A5037483221- Fish Ecology and Management Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Soil and Water Nutrient Dynamics
- Ecology and biodiversity studies
- Water Quality and Pollution Assessment
- Pharmaceutical and Antibiotic Environmental Impacts
- Aquatic Invertebrate Ecology and Behavior
- Freshwater macroinvertebrate diversity and ecology
- Environmental Toxicology and Ecotoxicology
- Reproductive biology and impacts on aquatic species
- Botany and Plant Ecology Studies
- Heavy metals in environment
- Environmental Changes in China
- Toxic Organic Pollutants Impact
- Land Use and Ecosystem Services
- Geochemistry and Elemental Analysis
- Hydrology and Watershed Management Studies
- Coastal wetland ecosystem dynamics
- Diatoms and Algae Research
- Avian ecology and behavior
- Wildlife Ecology and Conservation
- Aquaculture Nutrition and Growth
- Species Distribution and Climate Change
- Effects and risks of endocrine disrupting chemicals
University of Calgary
2013-2024
Saint Joseph's Hospital
2021
University of Wisconsin–Madison
1995-2001
Duke University
2001
McGill University
1993-1994
University of British Columbia
1988
Milwaukee County Medical Complex
1975
Medical College of Wisconsin
1975
Abstract About 5–10% of the world's land surface is currently wetland but possibly >70% already destroyed or impaired. Conservation these unique ecosystems lags progress in other realms, reflected high rates biodiversity loss. Wetlands provide a range critically important ecosystem services including fresh water, nutrient cycling, food and fibre production, carbon fixation storage, flood mitigation water storage; treatment purification habitats for biodiversity. There increasing...
Abstract As the United Nations develops a post-2020 global biodiversity framework for Convention on Biological Diversity, attention is focusing how new goals and targets ecosystem conservation might serve its vision of ‘living in harmony with nature’ 1,2 . Advancing dual imperatives to conserve sustain services requires reliable resilient generalizations predictions about responses environmental change management 3 Ecosystems vary their biota 4 , service provision 5 relative exposure risks 6...
Relationships between littoral habitat complexity and invertebrate distributions in fishless lakes are not well understood compared with well-documented relationships fish. We examined over fine-scale gradients of weed-bed contrasted these patterns four shallow prairie two fish without. The above-sediment portion submerged macrophytes associated invertebrates was sampled from three microhabitats: centres (highly complex), edges (moderately single plants that grew apart distinct weed beds...
odeling has become an important tool in the study of ecological systems,as a scan table con tents ny major eco l ogical journ makes abundantly clear. A number books have recently been published that provide excellent advice on mo del construction, building, and use (e.g.,Gotelli 1995, Gurney Nisbet 1998, Roughgarden 1998) add to classic literature deling systems their dynamics (e.g., Maynard Smith 1974, 1 9 8 2 ) . Un fortu n tely, h owever, i t e — f s growing cological modeling addresses...
Summary 1. Winter temperatures differ markedly on the Canadian prairies compared with Denmark. Between 1 January 1998 and 31 December 2002, average weekly monthly did not drop below 0 °C in vicinity of Silkeborg, Over this same time, near Calgary, Alberta, Canada, often dropped −10 for 3–5 weeks temperature was 2–4 months. Accordingly, winter ice conditions shallow lakes Canada Denmark differed considerably. 2. To assess implications climate lake biotic structure function we a number...
The diatom Didymosphenia geminata (Bacillariophyceae) has garnered increased attention as a nuisance and invasive species in freshwater systems. Historically described rare yet cosmopolitan, suspected new variant of D. the capacity to inundate kilometres river bottom during bloom. Unlike most other bloom-forming algae, proliferates under high water quality (i.e., low turbidity nutrient) conditions. To inform management strategies, environmental factors conditions that promote bloom events...
Environmental contaminants from wastewater and industrial or agricultural areas are known to have adverse effects on development, reproduction, metabolism. However, reliable assessment of environmental contaminant impact at low (i.e., ambient) concentrations using genomics transcriptomics approaches has proven challenging. A goldfish model was used investigate the aquatic pollutant exposure in vivo by means quantitative nuclear magnetic resonance metabolomics multiple organs elucidate a...
We have evaluated the role of sediment pH (4.7–7.1) and redox potential (88–305 mV) in determining bioavailability five metals to four species isoetoid macrophytes. The (Eleocharis acicularis, Eriocaulon septangulare With., Isoetes sp., Sagittaria graminae) did not differ significantly relationship between contents plants sediment. When data for all were pooled, 28–80% variation log plant metal content was explained by (Al, Fe, Mn) or organic (Cu Zn). Sediment 45% (Al), 10% (Cu), 20% (Fe),...
Abstract In the current study, 28 organic contaminants were measured, many with estrogen‐like activity, in water collected from 16 sites on two rivers South Saskatchewan River Basin, Alberta, Canada. The compounds detected included synthetic estrogens (birth control pill and hormone therapy drugs) downstream of municipal wastewater effluents natural hormones agricultural areas. Greater concentrations cholesterol derivatives, phytosterols, fecal sterols measured at most sites, which indicates...
