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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...
This report describes the work performed by the Alaska Exotic Plant Management Team at Wrangell-St. Elias National Park and Preserve during the 2010 season. Six Alaska Exotic Plant Management Team staff members were stationed at Park Headquarters in Copper Center while working at various locations within the park and preserve. Invasive plant inventories and treatments occurred around the following locations: along the McCarthy and Nabesna roads, along the Copper, Chitina, and Nizina rivers, at other locations in the Copper Basin, and at several backcountry destinations within park lands. Invasive plant infestations were mapped using Trimble GeoXT units and manual weeding was performed with the help of volunteers,...
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Quantifying an invasive species' negative impacts across its introduced range will be quite challenging if the impacts vary unpredictably from site to site or from population to population. Little emphasis, however, has been placed on quantifying such interpopulation variation in the impacts of individual invasive species. We studied the response of a native grass (Festuca rubra) to competition from 4 geographically dispersed invasive plant (Melilotus albus) populations in order to determine if some populations of this invader have greater competitive impacts than others. Despite the relatively large number of experimental units in our greenhouse study, we did not obtain evidence that competitive effects per gram...
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Intended for timely release of basic data sets and data summaries. An example would be simple, annual reporting of monitoring results. Care has been taken to assure accuracy of raw data values, but a thorough analysis and interpretation of the data has not been completed. Consequently, the initial analyses of data in these reports are provisional and subject to change.
This report describes the work performed by the Alaska Exotic Plant Management Team at Denali National Park & Preserve during the 2010 field season. The Exotic Plant Management Team staff at Denali National Park & Preserve was comprised of two American Recovery and Reinvestment Act funded Student Conservation Association interns and one seasonal National Park Service employee. For the seventh consecutive year, invasive plant inventory and control occurred within the park focusing on the entrance area including the Denali Park Road, Visitor Center, railroad station, and campground. Invasive plant infestations were mapped using a Trimble 2003 GeoXT and manual weeding was performed with the help of three Southeast...
Melilotus albus (white sweetclover) has invaded Alaskan glacial river floodplains. We measured cover and density of plant species and environmental variables along transects perpendicular to the Nenana, Matanuska, and Stikine Rivers to study interactions between M. albus and other plant species and to characterize the environment where it establishes. Melilotus albus was a pioneer species on recently disturbed sites and did not persist into closed canopy forests. The relationships between M. albus cover and density and other species were site-specific. Melilotus albus was negatively correlated with native species Elaeagnus commutata at the Nenana River, but not at the Matanuska River. Melilotus albus was positively...
map background search result map search result map Pike pests ravage Alaska's salmon Invasive pike establishment in Cook Inlet Basin lakes, Alaska: diet, native fish abundance and lake environment Combining barcoding and traditional taxonomy to study the diversity of microgastrinae wasps (Hymenoptera: Braconidae) in Arctic North America Do Populations of an Invasive Weed Differ Greatly in their Per-Gram Competitive Effects? Invasive and exotic species management in Denali National Park and Preserve: 2012 Summary report.  Invasive and exotic species management in Denali National Park and Preserve: 2012 Summary report.  Do Populations of an Invasive Weed Differ Greatly in their Per-Gram Competitive Effects? Pike pests ravage Alaska's salmon Invasive pike establishment in Cook Inlet Basin lakes, Alaska: diet, native fish abundance and lake environment Combining barcoding and traditional taxonomy to study the diversity of microgastrinae wasps (Hymenoptera: Braconidae) in Arctic North America