00000nam 2200000za 4500 9.856771 CaOODSP 20241203113643 cr ||||||||||| 180518s1991 oncb ob f000 0 eng d 0662185234 0831-6481 CaOODSP eng eng fre n-cn-on CW69-5/117E-PDF CW69-5/117E Blokpoel, H., 1938- Distribution and abundance of colonial waterbirds nesting in the Canadian portions of the lower Great Lakes system in 1990 [electronic resource] / Hans Blokpoel, Gaston D. Tessier. Nepean, Ont. : Canadian Wildlife Service, Ontario Region, 1991. iii, 16 p. : maps. Technical report series ; no. 117 Imperfect copy: cover and verso of cover are wanting. Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (p. 13-16). "The Canadian portions of the lower Great Lakes system (St. Clair River, Lake St. Clair, Detroit River, Lake Erie, Niagara River, Lake Ontario, and the St. Lawrence River from Kingston to Cornwall) were surveyed during the 1990 breeding season and nest counts were made at all colonies of Double-crested Cormorant (Phalacrocorax auritus), Ring-billed Gull (Larus delawarensis), Herring Gull (L. argentatus), Great Black-backed Gull (L. marinus), Common Tern (Sterna hirundo), and Caspian Tern (S. caspia)"--Abstract, p. i. Issued also in print format. Includes abstract in French. Water birds Bird surveys Ontario Great Lakes Tessier, G. D. Canada. Environment Canada. Canadian Wildlife Service. Ontario Region. Technical report series (Canadian Wildlife Service) no. 117. (CaOODSP)9.504438 PDF 780 KB https://publications.gc.ca/collections/collection_2018/eccc/cw69-5/CW69-5-117-eng.pdf