Falcon's Invoice Discounting: Your Path to Prosperity
Partners in Flight 2008: Bicknell's Thrush
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2. Partners In Flight = North America Watch List IUCN Red List = Vulnerable ABC/Audubon WatchList = Red List Canada = Candidate for Federal Listing USFWS = Special Concern ME, NH, NY, VT = Special Concern www.bicknellsthrush.org
3. “ Differential mortality of females during the non-breeding season, resulting from effects of dominance, may thus also contribute to the male-biased sex ratio observed in breeding populations of redstarts and perhaps other species of socially monogamous birds.” (Marra and Holmes 2001) Hispaniola Dominican Republic Haiti
4. n=4 n=4 n=10 n=3 n=5 n=7 Overall mean = 2.2 males : female n = number years Breeding Adult Sex Ratios Gaspe and Gosford data provided by Yves Aubry, Canadian Wildlife Service
20. Leading Cause of Winter Mortality = Introduced Rats 1/5 2008, 3/15 in 2007, 1/26 2006
21. Age comparison of Toe nail 13 C values P =0.0159 n=39 (SY=18, ASY=21) t =2.03 13 C values are significantly different between SY (5) and ASY (6) birds Suggests habitat use/ segregation by age SY birds in wetter sites dominated by C 3 plants K. Fraser
22. Where are Females Limited? Nest 1:1 sex ratio in clutch Fledge Post Fledging Dispersal 1:1 1:1 Fall Migration 1:1 ? Ratio ? 2:1 Spring Migration 2:1 Breeding Grounds >2:1 Primary Forest >2:1 Disturbed Forest ~1:1 Habitat and Territory Selection