Trumpeter swan survey of the Rocky Mountain population, U.S. breeding segment, fall 2014

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Abstract:

Observers counted 611 swans (white birds and cygnets) in the U.S. Breeding Segment of the Rocky Mountain Population of trumpeter swans during fall 2014, a similar count to last year’s (610). The number of white birds in the Tri-state area (452) stayed about the same as last year’s count of 455. The total number of cygnets increased 24.5%, from 110 in 2013 to 137 in 2014. Cygnet counts increased from 2013 by 119.2% and 9.6% for Montana and Wyoming, respectively, while Idaho cygnet production decreased from that of 2013 by 17.8% to 23 birds. Malheur National Wildlife Refuge (NWR) conducted a ground survey this year and found 2 white birds and 1 cygnet. Eighteen white birds were observed at the Summer Lake Wildlife Management Area, which was a decrease of 25% from last year. Nevada did not provide data to this year’s swan survey. Precipitation throughout most of the Tri-state area was 70–150% of normal during winter 2013–2014. During the summer months, temperatures were 1–3 °F warmer than average and precipitation was 100–150% of normal, especially during June–August. Palmer Drought Indices for areas within the Tri-state area increased slightly for 2014.

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ELECTRONIC FILE - Zoology

SWAP (2/19/2016) citation:
[FWS] US Fish and Wildlife Service. 2014. Trumpeter swan survey of the Rocky Mountain population, U.S. breeding segment. Lakewood (CO): US Fish and Wildlife Service, Migratory Birds and State Programs. 26 p.

Probably should have been cited as Olson D. 2014. Trumpeter swan survey of the Rocky Mountain population, U.S. breeding segment. Lakewood (CO): US Fish and Wildlife Service, Migratory Birds and State Programs, Mountain-Prairie Region. 38 p.