Biological Control of Purple Loosestrife Using Gallerucella Beetles

Show simple item record Palmer, Jessica
dc.contributor.advisor Grese, Robert 2007-12-04T20:43:12Z NO_RESTRICTION en_US 2007-12-04T20:43:12Z 2007-12-11 2007-12-03
dc.description.abstract Since the early 1990’s, use of Galerucella beetles for biological control projects of purple loosestrife (Lythrum salicaria L.) has exhibited positive results in decreasing purple loosestrife stands and may aid in the re-establishment of native species communities. I looked at data taken over a nine year period from permanent research plots where Galerucella beetles were released at the University of Michigan’s Matthaei Botanical Gardens in Ann Arbor, Michigan. A path analysis was used to determine the relationship between beetle defoliation, purple loosestrife reproductive success, and native plant composition. I also compared data between years to determine where, in the course of the biocontrol program, purple loosestrife reaches its lowest density and native species begin to show signs of recovery. I found that purple loosestrife height mediates the effect of beetles on the number of plant inflorescences and that when inflorescence number and height decrease there is an increase in the floristic quality index of the native community. Sites with lower disturbance and less severe purple loosestrife invasions react positively to beetle introduction more quickly than sites with higher disturbance and purple loosestrife density. In the sites studied, approximately six years after beetle introduction, purple loosestrife reached an all time low, which suggests this as an ideal time to implement supplementary restoration techniques in order to further control the invasive population and aid in the restoration of native species. en_US
dc.format.extent 1434343 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.subject Loosestrife en_US
dc.subject Galerucella Beetles en_US
dc.subject.other Re-establishment of Native Species Communities en_US
dc.title Biological Control of Purple Loosestrife Using Gallerucella Beetles en_US
dc.type Thesis en_US
dc.description.thesisdegreename Master of Science en_US
dc.description.thesisdegreediscipline Natural Resources and Environment en_US
dc.description.thesisdegreegrantor University of Michigan en_US
dc.contributor.committeemember Allan, J. David
dc.identifier.uniqname jmpalm en_US
dc.description.bitstreamurl en_US
dc.owningcollname Dissertations and Theses (Ph.D. and Master's)
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