A5000719134- Aquatic Ecosystems and Phytoplankton Dynamics
- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Marine and coastal ecosystems
- Water Quality and Pollution Assessment
- Hydrology and Watershed Management Studies
- Water Quality and Resources Studies
- Species Distribution and Climate Change
- Aquatic Invertebrate Ecology and Behavior
- Environmental Toxicology and Ecotoxicology
- Freshwater macroinvertebrate diversity and ecology
- Groundwater and Isotope Geochemistry
- Groundwater flow and contamination studies
- Peatlands and Wetlands Ecology
- Geology and Paleoclimatology Research
- Flood Risk Assessment and Management
- Atmospheric and Environmental Gas Dynamics
- Aquatic Ecosystems and Biodiversity
- Hydrology and Drought Analysis
- Isotope Analysis in Ecology
- Research Data Management Practices
- Ecosystem dynamics and resilience
- Ocean Acidification Effects and Responses
- Coastal wetland ecosystem dynamics
- Ecology and biodiversity studies
Michigan State University
2013-2025
University of Wisconsin–Madison
1996-2023
Michigan Department of Natural Resources
2013-2022
Trinity College Dublin
2013-2017
Queen's University Belfast
2010-2011
University of Maine
2004-2008
Plymouth State University
2007
Oregon State University
2007
University of New Hampshire at Manchester
2004
Wisconsin Department of Natural Resources
1986-2000
The region studied includes the Laurentian Great Lakes and a diversity of smaller glacial lakes, streams wetlands south permanent permafrost towards southern extent Wisconsin glaciation. We emphasize lakes quantitative implications. is warmer wetter than it has been over most last 12000 years. Since 1911 observed air temperatures have increased by about 0·11°C per decade in spring 0·06°C winter; annual precipitation 2·1% decade. Ice thaw phenologies since 1850s indicate late winter warming...
1. Using data from the North Temperate Lakes Long‐Term Ecological Research site in northern Wisconsin, we present a series of examples illustrating how landscape setting can influence static and dynamic aspects many physical, chemical biological properties lakes. 2. One important attribute is hydrologic position lake within regional flow regime. Lake determines relative importance groundwater precipitation input to lake, with lakes high receiving greater proportion their waters than lower...
Climatic shifts to drier conditions during drought alter the hydrologic pathways of water and solute flow aquatic ecosystems. We examined differences in drought‐induced trends semiconservative cations, Ca+Mg, seven northern Wisconsin lakes. These spanned range settings region, including hydraulically mounded, groundwater flowthrough, groundwater‐discharge Parallel increases concentration across lakes were attributable evapoconcentration. However, we observed divergent for mass, which better...
Laboratory experiments with Daphnia pulex, Simocephalus vetulus, ambigua, Ceriodaphnia quadrangula, and Bosmina longirostris showed that large algal filaments have a differential effect on zooplankton of different size. As filament concentration increased, larger animals filtered at low rates, increased their rejection decreased brood sizes. In nature, this greater sensitivity could contribute to an increase in the proportion smaller during blooms filamentous algae.
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...
Governmental entities are responsible for managing and conserving large numbers of lake, river, wetland ecosystems that can be addressed only rarely on a case-by-case basis. We present system predictive classification modeling, grounded in the theoretical foundation landscape limnology, creates tractable number ecosystem classes to which management actions may tailored. demonstrate our by applying two types modeling approaches develop nutrient criteria eutrophication 1998 north temperate...
Catchment land uses, particularly agriculture and urban have long been recognized as major drivers of nutrient concentrations in surface waters. However, few simple models developed that relate the amount catchment use to downstream freshwater nutrients. Nor are existing applicable large numbers freshwaters across broad spatial extents such regions or continents. This research aims increase model performance by exploring three factors affect relationship between nutrients freshwater: extent...
Abstract Growth of macroscale limnological research has been accompanied by an increase in secondary datasets compiled from multiple sources. We examined patterns data availability LAGOS‐NE, a dataset derived 87 sources, to identify biases lake water quality and consider how such might affect perceived at subcontinental scale. Of eight common parameters, variables indicative trophic state (Secchi, chlorophyll, total P) were most abundant terms observations, lakes sampled, long‐term records,...
