [electronic resource] / J.F. Barr. [Ottawa] : Canadian Wildlife Service, c1986. 25 p. : ill. Occasional paper ; no. 56 Digitized edition from print [produced by Environment and Climate Change Canada]. Issued also in French under title: La dynamique des populations de huards à collier (Gavia immer) et les eaux contaminées au mercure dans le nord-ouest de l'Ontario. Includes bibliographical references. "Common Loons on lakes of the Wabigoon-English River system, northwestern Ontario, were adversely affected by unnatural, unpredictable water-Ievel fluctuations and turbidity, and by mercury contamination. Extensive, man-induced water-level changes resulted in increased desertion and predation of clutches. Increasing turbidity resulted primarily in a decrease in the number of potential territories occupied. A strong negative correlation existed between the successful use of territories by breeding loons and mercury contamination"--Abstract. gccst Aquatic birds gccst Mercury gccst Environmental impact Loons Canada. Environment Canada. Canadian Wildlife Service. La dynamique des populations de Huards à collier (Gavia immer) et les eaux contaminées au mercure dans le nord-ouest de l'Ontario (CaOODSP)9.856571 Occasional paper (Canadian Wildlife Service) no. 56 (CaOODSP)9.504780 PDF 3.85 MB https://publications.gc.ca/collections/collection_2018/eccc/CW69-1-56-eng.pdf