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Large and Fine Scale Resiliency: Alder Disease in Alaska

Large and Fine Scale Resiliency: Alder Disease in Alaska . Jennifer Rohrs-Richey. Lori Trummer, USFS Christa Mulder, UAF Barbara Roy, U of Oregon Roger Ruess, UAF Gerald Adams, MSU Glen Stanosz, U of Wisconsin Lori Winton, USDA. Alders ( Alnus spp.). Alnus crispa (uplands).

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Large and Fine Scale Resiliency: Alder Disease in Alaska

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  1. Large and Fine Scale Resiliency: Alder Disease in Alaska Jennifer Rohrs-Richey Lori Trummer, USFS Christa Mulder, UAF Barbara Roy, U of Oregon Roger Ruess, UAF Gerald Adams, MSU Glen Stanosz, U of Wisconsin Lori Winton, USDA

  2. Alders (Alnus spp.) Alnus crispa (uplands) Alnus tenuifolia (floodplain)

  3. Comments About Alders “Are alders weeds?” “Nobody really cares about alders in DNP. There are so many other cool things to study here.” “I hate alders!”

  4. Alaska Public Radio Network (APRN) Forest Service Investigating Dying Alders Wed, April 29, 2009  Posted in Alaska News For the past few years the U-S Forest Service has been investigating the cause of a massive die off of Alders across much of Alaska stretching from Nome down to Skagway. Mike Mason, KDLG - Dillingham Download Audio (MP3)

  5. Why are alders essential to ecosystem health? N2 Soil Nitrogen Bank N-fixing bacteria N

  6. Dieback and Mortality Chena River

  7. Canker Fungi: Cytospora canker(Valsa melanodiscus)

  8. Natural Injuries for Pathogen Entry River Ice Hare Browsing Snow Loading Rubbing

  9. Colonization of Stem

  10. Resilience on the Landscape

  11. Resiliency: Large vs. fine scale Large scale resilience: Location on the landscape (siltbar, stand density, age) Fine scale resilience: Host control, physiology Ecosystem resilience requires both large and fine scales

  12. Physiological Damage to Alder Pink– healthy tissue Tan– dead tissue Canker blocks water and nutrient transport Local symptom with systemic affects

  13. Leaf Surface: Strategy for Coping with Stress H2O H2O CO2 CO2 Closing Open Optimum: conserve water AND maintain positive carbon balance

  14. Can we influence resilience at both of these levels? Can we reduce vulnerability (stresses)?

  15. Degrading Resilience on the Landscape

  16. Reducing Vulnerability to Disease Less destructive clearing practices Human perception of alders works against maintaining resilience How to bring the social and ecological dynamics into conversation?

  17. Research Support National Institute for Global Environmental Change U.S. Forest Service This research is supported by the Center for Global Change, Arctic Institute of North America, the U.S. Forest Service, and the Western Regional Center of the National Institute for Global Environmental Change.

  18. Alder Physiology

  19. Timeline 2006 2007 1930 2003 2004 2005 Experimental Inoculations Begin Monitoring Valsaalni checklists Forest Health Report Cytospora canker isolated Generating working hypotheses about disease Photo credit: Lori Trummer

  20. Research Results: Quantifying Fine-Scale Resilience Photosyntheis (Carbon Uptake) Water Loss

  21. Agenda Alders in Alaska Canker disease Disease on the landscape (Interior) Fine-scale resilience in alders

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