A5073890389- Fire effects on ecosystems
- Rangeland and Wildlife Management
- Ecology and Vegetation Dynamics Studies
- Avian ecology and behavior
- Species Distribution and Climate Change
- Wildlife Ecology and Conservation
- Computational Drug Discovery Methods
- Fish Ecology and Management Studies
- Environmental Toxicology and Ecotoxicology
- Soil and Water Nutrient Dynamics
- Hydrology and Sediment Transport Processes
- Forest ecology and management
- Forest Management and Policy
- Peatlands and Wetlands Ecology
- Animal Ecology and Behavior Studies
- Hydrology and Watershed Management Studies
- Botany, Ecology, and Taxonomy Studies
- Free Radicals and Antioxidants
- Water Quality and Resources Studies
- Graph theory and applications
- Coastal wetland ecosystem dynamics
- Botany and Plant Ecology Studies
- Bioenergy crop production and management
- Toxic Organic Pollutants Impact
- Wildlife-Road Interactions and Conservation
University of Minnesota, Duluth
2016-2025
Minnesota Department of Natural Resources
1996-2018
University of Minnesota
1990-2017
University of Oulu
1997
University of Missouri–St. Louis
1991
Environmental Protection Agency
1987-1989
Florida State University
1984
▪ Abstract Ecological indicators have widespread appeal to scientists, environmental managers, and the general public. Indicators long been used detect changes in nature, but scientific maturation indicator development primarily has occurred past 40 years. Currently, are mainly assess condition of environment, as early-warning signals ecological problems, barometers for trends resources. Use requires clearly stated objectives; recognition spatial tempor al scales; assessments statistical...
Our results suggest that the limits of breeding range wood thrush and its relative abundance within are not highly related to presence ecologically similar species. These parameters better accounted for by variables such as species-specific nesting foraging requirements, which in turn covary with vegetation structure eastern deciduous forest. Studies single-species geographical ecology should precede studies assemblages. The Grinnellian model is more likely than Hutchinsonian provide sound...
Since European settlement, over 50 % of coastal wetlands have been lost in the Laurentian Great Lakes basin, causing growing concern and increased monitoring by government agencies. For a decade, efforts focused on development regional organism-specific measures. To facilitate collaboration information sharing between public, private, agencies throughout we developed standardized methods indicators used for assessing wetland condition. Using an ecosystem approach stratified random site...
We assessed avian nesting success in two forested landscapes (Chippewa and Superior National Forests) northern Minnesota. found 311 nests of 33 species the Chippewa study area 36 13 area. Each nest was classified into one three general habitat types: open (clearcuts with vegetation <2 m high), regenerating aspen (2-8 or (trees >8 high). Mayfield for most common (all which had open-cup nests) averaged 0.43. Nesting ranged from 0.18 Red-eyed Vireo (Vireo olivaceus) to 0.76 Yellow Warbler...
We examined the habitat distributions of management indicator and sensitive species (MIS), as defined by U.S. Forest Service within Chequamegon National (CNF) northern Wisconsin whether other bird were positively associated with these MIS. addressed associations 2 relatively large databases, annual breeding counts 92 line transect segments gathered from 1986 to 1992 122 Stands in 1992-1993. Of 25 MIS identified CNF, only 7 abundant enough for analyses. The either too rare CNF or censusing...
We conducted breeding bird surveys in Minnesota, Wisconsin, and South Dakota 12 hybrid poplar plantations surrounding landscapes from 1992 to 1994. Plantations varied age, shape, composition of landscape, internal vegetative heterogeneity. Numbers individuals species were lower than forest/shrub habitat, but higher row crops. observed within several groups based on migratory status habitat preference also differed among land‐use types. Most differences between numbers Year‐to‐year changes...
Niemi, G., J. Hanowski, P. Helle, R. Howe, M. Mönkkönen, L. Venier and D. Welsh 1998. Ecological Sustainability of Birds in Boreal Forests. Conservation Ecology 2(2):17. https://doi.org/10.5751/ES-00079-020217
Abstract An in vivo fish model was used to monitor the respiratory-cardiovascular responses of individual spinally transected rainbow trout exposed acutely toxic aqueous concentrations two acetylcholinesterase (AChE) inhibitors, malathion and carbaryl, mucous membrane irritants, acrolein benzaldehyde. The most striking changes physiology noted on carbaryl exposures were immediate decreases oxygen utilization (U) heart rate (HR). Ventilation volume (VG) increased compensate for lower U, but...
Abstract An in vivo fish model was adapted to monitor respiratory‐cardiovascular responses of spinally transected rainbow trout exposed acutely toxic aqueous concentrations two uncouplers oxidative phosphorylation, pentachlorophenol (PCP) and 2,4‐dinitrophenol (DNP), narcotics, tricaine methanesulfonate (MS‐222) 1‐octanol. The most evident response the a rapid 150 200% increase ventilation volume (V G ) oxygen consumption (VO 2 over entire survival period. This caused an initial total...
Submergent aquatic vegetation (SAV) is a powerful indicator of environmental conditions in both marine and fresh water ecosystems. Quickbird imagery was used to map SAV at three sites across the Great Lakes. Unsupervised classifications were performed each site using summer sensor data. At one site, multi‐temporal classification approach added, combining visible red difference (May–August) with August green band Multi‐temporal superior single‐date results this site. Muck bottom not seriously...
Abstract The physiological responses of rainbow trout to acutely lethal aqueous concentrations the suspected polar narcotics phenol, 2,4‐dimethylphenol, aniline, 2‐chloroaniline and 4‐chloroaniline were examined. Visible signs intoxication included tremors that progressed whole‐organism clonic seizures, followed by general depression respiratory‐cardiovascular collapse. Tremors seizures usually initiated with coughs. most striking changes in parameters for all five toxicants elevated cough...