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Decision making, mitigation, and remediation of sedimentation within large wetland systems: a case study using Agassiz National Wildlife Refuge

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Determining the sedimentation rate in the marshes of Sand Lake National Wildlife Refuge

Impoundments located within river systems in the Northern Great Plains are vulnerable to sediment inputs because intensive agriculture in watersheds has increased soil erosion and sediments in rivers. At the request of the U.S. Fish and Wildlife Service, the vertical accretion of sediment was evaluated in the Mud Lake impoundment of Sand Lake National Wildlife Refuge, Brown County, South Dakota. The Mud Lake impoundment was created in 1936 by constructing a low-head dam across the James River. Sediment cores were collected from the Mud Lake impoundment during August 2000 for determination of vertical accretion rates. Accretion rates were estimated using cesium-137 and lead-210 isotopic dating techniques to estimate...

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Climate Change

Changes in weather and climate driven by rising global temperatures are impacting ecosystems around the world. In the northern Great Plains, warming temperatures in combination with altered frequency and severity of wet and dry periods are influencing the regions terrestrial and aquatic ecosystems in new and potentially unique ways. Given the valued services these ecosystems provide to society, NPWRC researchers have initiated efforts to better understand the ultimate effects of climate driven changes on the functioning of natural systems. As changes related to climate change become increasingly pronounced in the coming decades, stresses placed on the terrestrial and aquatic ecosystems of the northern Great Plains...

Predicting bird and bat fatality risk at wind farms and proposed wind farm sites using acoustic-ultrasonic recorders

The USGS and University of Minnesota collaborators used acoustical and ultrasonic recorders to monitor flight notes of birds and calls emitted by bats flying at low elevations. Recorders were deployed in conjunction with ongoing fatality searches at wind facilities and at sites with a variety of landscape features. Objectives are to determine whether the recorders can be used to compare low-elevation flight activity among sites, and to relate recorder results to numbers of dead birds and bats found at wind facilities. The U.S. Fish and Wildlife Service joined the partnership to deploy the recorders at numerous locations along the shores of several Great Lakes to estimate low-elevation flight activity of birds and...

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Map of Whooping Crane stopover site use intensity within the Great Plains from satellite telemetered birds, 2010-2014

Whooping cranes (Grus americana) of the Aransas-Wood Buffalo population migrate twice each year through the Great Plains in North America. Recovery activities for this endangered species include providing adequate places to stop and rest during migration, which are generally referred to as stopover sites. To assist in recovery efforts, initial estimates of stopover site use intensity are presented, which provide opportunity to identify areas across the migration range used more intensively by whooping cranes. We used location data acquired from 58 unique individuals fitted with platform transmitting terminals that collected global position system locations. Radio-tagged birds provided 2,158 stopover sites over 10...

Categories: Data, Publication; Types: Citation, Downloadable, GeoTIFF, Map Service, Raster; Tags: North America, biota, birds, endangered species, migratory birds, All tags... migratory species, special status species, wading birds, Fewer tags

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