1 / 23

THE ECOLOGY OF AVIAN MIGRATION AND DISEASE Ron Ydenberg Centre for Wildlife Ecology Simon Fraser University

THE ECOLOGY OF AVIAN MIGRATION AND DISEASE Ron Ydenberg Centre for Wildlife Ecology Simon Fraser University. North America holds ~28 million shorebirds (Morrison et al. 2000) ~ 80% are in decline ( Morrison et al. 2001 ) world wide ~50% in decline (Zöckler et al. 2001). Courtesy WHSRN

kamin
Download Presentation

THE ECOLOGY OF AVIAN MIGRATION AND DISEASE Ron Ydenberg Centre for Wildlife Ecology Simon Fraser University

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. THE ECOLOGY OF AVIAN MIGRATION AND DISEASERon YdenbergCentre for Wildlife EcologySimon Fraser University

  2. North America holds ~28 million shorebirds (Morrison et al. 2000) ~ 80% are in decline (Morrison et al. 2001) world wide ~50% in decline (Zöckler et al. 2001) Courtesy WHSRN web site

  3. Hemispheric-scale research program, examining • entire annual cycle • different disciplines Simon Fraser University Centre for Wildlife Ecology Canadian Wildlife Service

  4. Seasonal return migration evolves when the fitness benefits of extra resources (reproduction) OUTWEIGH the fitness costs of return travel between habitats (survival)

  5. Western sandpipers migrate over a ‘predator landscape’

  6. Seasonal return migration evolves when the fitness benefits of extra resources (reproduction) OUTWEIGH the fitness costs of return travel between habitats (survival)

  7. Avian influenza • Ancestral to waterbirds • Maintained in wild populations • All sub-types recorded in wild birds • HP forms rarely seen in wild birds • Rapidly evolving and diversifying

  8. North America holds ~28 million shorebirds (Morrison et al. 2000) ~ 80% are in decline (Morrison et al. 2001) world wide ~50% in decline (Zöckler et al. 2001) Courtesy WHSRN web site

  9. Antonio Fauci (NIAID) 2006 Cell, Feb 24 issue

  10. Disease virulence • Transmission-virulence trade off High virulence Low virulence Pathogen production time

  11. Disease virulence • Transmission-virulence trade off High virulence Pathogen production new hosts easily found and infected time

  12. AVIAN INFLUENZA HITS THE USA

  13. Disease virulence • Transmission-virulence trade off new hosts NOT easily found and infected Pathogen production Low virulence time

  14. Factors selecting forhigh virulence • Dense host populations • Short host life span • Immunologically defenseless • ‘Cultural’ vectors

  15. Disease virulence • Parasites face a transmission-virulence trade off • Migrants would seem to present a selection scenario favoring reduced virulence • Intensive poultry production can select for high virulence • HP forms evolve independently and repeatedly

More Related