Abstract
Purple loosestrife ((Lythrum salicaria L.)) is a beautiful but aggressive invasive plant species that has adversely affected wetlands throughout many areas of southern Canada and the northern United States. Following construction and during restoration of the Portland Natural Gas Transmission System (PNGTS) Pipeline and Joint Facilities pipelines within northern New England, invasive species surveys of the approximately 200 miles of rights-of-way were conducted in the summer of 2001. The intent of this qualitative and generalized quantitative review of project areas was to determine the extent and location of two invasive plant species populations: purple loosestrife and common reed (Phragmites australis (Cav.)). Specifically, all project wetlands and surrounding areas were monitored during the later portion of the growing season. This time period was selected because both invasive species are easily identifiable, with the distinctive flower of purple loosestrife in full bloom and the fluffy gray/tan seed heads of common reed fully developed. This Invasive Species Monitoring Program was designed with specific monitoring protocols to achieve two main goals: first, to distinguish between those areas where invasive species pre-existed the construction of the Project, and secondly, to identify newly infested areas.
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