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Large Increase in Duck Production at Agassiz Refuge
Midwest Region, September 8, 2005
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Duck production in 2005 was estimated using the traditional brood surveys conducted on 6 July and 18 August. The brood surveys were conducted by observers in the cab of the pickups and not by observers standing in the back of the pickup. As determined in previous years, a correction factor of 65 percent was used to make the production estimate comparable to past data.

Sixty-two dabbler and 93 diver broods were sighted during the roadside surveys. The 65 percent correction factor raises this to a total of 238 broods. Using average brood sizes of 6 and 5.25 for dabblers and divers respectively the traditional model gives an estimated production of 9,406 dabblers and 12,346 divers for a total of 21,752 ducklings. This is a 90 percent increase over last year and well above the long term average production of 13,263. This estimate is the highest since the late 1970's when production estimates were between 19,000 and 23,000 for a four year period. Blue-winged teal broods out numbered mallards in the dabbler category for the first time in many years and redheads out numbered ring-necked ducks and canvasbacks in the diver category for the first time since 1999. This year's pair count was just below average but did substantiate an increase in redhead pairs which exceeded the number of ring-necked duck pairs for the first time in many years. The large increase in duck production was not anticipated since there would have been nest loss due to flooding on Agassiz and Farmes pools during June. In the past some large production estimates have been questioned because of drought conditions concentrating broods in road ditches. This was not the case this year and only Lower CCC and Madsen pools were in drawdown.

Contact Info: Midwest Region Public Affairs, 612-713-5313, charles_traxler@fws.gov



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