large and fine scale resiliency: alder disease in alaska lori trummer, usfs christa mulder, uaf...
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Large and Fine Scale Resiliency: Alder Disease in Alaska
Lori Trummer, USFSChrista Mulder, UAFBarbara Roy, U of OregonRoger Ruess, UAFGerald Adams, MSUGlen Stanosz, U of WisconsinLori Winton, USDA
Jennifer Rohrs-Richey
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Alders (Alnus spp.)
Alnus crispa (uplands)
Alnus tenuifolia (floodplain)
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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!”
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Forest Service Investigating Dying AldersWed, 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)
Alaska Public Radio Network (APRN)
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SoilNitrogenBank
N
Why are alders essential to ecosystem health?
N-fixing bacteria
N2
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Dieback and Mortality
Chena River
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Canker Fungi: Cytospora canker (Valsa melanodiscus)
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Natural Injuries for Pathogen Entry
River Ice Hare Browsing
RubbingSnow Loading
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Colonization of Stem
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Resilience on the Landscape
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Fine scale resilience: Host control, physiology
Resiliency: Large vs. fine scale
Large scale resilience: Location on the landscape (siltbar, stand density, age)
Ecosystem resilience requires both large and fine scales
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Physiological Damage to Alder
Local symptom with systemic affects
Pink– healthy tissue
Tan– dead tissue
Canker blocks water and nutrient transport
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H2O
CO2
H2O
CO2
Leaf Surface: Strategy for Coping with Stress
OpenClosing
Optimum: conserve water AND maintain positive carbon balance
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Can we influence resilience at both of these levels?
Can we reduce vulnerability (stresses)?
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Degrading Resilience on the Landscape
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Less destructive clearing practices
Reducing Vulnerability to Disease
Human perception of alders works against maintaining resilience
How to bring the social and ecological dynamics into conversation?
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Research Support
National Institute for Global Environmental Change
U.S. Forest Service
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Alder Physiology
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2003 20041930 2005
Photo credit:Lori Trummer
BeginMonitoring
Cytospora canker isolated
Valsa alnichecklists
Timeline
2007
Forest Health Report
Experimental Inoculations
2006
Generating working hypotheses about disease
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Quantifying Fine-Scale Resilience
Research Results:
Water Loss
Pho
tosy
nthe
is
(Car
bon
Upt
ake)
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Agenda
Canker disease
Fine-scale resilience in alders
Disease on the landscape (Interior)
Alders in Alaska