Aerial surveys for breeding waterfowl, Atlantic Region, 1985-1989 / A.J. Erskine ... [et al.].: CW69-5/85E-PDF
"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.
Permanent link to this Catalogue record:
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| Department/Agency | Canada. Environment Canada. Canadian Wildlife Service. Atlantic Region. |
|---|---|
| Title | Aerial surveys for breeding waterfowl, Atlantic Region, 1985-1989 / A.J. Erskine ... [et al.]. |
| Series title | Technical report series ; no. 85 |
| Publication type | Series - View Master Record |
| Language | [English] |
| Format | Electronic |
| Electronic document | |
| Note(s) | Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (p. 9-10). Issued also in print format. Includes abstract in French. |
| Publishing information | Sackville, N.B. : Canadian Wildlife Service, Atlantic Region, 1990. |
| Author / Contributor | Erskine, Anthony J., 1931- |
| Description | 11 p. : map. |
| Catalogue number |
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| Subject terms | Black ducks Waterfowl Aerial surveys Atlantic Provinces |