Sélection de la langue

Gouvernement du Canada / Government of Canada

Recherche

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.

Lien permanent pour cette publication :
publications.gc.ca/pub?id=9.856434&sl=1

Renseignements sur la publication
Ministère/Organisme
  • Canada. Environment Canada.
  • Canadian Wildlife Service. Atlantic Region.
TitreAerial surveys for breeding waterfowl, Atlantic Region, 1985-1989 / A.J. Erskine ... [et al.].
Titre de la série
  • Technical report series ; no. 85
Type de publicationMonographie - Voir l'enregistrement principal
Langue[Anglais]
FormatTexte numérique
Document électronique
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.
Information sur la publication
  • Sackville, N.B. : Canadian Wildlife Service, Atlantic Region, 1990.
Auteur / Contributeur
  • Erskine, Anthony J., 1931-
Description11 p. : map.
Numéro de catalogue
  • CW69-5/85E-PDF
Descripteurs
Demander des formats alternatifs
Pour demander une publication dans un format alternatif, remplissez le formulaire électronique des publications du gouvernement du Canada. Utilisez le champ du formulaire «question ou commentaire» pour spécifier la publication demandée.

Détails de la page

Signaler un problème ou une erreur sur cette page
Date de modification :