Summary 1. The diatom Didymosphenia geminata has emerged in recent years as a globally invasive species. Although considered native to North America, reports of nuisance blooms have increased over the last decade. 2. Previously, we determined that D. was ubiquitous two major headwaters South Saskatchewan River Basin (SSRB), Alberta, Canada, but found it only bloomed at certain sites, including those immediately downstream from dam outfalls. To evaluate role dams abundance and blooming ,...
We examined data from 1984 to 1994 for five species of Lake Michigan salmonids explore the relationship between total PCB concentration and percent lipid. When we compared mean lipid values, found a strong linear correlation. values among individuals, modest positive PCB:lipid associations in brown trout (Salmo trutta), chinook salmon (Oncorhynchus tshawytscha), coho kisutch), rainbow mykiss) collected during spawning, but were not apparent nonspawning individuals. (Salvelinus namaycush)...
Do changes in the species composition of riverine fish assemblages along river networks lead to predictable food‐web structure? We assembled empirical “fish‐centered” food webs for three rivers located a latitudinal gradient South Saskatchewan River Basin (SSRB) that differ land‐use impacts and geomorphology but flow through similar mountain, foothill, prairie physiographic regions. then calculated 17 properties determine whether nine differed according region or sub‐basin. There were no...
Coherent timing of agricultural expansion, fertilizer application, atmospheric nutrient deposition, and accelerated global warming is expected to promote synchronous fertilization regional surface waters coherent development algal blooms lake eutrophication. While broad-scale cyanobacterial expansion evident in meta-analyses, little known whether lakes discrete catchments within a common district also exhibit water quality degradation through anthropogenic forcing. Consequently, the primary...
To assess how features of lakes and their watersheds influence winter oxygen decay rates the frequency anoxia in shallow prairie lakes, we measured lake watershed characteristics for 21 south‐central Alberta related these to during 1998–2000. Oxygen were functions macrophyte biomass, percentage littoral area, total phosphorus ranged from 0.006 0.216 mg O 2 m −3 d −1 . ~4 times higher polymictic compared deep, stratified lakes. Within those classified as turbid had ~1.5 than clear....
To test the hypothesis that elements can be transferred from freshwater sediments to macrophytes and epiphytes, we grew Myriophyllum spicatum in natural containing 60 Co 54 Mn (essential) 137 Cs, 152 Eu, 154 155 Eu (nonessential). We found no differences between shoot or epiphyte sediment bioaccumulation factors (BAFs) only root BAFs for Mn, probably because these adsorb onto surfaces. any shoots suggesting transfer of essential nonessential elements. There were, however, interelement roots,...
Environmental compounds with estrogen- or antiestrogen-like activity can enter rivers from multiple sources, including municipal wastewater and agricultural runoff. We used longnose dace (Rhinichthys cataractae) to investigate exposure estrogen-like activity, which we measured in water at sites the Oldman Bow (AB, Canada). evaluated changes vitellogenin mRNA quantitative reverse transcription-polymerase chain reaction, then compared levels sex ratios fish performance indices assess how...
Carassius gibelio (Prussian carp) is considered native from central Europe to Siberia and invasive in Asia, Europe, the Middle East. Todate, there have been no published occurrences of C. open waters North America. Although are reports late 1800’s that was imported into USA, some doubt exists regarding identity those fish it unknown whether any were released wild. Here we report first confirmed records wild America estimate its current distribution by compiling private public sources....
SUMMARY Sediments and eleven species of rooted submerged aquatic macrophytes were sampled from twenty‐five lakes in southern Quebec to examine patterns metal content. Linear regression models relating the content metals their sediments demonstrated that isoetoid ( Eleocharis acicitlaris, Eriacaulon septangulare, Isoetes sp . Sagittaria graminae ) non‐isoetoid had different plant‐sediment relationships. Canopy‐forming Myriophyllum spicatum, Potamogeton amplifalius, P. crispus perfoliatus...
Dietary exposure is the principal source of polychlorinated biphenlys (PCBs) to Great Lakes salmonids. PCB transfer efficiency has typically been determined with laboratory studies using high food concentrations and clean animals, making extrapolations field uncertain. Here, we present estimates net efficiencies for Lake Michigan coho salmon, chinook lake trout based on 15 years in these fish their prey. Between 1975 1990, large changes Michigan's pelagic web led salmon diets growth...
Journal Article Fisheries Management to Reduce Contaminant Consumption: Selective stocking can decrease PCB levels in the Lake Michigan fish consumed by people Get access Craig A. Stow, Stow Search for other works this author on: Oxford Academic Google Scholar Stephen R. Carpenter, Carpenter Charles P. Madenjian, Madenjian Lisa Eby, Eby Leland J. Jackson BioScience, Volume 45, Issue 11, December 1995, Pages 752–758, https://doi.org/10.2307/1312627 Published: 01 1995