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Describes a project to identify non-native plants in Alaska, to determine which of these plants pose the greatest threat to native ecosystems, and to conduct field surveys in Susitna, Matanuska, and Copper River basins, which are considered ecologically disturbed. This data was used in part to populate the AlaskaExotic Plant Information Clearinghouse (AKEPIC) database
The ambermarked birch leafminer (AMBLM) (Profenusa thomsoni ) is an invasive leafminer native to the Palearctic from the United Kingdom to Turkey to Japan. It was introduced to the eastern United States in 1921 and has since spread to the mid-western U.S. states and Canadian provinces. This leafminer was introduced to Alaska in 1996, where it has since spread over 140,000 acres, from Haines to Fairbanks. The most severe damage is found throughout the Anchorage bowl, which extends south to Girdwood and North to Wasilla. The damage caused by P. thomsoni can be severe, defoliating entire trees. In 2006, it was noted that urban areas in Alaska experienced higher densities of AMBLM leafminer than adjacent forested areas....
Invading plants may cause biochemical changes to native plants by altering resource availability, thereby also changing the forage quality of native plants for native browsers. I measured plant growth, carbon and nitrogen content, and tannin and total phenolic production, which generally lower forage quality, in the boreal native Salix alaxensis under differing scenarios of invasion by nitrogen-fixing Melilotus alba . Additionally, I evaluated whether different populations of M. alba in Alaska suspected of having different introduction histories varied in competitive ability. I found that in this common garden experiment shading and soil nitrogen levels consistent with those found in M. alba populations did not...
Northern pike (Esox lucius) were introduced to the northern Susitna Basin of south-central Alaska in the 1950's, and have since spread throughout the upper Cook Inlet Basin. It is hypothesized here that invasive pike remodel the ecology of lakes in this region by removing vulnerable prey types. Trends in invasive diet suggest that pike switch to macroinvertebrate prey as fish prey are eliminated. Impacts of pike introduction were studied in detail for one species of resident fish, the threespine stickleback ( Gasterosteus aculeatus) to test hypotheses that invasive pike predation both reduces stickleback abundance and drives evolution of trophic and armor morphology in surviving populations. Stickleback abundance...
Ambermarked birch leafminer, Profenusa thomsoni (Konow) (Hymenoptera: Tenthredinidae), is an exotic, invasive pest of urban and wildland birch, Betula spp., in portions of North America. Profenusa thomsoni was first reported in the eastern United States in the early 1900s and has spread rapidly throughout the northern United States and Canada (MacQuarrie et al. 2007, Can. Entomol. 139: 545 - 553). The most likely mode of introduction was overwintering pupae present in the root balls of horticultural stock imported from Europe (Digweed and Langor 2004, Can. Entomol. 136:727 - 731), although this has not been documented. In Alaska, 3 exotic birch leaf mining sawflies have been found in recent years with the most significant...
map background search result map search result map BAER Final Report; Invasive Plant Monitoring Following 2004 Fires. USFWS National Wildlife Refuges – Alaska Region. Prepared for the U.S. Fish and Wildlife Service- Alaska Regional Office BLM-BAER Final Report. Invasive Plant Species Monitoring and Control: Areas Impacted by 2004 and 2005 Fires in Interior Alaska. A survey of Alaska BLM lands along the Dalton, Steese, and Taylor Highways The impact of invasive sweetclover (Melilotus alba) in early-successional floodplain habitats of Alaska The impact of invasive sweetclover (Melilotus alba) in early-successional floodplain habitats of Alaska BLM-BAER Final Report. Invasive Plant Species Monitoring and Control: Areas Impacted by 2004 and 2005 Fires in Interior Alaska. A survey of Alaska BLM lands along the Dalton, Steese, and Taylor Highways BAER Final Report; Invasive Plant Monitoring Following 2004 Fires. USFWS National Wildlife Refuges – Alaska Region. Prepared for the U.S. Fish and Wildlife Service- Alaska Regional Office