Folders: ROOT > ScienceBase Catalog > Upper Midwest Environmental Sciences Center (UMESC) > Upper Midwest Environmental Sciences Center Data > Laurentian Great Lakes ( Show all descendants )
11 results (46ms)
Location
Folder
ROOT _ScienceBase Catalog __Upper Midwest Environmental Sciences Center (UMESC) ___Upper Midwest Environmental Sciences Center Data ____Laurentian Great Lakes Filters
Date Range
Contacts
Categories Tag Types Tag Schemes |
Between 1900 and 1932, a copper (Cu) mine operated near Gay, Michigan, along the shore of Lake Superior, discharged approximately 22.8 million metric tons of waste material known as ‘stamp sands’ (SS) to a nearby beach. This pile of SS has migrated via wind and rain along the beaches in northern Grand Traverse Bay and into Buffalo Reef, an important spawning area for Lake Trout and Lake Whitefish. During their first summer, these newly spawned fish consume benthic invertebrates and zooplankton in nearby beach habitats. SS contain elevated concentrations of metals (especially Cu) that are toxic to many invertebrate taxa, and studies have observed very few benthic taxa in areas with very high SS. Here, we sampled...
Categories: Data;
Tags: Aquatic Biology,
Keweenaw Bay NE,
Lake Superior,
Michigan,
Southcentral Lake Superior,
The Upper Midwest Environmental Sciences Center (UMESC) in La Crosse, Wisconsin is studying the distribution and foraging patterns of sentinel fish-eating waterbirds through aerial surveys, and by tracking migration movements coupled with foraging depth profiles of common loons equipped with archival geo-locator tags and satellite transmitters. The results of this work are expected to elucidate where piscivorous waterbirds are likely to be exposed to forage fish carrying type-E botulinum toxin, which in turn will inform site-specific efforts to assess the degree to which physical and ecological factors contribute to the occurrence of botulinum toxin in aquatic food webs. Additional resources associated with UMESC's...
Microcystins (MC) are a class of cyanotoxins produced by many cyanobacteria taxa. Although toxic to metazoans, the evolution of microcystin pre-dates the appearance of metazoans, and so MC did not originate as a toxin to potential metazoan grazers. One hypothesized functional role of microcystin is the management and acquisition of metals, several of which form complexes with MC intracellularly. Metals are often used to build enzymes within the cell that allow cyanobacteria to use non-preferred nitrogen (N) and phosphorus (P) sources, such as nitrate, urea and organic P. If trace metals are in low supply, primary producers may become limited because of their inability to access these non-preferred N and P forms....
Categories: Data;
Tags: Aquatic Biology,
Great Lakes,
Green Bay,
Northwestern Lake Michigan,
USGS Science Data Catalog (SDC),
Rivermouth ecosystems, or freshwater estuaries, are the focus of human and wildlife interactions with the Great Lakes. They are highly valued as the region’s urban, industrial, shipping and recreational centers; and home to recreational harbors, wildlife viewing and production, beaches and urban riverfronts. Rivermouths are also both the mixing zones where nutrients from upstream watersheds are incorporated into the Great Lakes ecosystem and important sites for fish nursery and passage to upstream spawning grounds. These estuarine processes have been broadly altered through watershed land use, floodplain development, harbor channel dredging, wetland filling, urban stormwater, shoreline hardening, road and bridge...
Lake Superior is historically a nutrient poor lake that does not typically support significant cyanobacterial blooms. However, the lake has been experiencing an increase in blooms in the western portion of the basin recently. The largest blooms documented have occurred after recent major flooding events, indicating that nutrients transported to the lake during these events may be a source for the blooms. This study looks into the combination of streambed sediment-derived nutrient data during base flow conditions and suspended and settled sediment-derived nutrient data from storm events to provide information about nutrient transformation and storage in the river networks of the Bois Brule River and Siskiwit River...
Categories: Data;
Tags: Aquatic Biology,
USGS Science Data Catalog (SDC),
Upper Wisconsin,
Water Quality,
Western Lake Superior,
Nutrient reduction on the landscape scale often focuses on actions that reduce the movement of nitrogen (N) and phosphorus (P) from agricultural lands into streams and rivers. However, processing of N and P in streams and rivers can be substantial and increasing these in-stream processing rates could result in reductions or transformations of nutrients to less labile or less mobile forms. We hypothesize that buffer conditions could influence the microbial community and sediment characteristics of streams and rivers and thereby influence in-stream N and P processing rates. As a result, we predict that variation in buffer land cover (from agricultural to wetlands to forest) causes differences in processing rates....
Metals are used in primary producer metabolic pathways, such as photosynthesis and the acquisition of macronutrients nitrogen (N) and phosphorus (P), yet we often do not know their potential as limiting nutrients in freshwaters. In the Great Lakes, metals have sometimes been identified as limiting the acquisition of macronutrients, mostly in off-shore waters that are relatively isolated from tributary inputs and sediment interactions. We hypothesized that another area where metals might be important was within harmful algal blooms (HABs). Harmful algal blooms are more likely to occur where N and P loads are elevated due to human activities, but short-term growth assays still often find summer bloom communities are...
USGS scientists use tree swallows and colonial waterbirds in the Great Lakes watershed to evaluate contaminant Exposure (geographic and spatial); Trends through time(temporal) Effects (reproductive, physiological, genetic) Monitor cleanup actions Objectives 1 and 2 - Exposure data concentrate on several classes of new and emerging contaminants, such as the now ubiquitous flame retardants (polybrominated diphenyl ethers [PBDCs]) and stain repellents (perfluorinated compounds [PFCs]). These data are important in understanding the distribution of these relatively-little studied chemicals in birds. UMESC scientists gather data on several well-studied chemical classes (PCBs, mercury, dioxins) as well because these...
|
|
