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

5. Recapture Probability for Mansfield and Stratton

6. n=5 nests n=5 nests Nestling Sex Ratios n=16 chicks n=26 chicks Gaspe data provided by Yves Aubry, Canadian Wildlife Service

7. Are females limited during annual cycle? If so, where?

8. 2004 PCR Sexing Results 1:1 Equal n=25 4:1 Male n=18 3.8:1 Male n=25 1.9:1 Male Island-Wide (n= 142 captures) First-year birds island-wide: 2.1:1 male n=38 2.4:1 Male n=17

12. Mid-winter Mean Sex Ratios n=8 years

14. Sierra de Bahoruco BITH Territories 0.372 0.218

15. 1 st Year Male Adult Female Adult Male Adult Male 1 st Year Male Adult Female

17. Mid-winter Sex Ratios n=8 years n=4 years

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