A5076389576- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Hydrology and Sediment Transport Processes
- Aquatic Ecosystems and Phytoplankton Dynamics
- Hydrology and Watershed Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Marine and coastal ecosystems
- Coastal wetland ecosystem dynamics
- Aquatic Invertebrate Ecology and Behavior
- Aquatic Ecosystems and Biodiversity
- Water Quality and Resources Studies
- Water Quality Monitoring Technologies
- Land Use and Ecosystem Services
- Forest Ecology and Biodiversity Studies
- Species Distribution and Climate Change
- Flood Risk Assessment and Management
- Genetic diversity and population structure
- Ecology and biodiversity studies
- Mercury impact and mitigation studies
- Environmental Conservation and Management
- Soil erosion and sediment transport
- Ecosystem dynamics and resilience
- Marine and fisheries research
- Identification and Quantification in Food
- Water Quality and Pollution Assessment
United States Geological Survey
2013-2024
Upper Midwest Environmental Sciences Center
2011-2024
North Central Soil Conservation Research Laboratory
2012-2016
Oak Ridge National Laboratory
2003-2008
University of Wisconsin–Madison
1998-2003
Wake Forest University
1997
Responses of zooplankton, pelagic primary producers, planktonic bacteria, and CO2 exchange with the atmosphere were measured in four lakes contrasting food webs under a range nutrient enrichments during seven-year period. Prior to enrichment, manipulated create contrasts between piscivore dominance planktivore dominance. Nutrient inorganic nitrogen phosphorus exhibited ratios N:P > 17:1, by atoms, maintain P limitation. An unmanipulated reference lake, Paul Lake, revealed baseline...
The effects of water color on lake stratification, mean epilimnetic irradiance, and temperature dynamics were examined in small, north-temperate lakes that differed widely (1.5–19.8 m –1 ). Among these lakes, colored from clear the following ways: (i) epilimnia shallower colder, irradiance was reduced; (ii) diel cycles more pronounced; (iii) whole-lake heat accumulation during stratification reduced. depth epilimnion ranged 2.5 clearest to 0.75 most lake, 91% variation explained by color....
Delivery of water, sediments, nutrients, and organic matter to stream ecosystems is strongly influenced by the catchment can be altered greatly upland soil vegetation disturbance. At Fort Benning Military Installation (near Columbus, Georgia), spatial variability in intensity military training results a wide range intensities disturbance catchments. A set 8 streams catchments spanning this gradient was selected for investigation impact on hydrodynamics nutrient uptake. The size transient...
The concept of landscape legacies has been examined extensively in terrestrial ecosystems and led to a greater understanding contemporary ecosystem processes. However, although stream are tightly coupled with their catchments and, thus, probably affected strongly by historical catchment conditions, few studies have directly the importance landuse on streams. We relationships between land use (1944) (2000–2003) physical, chemical, biological conditions after accounting for influences (1999)...
Catchment characteristics determine the inputs of sediments and nutrients to streams. As a result, natural or anthropogenic disturbance upland soil vegetation can affect instream processes. The Fort Benning Military Installation (near Columbus, Georgia) exhibits wide range levels because spatial variability in intensity military training. This gradient was used investigate effect on rates stream metabolism (ecosystem respiration rate [ER] gross primary production [GPP]). Stream measured...
Availability of suitable overwintering habitat is crucial for the survival centrarchids in large floodplain rivers. However, there remains uncertainty spatiotemporal drivers conditions. We paired hydrogeomorphic characteristics with environmental data from 1994 to 2018 individual lentic areas (1) assess availability throughout Upper Mississippi River System using existing suitability indices (HSIs) and (2) explore potential overall (HSI O ) its components (dissolved oxygen, temperature,...
We evaluated the effect of whole-lake nutrient enrichment on Hg concentration in age-age-1 yellow perch Perca flavescens and assessed whether reduced fish from enriched lakes could be attributed solely to enhanced growth (i.e., dilution). A survey eighteight reference twotwo experimentally (P input = 2–6 mg · m−2 d−1; N : P > 25 1 by atoms) indicated that was highly correlated with lake pH (R2 0.87). Age-1 were four five times larger had 50% lower concentrations than an equivalent (reference...
Catchment characteristics determine the inputs of sediments and nutrients to streams. As a result, natural or anthropogenic disturbance upland soil vegetation can affect instream processes. The Fort Benning Military Installation (near Columbus, Georgia) exhibits wide range levels because spatial variability in intensity military training. This gradient was used investigate effect on rates stream metabolism (ecosystem respiration rate [ER] gross primary production [GPP]). Stream measured...
ABSTRACT Because catchment characteristics determine sediment and nutrient inputs to streams, upland disturbance can affect stream chemistry. Catchments at the Fort Benning Military Installation (near Columbus, Georgia) experience a range of intensities due spatial variability in intensity military training. We used this gradient investigate effects soil vegetation on During baseflow, mean total suspended (TSS) concentration inorganic (ISS) increased with (TSS: R 2 = 0.7, p 0.005, 4.0–10.1...
The Mississippi River and other large rivers have the potential to regulate nitrogen export from terrestrial landscapes, thus mitigate eutrophication in downstream aquatic ecosystems. In rivers, human-constructed impoundments connected backwaters may facilitate removal; however, capacity of these features is poorly quantified incompletely incorporated into model frameworks. Using a high-resolution spatially intensive sampling technique, we assessed contribution individual navigation pools,...
Summary Photosynthesis and respiration are primary drivers of dissolved oxygen dynamics in rivers. We measured dynamics, aquatic ecosystem metabolism, algal abundance nutrient concentrations at main channel backwater sites on a reach the Upper Mississippi River that borders states Wisconsin Minnesota (U.S.A.). asked (i) how metabolism rates, differed backwaters, (ii) whether relates to solar irradiance, concentration, abundance, temperature river discharge (iii) relationships between these...
Abstract Background Large-river decision-makers are charged with maintaining diverse ecosystem services through unprecedented social-ecological transformations as climate change and other global stressors intensify. The interconnected, dendritic habitats of rivers, which often demarcate jurisdictional boundaries, generate complex management challenges. Here, we explore how the Resist–Accept–Direct (RAD) framework may enhance large-river by promoting coordinated deliberate responses to...
Responses of zooplankton, pelagic primary producers, planktonic bacteria, and CO2 exchange with the atmosphere were measured in four lakes contrasting food webs under a range nutrient enrichments during seven-year period. Prior to enrichment, manipulated create contrasts between piscivore dominance planktivore dominance. Nutrient inorganic nitrogen phosphorus exhibited ratios N:P > 17:1, by atoms, maintain P limitation. An unmanipulated reference lake, Paul Lake, revealed baseline...
First posted December 13, 2018 For additional information, contact: Director, Upper Midwest Environmental Sciences CenterU.S. Geological Survey 2630 Fanta Reed Road La Crosse, WI 5460 This report documents the development of quantitative measures (indicators) ecosystem structure and function for use in a Habitat Needs Assessment (HNA) Mississippi River System (UMRS). HNAs are led periodically by U.S. Army Corps Engineers’ Restoration (UMRR) Program, which is primary habitat restoration...
Abstract Winters are changing rapidly across the globe but implications for aquatic productivity and food webs not well understood. In addition, degree to which winter dynamics in systems respond large‐scale climate versus ecosystem‐level factors is unclear important understanding managing potential changes. We used a unique data set from Upper Mississippi River System explore spatial temporal patterns phytoplankton biomass (chlorophyll , CHL) associated environmental covariates 25 years...