To assess potential changes in tundra-nesting bird populations relative to increased herbivory by growing Lesser Snow Goose (Chen caerulescens caerulescens) and Ross's Goose (C. rossii) populations, we estimated avian population densities in coastal tundra near Cape Churchill, Manitoba, Canada in June 1984, 1999, and 2000. We also compared bird abundance in altered and intact freshwater sedge (Carex spp.) meadows to assess bird response at a smaller spatial scale, the habitat patch. At the landscape scale, Herring Gull (Larus argentatus) densities were significantly greater in both 1999 and 2000 than 1984, and Semipalmated Sandpiper (Calidris pusilla) and Savannah Sparrow (Passerculus sandwichensis) densities were greater in 2000 than 1984...
Effects of altered global climate and nitrogen cycles on an alpine watershed, Loch Vale, in Rocky Mountain National Park, CO; use of Path Analysis to elucidate trends in dynamic and hierarchical systems
Schmidt, T.S., A.R. Krcmarik, and J.S. Baron
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NABS 55th Annual Meeting: June 3-8, 2007 -- Columbia, South Carolina
Effects of Prescribed Burning in National Park Ecosystems
Major issues facing federal lands today involve environmental disturbances and land-use changes. To fully understand the ecological effects, Department of the Interior and Department of Agriculture (USDA) land management bureaus are engaged in long-term research and monitoring for which FORT is providing analytical support. One component of this task involves analyzing sediment and surface water chemistry samples in the cooperative USGS-USDA Forest Service Bioanalysis Laboratory for a Sequoia National Park study on the long-term effects of fire at the watershed ecosystem scale. A second component is to research methodologies for detecting change in source areas of dissolved organic carbon and nitrogen for boreal streams and lakes, as well as for arctic tundra ponds, in response to disturbance. This cooperative NPS-USGS research uses the information context provided by long-term NPS and USGS watershed ecosystem monitoring and inventory, and builds upon current ecosystem research at the study site. The third component provides routine laboratory analyses of surface water chemistry, soils, and plant tissue for about 40 sites within the National Forest System and National Park Service.