A5047702056- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Water Quality and Pollution Assessment
- Environmental DNA in Biodiversity Studies
- Hydrology and Sediment Transport Processes
- Hydrological Forecasting Using AI
- Groundwater and Isotope Geochemistry
- Species Distribution and Climate Change
- Identification and Quantification in Food
- Microbial Community Ecology and Physiology
- Invertebrate Taxonomy and Ecology
- Aquatic Invertebrate Ecology and Behavior
- Physical Activity and Health
- Groundwater and Watershed Analysis
- Energy, Environment, and Transportation Policies
- Fire effects on ecosystems
- Marine and fisheries research
- Water Quality and Resources Studies
- Sustainability and Climate Change Governance
- Air Quality Monitoring and Forecasting
- Wildlife Ecology and Conservation
- Coastal and Marine Management
- Genetic diversity and population structure
California State University, Monterey Bay
2017-2024
American Museum of Natural History
2022
Iowa State University
2022
Desert Research Institute
2014-2020
Utah State University
2006-2019
University of Wisconsin–Eau Claire
2017
University of Tampa
2009
Michigan State University
1967
St. Mary's University, Texas
1967
University of Minnesota
1967
Benchmarks provide context and are a critical element of all ecological assessments. Over the last 25 y, hundreds papers have been published on various aspects assessments, most analyses described in these depend specifying an benchmark for context. Freshwater scientists managers usually use reference sites (typically natural or least-disturbed condition) to assess conditions at other sites. Accurate precise assessments require that assessed be matched with appropriate conditions. Two...
Ion-specific standards are needed to protect biodiversity
Diatom-based indicators can contribute significantly to comprehensive assessments of stream biological conditions. We used modeling develop, evaluate, and compare 2 types diatom-based for Idaho streams: an observed/expected (O/E) ratio taxon loss derived from a model similar the River InVertebrate Prediction And Classification System (RIVPACS) multimetric index (MMI). Modeling effects natural environmental gradients on assemblage composition is key component RIVPACS, but has seldom been MMI...
Robust predictions of stream solute concentrations expected under natural (reference) conditions would help establish more realistic water quality standards and improve ecological assessments. Models predicting from environmental factors also identify the relative importance different that influence chemistry. Although data are available describing major controlling chemistry (i.e., geology, climate, atmospheric deposition, soils, vegetation, topography), geologic maps do not adequately...
We used field-derived data from streams in Nevada, USA, to quantify relationships between stream biological condition, in-stream stressors, and potential sources of stress (land use). 2 freshwater macroinvertebrate-based indices measure condition: a multimetric index (MMI) an observed expected (O/E) taxonomic completeness. considered 4 categories stressors: dissolved metals, total solids, nutrients, flow alteration. For physicochemical factors that varied predictably across natural...
Agricultural, industrial and urban development have all contributed to increased salinity in streams rivers, but the likely effects of future climate change are unknown. I developed two empirical models estimate how these combined might affect by end this century (measured as electrical conductivity, EC). The first model predicts natural background from static (e.g. geology soils) dynamic (i.e. vegetation) environmental factors explained 78% variation EC. then compared estimated EC with...
Summary Spatial distributions of many freshwater invertebrates are associated with the concentration total dissolved solids ( TDS ) in streams (usually measured as specific electrical conductivity – EC ). These patterns presumably caused by taxon‐specific effects on maintenance ion and water balance, which is energetically expensive thus could affect fitness. However, no studies have assessed if ‐related fitness metrics, such growth survival, predictive distributions. We used stream‐side,...
Salinization of surface waters is a global environmental issue that can pose regional risk to freshwater organisms, potentially leading high and economic costs. Global change including climate land use increase the transport ions into waters. We fit both multiple linear regression (LR) random forest (RF) models on large spatial dataset predict Ca 2+ (266 sites), Mg (357 sites) ion concentrations as well electrical conductivity (EC—a proxy for total dissolved solids with 410 in German running...
Hybridization and introgression between introduced native salmonids threaten the continued persistence of many inland cutthroat trout species. Environmental models have been developed to predict spread introgression, but few studies assessed role propagule pressure. We used an extensive set fish stocking records geographic information system (GIS) data produce a spatially explicit index potential pressure exerted by rainbow in Upper Kootenay River, British Columbia, Canada. then logistic...
Ecologically meaningful and scientifically defensible nutrient criteria are needed to protect the water quality of USA streams. Criteria based on our best understanding naturally occurring concentrations would both aquatic biota. Previous approaches predicting natural background have relied some form landscape categorization (e.g., ecoregions) account for variability among bodies. However, variation within these regions is so high that use a single criterion can underprotect low-nutrient...
Understanding how background levels of dissolved minerals vary in streams temporally and spatially is needed to assess salinization fresh water, establish reasonable thresholds restoration goals, determine vulnerability extreme climate events like drought. We developed a random forest model that predicts natural specific conductivity (SC), measure total ions, for all stream segments the contiguous United States at monthly time steps between years 2001 2015. Models were trained using 11 796...
Abstract This study examined the accuracy of a new device (Caltrac) in estimating energy expenditure via acceleration measurements. Energy 20 high school students during basketball class activity (average length = 37 min) was estimated using Caltrac, heart rate recording, and video analysis. Heart recording analysis estimates were determined from rate, caloric curves, an rating scale, respectively. The following (M ± SD) found: 196 ±73 > Caltrac 163 ±49 film 123 30 kcal (p < .05). Laboratory...
The Biological Condition Gradient (BCG) is a conceptual model that describes changes in aquatic communities under increasing levels of anthropogenic stress. BCG helps decision-makers connect narrative water quality goals (e.g., maintenance natural structure and function) to quantitative measures ecological condition by linking index thresholds based on statistical distributions percentiles reference distributions) expert descriptions biological along disturbance gradients. As result, the may...