| Titre : | Patterns of distribution and abundance of Greater Snow Geese on Bylot Island, Nunavut, Canada 1983-1998. |
| Auteurs : | A. Reed, Auteur ; R. J. Hughes, Auteur ; H. Boyd, Auteur |
| Type de document : | Article |
| Dans : | Wildfowl (53 2002) |
| Article en page(s) : | 53-65 |
| Langues: | Anglais |
| Résumé : | To monitor the numbers and distribution of Greater Snow Geese at the largest breeding colony in the eastern Canadian High Arctic, surveys were conducted on Bylot Island at five year intervals from 1983 to 1998. The surveys were conducted during the brood-rearing period using a stratified sampling procedure and aerial photography. The total number of adult geese increased from 25,500 (SE 2582) in 1983 to 69,500 (SE 8645) in 1993 (a year of exceptionally high breeding effort and breeding success) before dropping slightly in 1998. The number of goslings also increased from 26,500 (SE 2320) in 1983 to 86,500 (SE 8147) in 1993, and also dropped slightly in 1998. In years of high breeding success (1983 and 1993) the adult population on Bylot Island represented 14% of the entire world population of Greater Snow Geese. The adult population on Bylot Island between 1983 and 1998 showed an average annual rate of increase of 7%, similar to the 9% increase recorded for the entire population. Brood densities varied from a low of 0.8 broods km-2 in the poorest quality habitats in 1983 to 29.9 broods km-2 in the best habitats in 1993, but an increasing trend was evident in all habitat strata over the course of the study. A large proportion (63%) of the surface area of the colony accommodated only very low brood densities in 1983, but by 1993 the proportion occupied by such low densities had been reduced to 29%. It is concluded that the increase in goose numbers and the spread of higher brood densities over a larger portion of the colony are indications that the carrying capacity of the Island has not yet been reached. |
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