00000nam 2200000za 4500 9.856434 CaOODSP 20241203113643 cr ||||||||||| 180510s1990 nkcb ob f000 0 eng d 0662174054 0831-6481 CaOODSP eng eng fre n-cn-nf n-cnm-- CW69-5/85E-PDF CW69-5/85E Aerial surveys for breeding waterfowl, Atlantic Region, 1985-1989 [electronic resource] / A.J. Erskine ... [et al.]. Sackville, N.B. : Canadian Wildlife Service, Atlantic Region, 1990. 11 p. : map. Technical report series ; no. 85 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (p. 9-10). "With continuing concern over declines in numbers of Black Ducks (Anas rubripes), efforts to monitor breeding populations of this species were renewed in the Atlantic Provinces, beginning in 1983. Helicopter surveys in spring were begun in New Brunswick in 1985, and extended to Nova Scotia and the island of Newfoundland in 1986. These pilot projects were proposed to continue for 5 years (through 1990). Observed breeding densities were highest in N.B. and lowest in Nfld., presumably reflecting a temperate to boreal/subarctic trend. Densities increased each year in N.B. but less consistently in the other provinces. The apparent increases may reflect general recovery of populations following harvest restrictions in the U.S.A. since 1982, but the trends are not (yet) conclusive"--Abstract. Issued also in print format. Includes abstract in French. Black ducks Waterfowl Aerial surveys Atlantic Provinces Erskine, Anthony J., 1931- Canada. Environment Canada. Canadian Wildlife Service. Atlantic Region. Technical report series (Canadian Wildlife Service) no. 85. (CaOODSP)9.504438 PDF 9.85 MB https://publications.gc.ca/collections/collection_2018/eccc/cw69-5/CW69-5-85-eng.pdf