A5037496245- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Marine and coastal ecosystems
- Species Distribution and Climate Change
- Water Quality and Pollution Assessment
- Coastal wetland ecosystem dynamics
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Watershed Management Studies
- Land Use and Ecosystem Services
- Economic and Environmental Valuation
- Research Data Management Practices
- Ecology and Vegetation Dynamics Studies
- Data Analysis with R
- Microbial Community Ecology and Physiology
- Fire effects on ecosystems
- Isotope Analysis in Ecology
- Hydrology and Sediment Transport Processes
- Ecology and biodiversity studies
- Geology and Paleoclimatology Research
- Plant Ecology and Soil Science
- Peatlands and Wetlands Ecology
- Neuroscience, Education and Cognitive Function
- Soil erosion and sediment transport
- Smart Materials for Construction
University of Minnesota, Duluth
2016-2025
Iowa State University
2012-2020
Kansas State University
2020
Mokpo National University
2020
Minnesota Sea Grant
2016-2020
Schneider Electric (France)
2017
Rensselaer Polytechnic Institute
2016
Zhejiang Ocean University
2016
Zhejiang University
2016
University of Hyogo
2016
Abstract Global concern about human impact on biological diversity has triggered an intense research agenda drivers and consequences of biodiversity change in parallel with international policy seeking to conserve associated ecosystem functions. Quantifying the trends is far from trivial, however, as recently documented by meta‐analyses, which report little if any net local species richness through time. Here, we summarise several limitations a metric show that expectation directional under...
Nitrogen (N) and phosphorus (P) commonly co-limit primary productivity in lakes, chlorophyll a (Chl-a) is predicted to be greatest under high N, P regimes. Because land use practices can alter N biogeochemical cycles watersheds, it unclear whether previously documented phytoplankton–nutrient relationships apply where landscapes are highly disturbed. Here, we analyzed lake water quality database from an agricultural region explore among Chl-a, total (TN), (TP) extreme nutrient concentrations....
Abstract Freshwater biodiversity loss potentially disrupts ecosystem services related to water quality and may negatively impact functioning temporal community turnover. We analysed a data set containing phytoplankton zooplankton from 131 lakes through 9 years in an agricultural region test predictions that plankton communities with low are less efficient their use of limiting resources display greater turnover (measured as dissimilarity). Phytoplankton resource efficiency ( RUE = biomass...
Abstract Understanding the factors that affect water quality and ecological services provided by freshwater ecosystems is an urgent global environmental issue. Predicting how will respond to changes not only requires data, but also information about context of individual bodies across broad spatial extents. Because lake usually sampled in limited geographic regions, often for time periods, assessing controls compilation many data sets regions into integrated database. LAGOS-NE accomplishes...
The relationship between chlorophyll a (Chl ) and total phosphorus (TP) is fundamental in lakes that reflects multiple aspects of ecosystem function also used the regulation management inland waters. exact form this has substantial implications on its meaning use. We assembled spatially extensive data set to examine whether nonlinear models are better fit for Chl —TP relationships than traditional log‐linear models, there were regional differences relationships, and, if so, which factors...
Agricultural soil loss and deposition in aquatic ecosystems is a problem that impairs water quality worldwide costly to agriculture food supplies. In the US, for example, billions of dollars have subsidized conservation practices agricultural landscapes over past decades. We used paleolimnological methods reconstruct trends sedimentation related human-induced landscape change 32 lakes intensively region Midwestern United States. Despite erosion control efforts, we found accelerating...
Quantifying the relationship between phytoplankton and zooplankton may offer insight into sensitivity to shifting assemblages potential impacts of producer-consumer decoupling on rest food web. We analyzed 18 years (2001-2018) paired samples collected as part United States Environmental Protection Agency (U.S. EPA) Great Lakes Biology Monitoring Program examine both long-term seasonal relationships across all five Laurentian Lakes. also effects diversity biomass, diversity, predator-prey...
Wildfires can disrupt carbon transport from land to water, but how lake cycling responds fires remains unclear. Here, we analyzed the concentration and dominance of main forms in total pools 54 lakes (34 burned, 20 control) across 3 regions Quebec, Canada Minnesota, USA recent wildfires ( < 1 – years). Lakes burned watersheds had up double dissolved organic concentrations control lakes, fire effect was most apparent when accounting for climate landscape drivers (e.g., catchment area ratio)...
Nutrient and light availability, their balance, can modify community composition structure in pelagic communities. Previous studies have demonstrated contradictory findings about whether total phosphorus (TP) concentrations alone or the ratio of nitrogen (TN) to TP (TN:TP) drive Cyanobacteria dominance freshwater ecosystems, influences availability are often overlooked. Here, we analyzed a 12 year, 137 lake database test paradigms phytoplankton compositional patterns across nutrient (TN, TP,...
The ratio of zooplankton to phytoplankton (Z:P) standing stock biomass in freshwater lakes has been suggested decline highly productive systems. An increasingly large proportion inedible phytoplankton, especially eutrophic systems dominated by Cyanobacteria, is one possible mechanism for declining Z:P. We tested this hypothesis calculating the and samples collected from 173 culturally estimating change functional relationship between after ignoring Cyanobacteria. found up 2 orders magnitude...
Lake Superior has a vast and largely undeveloped watershed in comparison to the other Great Lakes, which makes it challenging study mercury (Hg) sources cycling. To examine Hg inputs Superior, we conducted an expansive binational assessment 40 watersheds from diverse range of landcover types. We further paired tributary data sediment source portfolios nearshore offshore zones through partnership with Lakes Sediment Surveillance Program. observed that total loads were highest spring driven by...
Abstract Understanding the broad‐scale response of lake CO 2 dynamics to global change is challenging because relative importance different controls surface water not known across broad geographic extents. Using geostatistical analyses 1080 lakes in conterminous United States, we found that partial pressure ( p ) was controlled by chemical and biological factors related inputs losses along climate, topography, geomorphology, land use gradients. Despite weak spatial patterns study extent,...
Abstract Despite increasing wildfires, few studies have investigated seasonal water quality responses to wildfire characteristics (e.g., burn severity) across a large number of lakes. We monitored 30 total lakes (15 burned, 15 control) monthly following the Greenwood Fire in Minnesota, USA, lake‐rich region with historically prevalent wildfire. found increases median concentrations nitrogen (68%), phosphorus (70%), dissolved organic carbon (127%), suspended solids (71%), and reduced clarity...
Abstract Understanding broad‐scale ecological patterns and processes often involves accounting for regional‐scale heterogeneity. A common way to do so is include regions in sampling schemes empirical models. However, most existing were developed specific purposes, using a limited set of geospatial features irreproducible methods. Our study purpose was to: (1) describe method that takes advantage recent computational advances increased availability regional global data sets create...
Abstract Nitrogen (N) and phosphorus (P) commonly stimulate phytoplankton production in lakes, but recent observations from lakes an agricultural region suggest that nitrate may have a subsidy‐stress effect on chlorophyll (Chl ). It is unclear, however, how generalizable this might be. Here, we analyzed large water quality dataset of 2385 spanning 60 regions across 17 states the Northeastern Midwestern U.S. to determine if N effects are common identify regional landscape characteristics...
Evidence suggests that lakes are important sites for atmospheric CO2 exchange and so play a substantial role in the global carbon budget. Previous research has 2 weaknesses: (1) most data have been collected only during open-water or summer seasons, (2) concentrated principally on natural northern latitudes. Here, we report full annual cycle of exchanges 15 oligotrophic to eutrophic reservoirs Glacial Till Plains United States. With one exception, these showed an overall loss year, with...