A5023463755- Fish Ecology and Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Marine and fisheries research
- Subterranean biodiversity and taxonomy
- Fish Biology and Ecology Studies
- Hydrology and Sediment Transport Processes
- Freshwater macroinvertebrate diversity and ecology
- Soil and Water Nutrient Dynamics
- Wildlife Ecology and Conservation
- Marine Biology and Ecology Research
- Hydrology and Watershed Management Studies
- Isotope Analysis in Ecology
- Water Quality and Resources Studies
- Marine Bivalve and Aquaculture Studies
- Crustacean biology and ecology
- Karst Systems and Hydrogeology
- Coastal wetland ecosystem dynamics
- Archaeology and Natural History
- Water Quality and Pollution Assessment
- Environmental Sustainability and Technology
- Oceanographic and Atmospheric Processes
- Environmental DNA in Biodiversity Studies
- Hydrological Forecasting Using AI
- Arctic and Russian Policy Studies
California Water Science Center
2020-2024
United States Geological Survey
2020-2024
New Mexico State University
2016-2023
West Virginia University
2012-2022
California Science Center
2022
University of Alabama
2011-2019
University of Alaska Fairbanks
2017-2019
West Virginia Division of Natural Resources
2014
Abstract We quantified movements of brook trout Salvelinus fontinalis and brown Salmo trutta in a complex riverscape characterized by large, open‐canopy main stem small, closed‐canopy tributary eastern West Virginia, USA. Our objectives were to quantify the overall rate movement relate behaviors variation streamflow, water temperature, access coldwater refugia. The study area experienced extremely high seasonal, yearly, among‐stream variability temperature flow. relative mobility within...
Spatial population models predict strong density-dependence and relatively stable dynamics near the core of a species' distribution with increasing variance importance density-independent processes operating towards periphery. Using 10-year data set an information-theoretic approach, we tested series candidate considering density-dependent controls on brook trout across core-periphery gradient within central Appalachian watershed. We sampled seven sub-populations study sites ranging in...
1. Surface ecosystems provide the primary source of organic matter to many cave communities. Variation in strength connectivity surface suggests that some caves may be more resource-limited than others. To test this, we examined diet, prey availability and production an obligate salamander Gyrinophilus palleucus (Plethodontidae), a top predator, two south-eastern U.S.A. with different levels (Tony Sinks cave, 165 g AFDM m−2; Bluff River 62 m−2). 2. We quantified density, biomass, growth...
Climate projections and their effects have been evaluated in the San Francisco Estuary as part of U.S. Geological Survey’s CASCaDE2 project. Understanding ecological climate change can help manage maintain health productivity Estuary. In this study, we assessed downscaled air temperature data from 10 global models (GCMs) under two representative concentration pathway (RCP) trajectories for greenhouse gas concentrations three regions Estuary: Suisun Grizzly Bays, marsh, Sacramento-San Joaquin...
Abstract Poor growth and survival in freshwater marine environments have been implicated as responsible for Chinook salmon ( Oncorhynchus tshawytscha ) declines across Alaska. Lateral connectivity of river main stems with off‐channel habitats may play an integral role sustaining Alaskan salmonid populations because commonly provide greater opportunities than stem through macroinvertebrate productivity warmer water temperatures. However, impose mortality risks to juvenile salmonids, these are...
Detrital inputs into ecosystems vary in quantity and quality (e.g., plant litter vs carrion). Variability detrital potentially affects consumer biomass rates of organic matter (OM) breakdown. We used cave streams to test 2 linked hypotheses regarding the influence total on breakdown high-quality carrion detritus. First, we hypothesized that systems with higher OM availability would support a consumers. Second, predicted cause faster rates. To these hypotheses, quantified macroinvertebrate...
Density-dependent (DD) and density-independent (DI) habitat selection is strongly linked to a species' evolutionary history. Determining the relative importance of each necessary because declining populations are not always result altered DI mechanisms but can often be DD via reduced carrying capacity. We developed spatially temporally explicit models throughout Chena River, Alaska predict important that influence Chinook salmon spawning success. used resource-selection functions suitable...