1. We tested the degree to which a lake's landscape position constrains expression of limnological features and imposes characteristic spatial pattern in glacial lake district, Northern Highland Lake District north‐central Wisconsin. 2. defined order as metric analyze effect on features. order, analogous stream is based solely geographical information simple measure. 3. examined strength relationship between set 25 variables, included measures morphometry, water optical properties, major...
1. Within a lake district of relatively homogeneous geomorphology, the responses lakes to climate are influenced by complexity hydrogeologic setting, position in landscape, and lake‐specific biological physical features. We examined chemical drought surface water‐ groundwater‐dominated districts address two general questions. (1) Are spatial patterns dynamics among uniform synchronous within district, suggesting broad geomorphic controls; variable spatially explicit pattern, with synchrony...
Two hundred and seventy-five lakes were sampled in the summer of 1979 to assess factors controlling susceptibility northcentral Wisconsin acidification. In addition direct evaluation means ranges physical chemical characteristics, a cluster analysis was carried out using alkalinity, color, chlorophyll data. Three well-defined clusters emerged that appeared be controlled by hydrology: A — dominated surface runoff; B groundwater; C precipitation. Relationships between morphometric, hydrologic,...
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...
We compiled a lake-water clarity database using publically available, citizen volunteer observations made between 1938 and 2012 across eight states in the Upper Midwest, USA. Our objectives were to determine (1) whether temporal trends existed this large geographic area (2) related lake-specific characteristics of latitude, lake size, or time period was monitored. consisted >140,000 individual Secchi from 3,251 lakes that we summarized per lake-year, resulting 21,020 summer averages. Using...
Abstract Inland water bodies and their surface hydrologic connections are active components in the landscape, influencing multiple ecological processes that can propagate to broad‐scale phenomena such as regional nutrient carbon cycles metapopulation dynamics. However, while lake, wetland, stream abundance has been estimated at global extents, less attention paid freshwater connectivity attributes among aquatic systems macroscales. Thus, continental patterns of poorly understood. We measured...
Synopsis In experiments lakes 223 (L223) and 302 South (L302S) in the Experimental Lakes Area north-western Ontario, Little Rock Lake (LRL) northern Wisconsin, were progressively acidified with sulphuric acid from original pH values of 6.1–6.8 to 4.7–5.1. Although at different locations physical settings assemblages plants animals including fish, there remarkable similarities their responses, particularly regard biogeochemical processes effects on biota lower trophic levels. All three...
We analyzed a diverse set of 1,646 north‐temperate lakes to evaluate the nutrient‐color paradigm that integrates total phosphorus (TP) and colored dissolved organic carbon define lake trophic status. Our objectives were quantify combined influence TP color (Col) on status, determine if Col had similar relationships with hydrogeomorphic (HGM) variables, examine how affected balance heterotrophic autotrophic processes. For latter we examined chlorophyll ratio (Col : Chl a), an index...
If different Cladocera have similar minimum requirements for suspended food, the capacity to utilize sedimented material would shift competitive advantage facultative bottom foragers in ponds, shallow lakes, and laboratory cultures with fluctuating levels of planktonic food. In cultures, Daphnia pulex browses or forages on its culture vessel when food concentration is too low support reproduction high rates ingestion. Suspension feeding grazing primary mechanism only above incipient limiting...
1. For north temperate lakes, the well-studied empirical relationship between phosphorus (as measured by total phosphorus, TP), most commonly limiting nutrient and algal biomass chlorophyll a, CHL) has been found to vary across a wide range of landscape settings. Variation in parameters these TP–CHL regressions attributed such lake variables as nitrogen/phosphorus ratios, organic carbon alkalinity, all which are strongly related catchment characteristics (e.g. natural land cover human use)....
Abstract Macroscale studies of aquatic ecosystems are needed to address many contemporary broad‐scale problems related global change, particularly inform national‐scale environmental policies. In this data paper, we fill two important gaps in availability for lakes at the scale conterminous U.S., lack of: (1) high‐resolution geographic representations and their watersheds (2) an open platform connect disparate U.S. lake datasets. We describe LAGOS‐US LOCUS v1.0 module that includes a...
Climate change is predicted to intensify lake algal blooms globally and result in regime shifts. However, observed increases biomass do not consistently correlate with air temperature or precipitation, evidence lacking for a causal effect of climate the nonlinear dynamics needed demonstrate We modeled effects on annual chlorophyll (a measure biomass) over 34 y 24,452 lakes across broad ecoclimatic zones United States evaluated potential found that was causally related 34% lakes. In these...