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McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes
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McKinnon et al 2011 Reproductive success, moult and autumn migration of Wood Thrushes

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  • Fast birds arrive 14 and 22 Oct, slow birds arrive 10 Nov, 6 Dec.
  • Closed circles are ASY
  • Transcript

    • 1. The influence of reproductive success and moult on autumn migration strategy in a songbird<br />Emily A. McKinnon1<br />Kevin C. Fraser1<br />Elizabeth A. Gow1,2<br />Maggie MacPherson1<br />Calandra Q. Stanley1<br />T. Kurt Kyser3<br />Bridget J. M. Stutchbury1<br />1York University, Toronto, Canada<br />2Current: University of Saskatchewan, Saskatoon, Canada<br />3Queen’s University, Kingston, Canada<br />emilymck@yorku.ca<br />1<br />
    • 2. Outline<br />Previous work on Wood Thrushes (Hylocichlamustelina)<br />Double-brooding<br />Migration using geolocators<br />Research questions<br />Methods: geolocators and SIA<br />Results<br />Conclusions and future work<br />2<br />
    • 3. Wood thrush (Hylocichlamustelina)<br />Nearctic-Neotropical migrant<br />Population has declined 40% over 40 years<br />3<br />
    • 4. Reproductive success and carry-over effects<br />86% of successful females attempt a second brood<br />Costs for moult and migration? <br />4<br />E. Gow. Thesis, York University, Toronto, Canada<br />E. Gow et al. submitted to Auk<br />
    • 5. Wood Thrush moult<br />Energetic/time constraints at breeding sites could promote delayed moultor moult during migration<br />5<br />
    • 6. Wood thrush migration<br />Rate <br />Total (fall) stopover days<br />Arrival dates<br />Routes <br />6<br />Stutchbury et al. 2009 Science 323:896<br />Stutchbury et al. 2011. Proc. R. Soc. B. 278:131-137.<br />Stutchbury Lab unpubl. data<br />
    • 7. Fast vs. slow fall migration<br />7<br />
    • 8. Research Questions <br />Does reproductive output influence moult and or fall migration? <br />Is variation in fall migration strategy explained by moult south of breeding site? <br />8<br />
    • 9. Methods: reproductive output, moult<br />Reproductive output measured by following nests in 2008<br />Moult scored in August (# of new feathers present/growing)<br />Geolocators deployed on birds to collect data on migration<br />9<br />
    • 10. Methods: geolocator analysis<br />Geolocator light data analysed for:<br />fall migration rate (overall km/day)<br />arrival date at winter site<br />total number of fall stopover days<br />10<br />
    • 11. Methods: moulting south of breeding site<br />4 feathers in a moult sequence were sampled<br />11<br />Tertial clip<br />Primary clip<br />Secondary clip<br />
    • 12. Methods: stable-isotope analysis<br />Feathers analysed for ratios of stable-hydrogen isotopes (δD)<br />Birds classified as moult migrants if at least 1 feather grown south<br />12<br />δD<br />
    • 13. Results: Does reproductive output influence moult?<br />13<br />Yes.<br />Late breeding/double-brooding = late moulting<br /><ul><li> = SY
    • 14. = ASY</li></ul>Stutchbury et al. 2011. Proc. R. Soc. B. 278:131-137.<br />
    • 15. Does reproductive output does influence fall migration? <br />Late breeders ( rep. output) farther N on 10 Oct<br />Late fall migration departure<br />No relationship between breeding and winter arrival<br />Why? <br />14<br />Stutchbury et al. 2011. Proc. R. Soc. B. 278:131-137.<br />
    • 16. What predicts winter arrival?<br />15<br />Fall migration appears to be related to # stopover days.<br />Why such long stopovers?<br />Stutchbury et al. 2011. Proc. R. Soc. B. 278:131-137.<br />
    • 17. Evidence of moult south of breeding sites<br />16<br />5/31 (16%) individuals moulted feathers south of breeding sites<br />δD<br />www.waterisotopes.org<br />
    • 18. Moult and migration<br />No significant differences in winter arrival date or migration rate<br />Moult-migrants arrived later, migrated faster<br />17<br />
    • 19. Moult and migration<br />No significant difference in # stopover days<br />Moult-migrants had more stopover days<br />2 birds with > 3 week stopovers both grew feathers south<br />18<br />
    • 20. Conclusions<br />High reproductive output delays moult, and perhaps fall migration departure<br />High reproductive output does not influence winter arrival<br />Winter arrival date driven by # stopover days<br />16% birds moulted feathers south; no significant relationship with migration rate, winter arrival or total stopover days<br />However, small sample sizes and trends suggest more sampling needed<br />19<br />
    • 21. Implications and future work<br />If not for moult, why do some WOTH take fall ‘vacations’? <br />WOTH on extended stopover captured in Belize in October 2010 and radio-tagged<br />physiology, body condition <br />More geolocators and moult data: >100 geolocators deployed in Belize, Costa Rica, and Canada in 2011<br />+ n=25 in-hand awaiting analysis<br />Expect ~30-50 returns in winter 11/12 and summer 2012<br />20<br />
    • 22. Questions and comments<br />Thank you!<br />emilymck@yorku.ca<br />21<br />
    • 23. Acknowledgements<br />Funding: NSERC, York University, Molson Fund, Canada Research Chair, proceeds from Silence of the Songbirds<br />Many hard-working field and lab assistants<br />Queen’s Facility for Isotope Research (QFIR)<br />22<br />
    • 24. Does rep. success influence moult location? <br />5/8 double-brooded birds grew at least 1 feather S of breeding site<br />2/7 single-brooded birds show moult S of breeding site<br />Not significantly different (X2 = 3.355, p = 0.07)<br />Double-brooding does not appear to influence moult location. <br />23<br />E. Gow et al. submitted to Auk.<br />
    • 25. Winter arrival date – unimportant?<br />24<br />
    • 26. Wood thrush migration routes<br />25<br />Fall <br />Spring<br />
    • 27. Do birds moult at long stopovers? <br />11 of 13 birds have stopovers 7 days or longer<br />2 of 13 birds stop for > 3 weeks<br />26<br />Moult in Belize<br />

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