Invasive Plant Species in Diked vs. Undiked Great Lakes Wetlands |
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| Affiliation: | 1. Institute of Nature and Environmental Technology, Kanazawa University, Kanazawa 920-1192, Japan;2. Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies, Tsukuba 305-8506, Japan;3. Suma-shofu High School, Kobe 654-0155, Japan;4. Graduate School of Science, Kobe University, Kobe 657-8501, Japan;5. Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan;1. Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;2. UCD Dooge Centre for Water Resources Research, School of Civil Engineering, Newstead Building, University College Dublin, Belfield, Dublin 4, Ireland;3. School of Civil and Environmental Engineering, University of Technology Sydney, Broadway, NSW 2007, Australia;1. U.S. Geological Survey, Western Ecological Research Center, Davis, CA, USA;2. Louisiana Universities Marine Consortium, Chauvin, LA, USA;1. Agriculture Victoria, AgriBio, Centre for AgriBioscience, Bundoora, Victoria 3083, Australia;2. Department of Ecology, Environment and Evolution, La Trobe University, Bundoora, Victoria, 3086, Australia;3. U.S Army Engineer Research and Development Center, Vicksburg, MS, 39180, USA;4. Victorian Department of Economic Development, Jobs, Transport and Resources, Melbourne, Victoria, Australia;5. Department of Zoology and Entomology, Rhodes University, Grahamstown, 6140, South Africa |
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| Abstract: | We compared the standing vegetation, seed banks, and substrate conditions in seven pairs of diked and undiked wetlands near the shores of Lake Michigan and Lake Huron, North America. Our analysis tested the null hypothesis that construction of artificial dikes has no effect on the vulnerability of Great Lakes coastal wetlands to non-native and native invasive species. Both the standing vegetation and seed banks in diked wetlands contained significantly more species and individuals of invasive plants. In addition, diked wetlands exhibited significantly higher levels of organic matter and nutrient levels, and significantly higher average pH. Two pervasive non-native invasive species in the Great Lakes region, Lythrum salicaria (purple loosestrife) and Phalaris arundinacea (reed canary grass) were significantly more abundant in diked wetlands. Typha spp. (cattail) also formed a much higher percent vegetation cover in the diked wetlands. Our results support the view that diking of shoreline wetlands modifies natural hydrologic regimes, leading to nutrient-rich aquatic environments that are vulnerable to invasion. The shallower, more variable water levels in non-diked wetlands, on the other hand, appear to favor another undesirable invasive species, Phragmites australis (common reed grass). |
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