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Ecological Section

Bell, Timothy [1].

Comparing the direct negative and indirect positive effects of a root parasite on Illinois Threatened Savanna Blazing Star growth.

Savanna Blazing Star (Liatris scariosa var. nieuwlandii) is listed as Threatened in Illinois. It is a poor competitor compared to Big Bluestem Grass (Andropogon gerardii) and its population at Hickory Creek Barrens Nature Preserve is declining in response to increased density of Big Bluestem. Wood Betony (Pedicularis canadensis) is a root parasite that is known to reduce the growth of Big Bluestem but its effect on Savanna Blazing Star is unknown. The objective of this study is to determine whether the indirect positive impact of Wood Betony on Savanna Blazing Star growth through reducing Big Bluestem growth will compensate for itís potential direct negative impact on Savanna Blazing Star growth. In the greenhouse, growth and reproduction was measured for all three species grown together in pots, as well as alone and in pairs. Results from these experiments and management implications will be presented.


1 - Chicago State University, Biological Sciences, 9501 South King Drive, Chicago, Illinois, 60628-1598, United States

Keywords:
Liatris scariosa
Andropogon gerardii
Pedicularis canadensis
root parasite
threatened
Blazing Star
Wood Betony
Big Bluestem Grass.

Presentation Type: Paper
Session: 40-7
Location: Wasatch (Cliff Lodge)
Date: Tuesday, August 3rd, 2004
Time: 4:00 PM
Abstract ID:517


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