Garlic Mustard -- different roles of juveniles and adults?
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Transcript of Garlic Mustard -- different roles of juveniles and adults?
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Garlic Mustard: different roles of juveniles and adults?
Dr. Anne Alerding Assistant Professor of Biology
Virginia Military Institute [email protected]
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A diverse forest shows vertical stratification and high species diversity
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Stinson et al., 2007 Northeastern Naturalist 14:73–88.
Northeastern forest invasion by garlic mustard decreases plant diversity
# of Garlic mustard plants
Plant Diversity
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Invasion decreases vertical stratification (monolayer of garlic mustard)
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Garlic mustard kills fungi that help native plants grow
http://www.ctacf.org/index.cfm/2007/3/1/Mycorrhizae-and-the-American-Chestnut-An-Underground-Tale-of-Mystery
ectomycorrhizae endomycorrhizae
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Cyanopropenyl glycoside
Flavonoid glycoside
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juveniles
adults
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Project 1:
Do juveniles and adults produce the same amounts & types of chemicals?
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http://www.oardc.ohio-state.edu/weedguide/singlerecord.asp?id=330#
Year 1: Juvenile (vegetative rosette)
Year 2: Adult (reproductive)
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Field Juveniles
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Field Adults
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0
1x108
2x108
3x108
Shoots Roots
Juvenile Adult
Concentration of Peak 1
(A218/g DW)
Juveniles contain more chemicals!
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Project 2:
With altered habitat and litter inputs, are animals affected by invasion?
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We studied animals that break down litter (detritus):
Detritivores
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Springtail – an important detritivore in forest litter
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Invaded
Uninvaded
Springtails are more abundant in invaded sites
Springtail abundance
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Springtail abundance is higher in less acidic soil
Springtail abundance
Soil pH
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Soil pH is less acidic when juveniles increase in abundance
Soil pH
Juvenile Abundance (% of Total Plants)
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http://plants.usda.gov
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What can YOU do to help?
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Eat Garlic Mustard ‘til you burst!
http://www.shakerlakes.org/stewardship/uploaded_images/MustardCover-1-709530.gif