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In Alaska, hundreds of hours were flown by many survey crews during late summer in seven years to conduct a census of all occupied Trumpeter Swan (Cygnus buccinator) habitat (range 46,729 km2 in 1968 to 123,857 km2 in 2000). The total number of adult Trumpeter Swans increased from 1,924 to 13,934 between 1968 and 2000, a 624% increase. Population trends varied among eleven distinct geographical areas. Swan numbers increased in both high quality core habitat as well as in peripheral habitat added during the survey period. Although the Trumpeter Swan population summering in Alaska continues to grow, a comprehensive Alaska Trumpeter Swan Management Plan is needed to ensure that swans remain well distributed and a complete...
Categories: Publication; Types: Citation; Tags: B5-Trumpeter Swans
In Alaska, hundreds of hours were flown by many survey crews during late summer in seven years to conduct a census of all occupied Trumpeter Swan (Cygnus buccinator) habitat (range 46,729 km2 in 1968 to 123,857 km2 in 2000). The total number of adult Trumpeter Swans increased from 1,924 to 13,934 between 1968 and 2000, a 624% increase. Population trends varied among eleven distinct geographical areas. Swan numbers increased in both high quality core habitat as well as in peripheral habitat added during the survey period. Although the Trumpeter Swan population summering in Alaska continues to grow, a comprehensive Alaska Trumpeter Swan Management Plan is needed to ensure that swans remain well distributed and a complete...
Categories: Publication; Types: Citation; Tags: B5-Trumpeter Swans
Survey data for trumpeter swans were collected throughout Alaska since 1968, but due to design difficulties and past analytical limitations, previous analyses were limited to simple summary statistics. The main purpose of my work was to rigorously analyze these data using advanced methods and determine rates of population change, the effects of environmental change on habitat use, and the influences of habitat features on habitat occupancy. I estimated that the adult population grew at a rate of 5.9% (95% credible interval = 5.2% to 6.6%) and production of cygnets increased at 5.3% (95% credible interval = 2.2% to 8.0%) annually. I also found evidence that variation in occupancy was positively related to average...
During the period 1970-2000, substantial efforts were made to document the distribution and number of Trumpeter Swans (Cygnus buccinator) in western Canada. Breeding surveys have expanded from covering less than 20,000 km2 in the Grande Prairie region of Alberta to cover 780,000 km2, perhaps one-third of northwestern Canada. Aerial surveys involving total or partial counts have been used in most areas. Since 1995, sample-based surveys have been used in Yukon Territory and extreme northern British Columbia. Between 1970 and 2000, breeding surveys have documented a dramatic increase in both breeding distribution and numbers in western Canada (100 to more than 3,700). Winter surveys in British Columbia have corroborated...
Categories: Publication; Types: Citation; Tags: B5-Trumpeter Swans, M1-Birds
In Alaska, hundreds of hours were flown by many survey crews during late summer in seven years to conduct a census of all occupied Trumpeter Swan (Cygnus buccinator) habitat (range 46,729 km2 in 1968 to 123,857 km2 in 2000). The total number of adult Trumpeter Swans increased from 1,924 to 13,934 between 1968 and 2000, a 624% increase. Population trends varied among eleven distinct geographical areas. Swan numbers increased in both high quality core habitat as well as in peripheral habitat added during the survey period. Although the Trumpeter Swan population summering in Alaska continues to grow, a comprehensive Alaska Trumpeter Swan Management Plan is needed to ensure that swans remain well distributed and a complete...
Categories: Publication; Types: Citation; Tags: B5-Trumpeter Swans
During the period 1970-2000, substantial efforts were made to document the distribution and number of Trumpeter Swans (Cygnus buccinator) in western Canada. Breeding surveys have expanded from covering less than 20,000 km2 in the Grande Prairie region of Alberta to cover 780,000 km2, perhaps one-third of northwestern Canada. Aerial surveys involving total or partial counts have been used in most areas. Since 1995, sample-based surveys have been used in Yukon Territory and extreme northern British Columbia. Between 1970 and 2000, breeding surveys have documented a dramatic increase in both breeding distribution and numbers in western Canada (100 to more than 3,700). Winter surveys in British Columbia have corroborated...
Categories: Publication; Types: Citation; Tags: B5-Trumpeter Swans, M1-Birds


map background search result map search result map Changes in the Abundance and Distribution of Trumpeter Swans in Denali National Park and Preserve, Alaska Changes in the Abundance and Distribution of Trumpeter Swans in Denali National Park and Preserve, Alaska