Abstract Density‐dependent (DD) and density‐independent (DI) effects play an important role in shaping fish growth rates, attribute that correlates with many life history traits fishes. Consequently, understanding the extent to which DD DI influence rates is valuable for fisheries assessments because it can inform managers about how populations may respond as environmental conditions continue change (e.g., threats from climate change). We used a Rio Grande Cutthroat Trout Oncorhynchus...
Fish monitoring gears rarely capture all available fish, an inherent bias in programs referred to as catchability. Catchability is a source of that can be affected by numerous aspects gear deployment (e.g., speed, mesh size, and avoidance behavior). Thus, care must taken when multiple surveys—especially those using different sampling methods—are combined answer spatio-temporal questions about population community dynamics. We assessed relative catchability differences among four long-term...
Abstract Estuaries represent critical aquatic habitat that connects surface water distributed between Earth’s landmasses and oceans. They are dynamic transitional ecosystems, which provide important for fishes other organisms. Effective conservation of species inhabiting estuaries requires knowledge the features drive their abundance distribution. We sought to elucidate how stationary (i.e., wetlands, shoals, channels) salinity, temperature, turbidity, chlorophyll concentration) interact...
First posted January 16, 2024 For additional information, contact: Director,California Water Science CenterU.S. Geological Survey6000 J Street, Placer HallSacramento, California 95819 The Bureau of Reclamation (Reclamation) operates the Central Valley Project (CVP), one nation's largest water projects. has an ongoing need to improve scientific basis for adaptive management CVP and, by extension, joint operations with California's State Project. U.S. Survey (USGS) works cooperatively provide...
Diversity in habitat and life-history strategies promote a species' long-term persistence. However, are most commonly studied at broad spatial temporal scales. We applied longevity growth models closed N-mixture to examine within- versus between stream variability characteristics of Rio Grande Cutthroat Trout northern New Mexico streams. developed von Bertalanffy model hierarchical Bayesian framework the importance fine-scale temperature density-dependence on abundance. The indicated that...
Abstract Terminal channels were historically a common feature of tidal delta ecosystems but have become increasingly rare as landscapes been modified. Tidal hydrodynamics are defining in terminal channel from which native aquatic communities evolved. However, few studies explored the relationship between fish community structure and these ecosystems. We sampled throughout network within northeasternmost region San Francisco Estuary to determine environments. collected two years (2017 2018)...
Abstract The impacts of climate change on cold‐water fishes will likely negatively manifest in populations at the trailing edge their distributions. Rio Grande cutthroat trout ( Oncorhynchus clarkii virginalis , RGCT) occupy arid south‐western U.S. streams southern‐most all distributions, making RGCT particularly vulnerable to anticipated warming and drying this region. We hypothesised that possess a portfolio life‐history traits aid persistence within varying temperature stream conditions....
Accurate estimates of abundance are a cornerstone for resource managers to make effective decisions fish conservation. However, multiple sampling methods often required sample communities and ignoring the detection process can create substantial bias in latent state parameter estimation (e.g., abundance, survival). We developed joint-species N-mixture model that integrated snorkel, seining, electrofishing surveys estimate factors affecting native non-native distributions Santa Ana River,...
Largemouth bass (LMB; Micropterus salmoides) recruitment is limited by a critical developmental period during early life stages, but this mechanism may be less important within non-native habitats. We conducted boat electrofishing surveys in four tidal lakes of California’s Sacramento–San Joaquin Delta (SSJD) from 2010 to 2011 describe introduced LMB dynamics. evaluated growth, proximate composition, and health indices young-of-the-year (YOY) among developed an integrated count model...
Success of stream restoration can be difficult to define because many interacting abiotic and biotic factors across spatio‐temporal scales have measurable effects. Consequently, failure in habitat achieve targeted biological goals may reflect interactions with unaccounted risks that yet addressed on the landscape. This is particularly true within invaded landscapes, where benefit non‐native competitors as much native fishes for which designed. We tested effects a reach scale effort trout...