00000nam 2200000za 4500 9.857472 CaOODSP 20241203113643 cr ||||||||||| 180605s1994 bccbd ob f000 0 eng d 0662222245 0831-6481 CaOODSP eng eng fre n-cn-bc CW69-5/203E-PDF CW69-5/203E Summers, Ken R. Aerial surveys of waterfowl and gulls on the Fraser River delta, 1992-93 [electronic resource] / K. Summers, P. Hayes, R. McKelvey. Delta, B.C. : Canadian Wildlife Service, Pacific and Yukon Region, 1994. v, 64 p. : charts, map. Technical report series ; no. 203 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (p. 14). "This report presents the results of 14 weekly aerial surveys for waterfowl and gulls flown over the Fraser River estuary between mid October 1992 and mid January 1993. The data are compared to those summarized for 1966-74, 1982-83, 1983-84 and 1989-90 by McKelvey and Summers (1990). The annual estimate of dabbling duck use of the entire estuary (Boundary Bay and the Fraser River foreshore) was higher than for 1989-90 but still below that of earlier surveys. Mean total numbers of gulls were higher than for all previous surveys. Waterfowl counts were highly variable between surveys. Comparisons with mid-winter counts from the U.S. in the Pacific flyway were made. Although the Fraser River estuary showed an increase in waterfowl populations for 1992, while the flyway continued to show a decline, the overall downward trend is still apparent"--Abstract, p. ii. Issued also in print format. Includes abstract in French. Water birds Bird populations Bird surveys Fraser River Delta (B.C.) Hayes, Patricia. McKelvey, Richard W. Canada. Environment Canada. Canadian Wildlife Service. Pacific and Yukon Region. Aerial surveys of waterfowl and gulls on the Fraser River Delta, 1992-93 / (CaOODSP)9.611875 Technical report series (Canadian Wildlife Service) no. 203. (CaOODSP)9.504438 PDF 2.30 MB https://publications.gc.ca/collections/collection_2018/eccc/cw69-5/CW69-5-203-eng.pdf