Establishment and impact of Lythrum salicaria on wetlands.
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Transcript of Establishment and impact of Lythrum salicaria on wetlands.
![Page 1: Establishment and impact of Lythrum salicaria on wetlands.](https://reader036.fdocuments.net/reader036/viewer/2022062516/56649d775503460f94a59301/html5/thumbnails/1.jpg)
Establishment and impact of Establishment and impact of LythrumLythrum salicaria salicaria on wetlandson wetlandsEstablishment and impact of Establishment and impact of
LythrumLythrum salicaria salicaria on wetlandson wetlands
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L. salicariaL. salicaria, an invasive weed, an invasive weed
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• Common name, Purple loosestrife
• Considered one of the worst invasive, non-native species
• Forms dense homogenous stands
• Highly reproductive• Competes vigorously
with native plant species
Morrison, 2002
Thompson et al., 1987
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Prevailing hypothesisPrevailing hypothesis
• L. salicaria out-competes native vegetation
• Forms dense monospecific stands that restrict native wetland plants
• High competitive ability
• Reduces habitat for flora and fauna
Thompson et al., 1987
Dech and Nonsko, 2001
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Distribution of Distribution of L. salicariaL. salicaria
Distribution as of 1985 Distribution as of 2001
Thompson et al., 1987 National Agricultural Pest Information System
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Structure, growth forms, and field Structure, growth forms, and field identification characters of L. salicariaidentification characters of L. salicaria
Thompson et al., 1987Robert H. Mohlenbrock
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Debates and argumentsDebates and arguments
• No experimental documentation of reduced or displaced native plants
• No quantitative measurements of monospecific stands
• May undergo large population fluctuations
• Evidence of fauna utilization
David Brenner, Michigan Sea Grant
Hager and McCoy, 1998 Keller, 2000
Treburg and Husband, 1999
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Displacement by L. salicariaDisplacement by L. salicaria
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18 June, 1968 16 August, 1978
Montezuma National Wildlife Refuge, New York
Thompson et al., 1987
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Biological Control of L. salicariaBiological Control of L. salicaria
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• Much debate still occurs
• Four species were selected
• Two native European beetles, a root-boring weevil, and a flower feeding weevil that all feed on L. salicaria
• Studies have shown success with Galerucella species
Galerucella spp.
Hilobuis transversovittiatus
Nanophyes marmoratusOregon State University Blossey et al., 2001
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Effects of biological controlEffects of biological control
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Winchester Wasteway, Central Washington
August 1995 August 1998
Bureau of Reclamation