Stabilized water levels of the upper St. Lawrence River have reduced plant diversity and allowed competitively dominant taxa such as Typha x glauca and Typha angustifolia to displace productive sedge meadow habitat. This research studied the effects of two wetland enhancement techniques using habitat heterogeneity and manipulating hydrology. Dredge spoils from pothole excavations in Typha marshes were reconfigured to create habitat mounds. These habitat mounds created from an exposed seed bank had less Typha spp. and were more diverse than the surrounding remnant Typha marshes. Sedge meadow vegetation did not successfully colonize these habitat mounds. Water levels at two wetlands were raised above the water levels of the upper St. Lawrence River. Raising water levels increased floating leaf aquatic vegetation but did not decrease Typha spp. Alternative enhancement methods may be necessary to control Typha spp. while restoring sedge meadows.
|Advisor:||Leopold, Donald J.|
|Commitee:||Farrell, John M., Wilcox, Douglas A.|
|School:||State University of New York College of Environmental Science and Forestry|
|Department:||Environmental & Forest Biology|
|School Location:||United States -- New York|
|Source:||MAI 56/03M(E), Masters Abstracts International|
|Keywords:||Sedge meadow, Seed bank, Typha spp., Upper St. lawrence River wetlands, Wetland enhancement|
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