00000nam 2200000za 4500 9.858785 CaOODSP 20241203113643 cr ||||||||||| 180710s2007 bcc |ot f|0| 0 eng d 0-662-45236-2 CaOODSP eng eng fre n-cn-bc CW69-5/475E-PDF Breault, André M., 1961- Breeding distribution and abundance of trumpeter swans (Cygnus buccinators) in British Columbia, summer 2005 [electronic resource] / André Breault, Bruce Harrison, Steve Shisko. Delta, B.C. : Canadian Wildlife Service, Pacific and Yukon Region, 2007. v, 34 p. : figures. Technical report series ; no. 475 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographic references. "This report presents the results of the Trumpeter Swan (Cygnus buccinator) breeding survey conducted in British Columbia in 2005 and a summary of similar surveys conducted since 1985. Aerial (fixed-wing) surveys were conducted over the known breeding range of Trumpeter Swans in the province in mid-August 2005, to coincide with the brood-rearing period of flightless young. The population of Trumpeter Swans breeding in British Columbia was estimated at 1,126 birds (808 adults and 318 cygnets) in 2005, the highest recorded since 1985. Brood size averaged 2.66 young per brood. The Rocky Mountain population (905 birds in 2005) remains larger than the Pacific Coast population (221 birds in 2005). The breeding population of Trumpeter Swans in British Columbia has grown at an estimated (arithmetic) rate of annual increase (r) of 10.7% between 1985 and 2005. Range extension into previously unoccupied breeding areas accounts for much of this growth"--Abstract, p. i. Issued also in print format. Includes abstract in French. gccst Aquatic birds gccst Nature conservation Harrison, Bruce. Shisko, Steve. Canada. Environment Canada. Canadian Wildlife Service. Pacific and Yukon Region. Breeding distribution and abundance of trumpeter swans (Cygnus buccinator) in British Columbia, summer 2005 / (CaOODSP)9.618200 Technical report series (Canadian Wildlife Service) no. 475. (CaOODSP)9.504438 PDF 7.14 MB https://publications.gc.ca/collections/collection_2018/eccc/cw69-5/CW69-5-475-eng.pdf CW69-5/475E