A5011670679- Fish Ecology and Management Studies
- Marine and fisheries research
- Soil and Water Nutrient Dynamics
- Hydrology and Watershed Management Studies
- Aquatic Invertebrate Ecology and Behavior
- Freshwater macroinvertebrate diversity and ecology
- Hydrology and Sediment Transport Processes
- Fish Biology and Ecology Studies
- Marine animal studies overview
- Hydrological Forecasting Using AI
- Marine and coastal ecosystems
- Marine Bivalve and Aquaculture Studies
- Avian ecology and behavior
- Ecology and biodiversity studies
- Coastal and Marine Management
- Water-Energy-Food Nexus Studies
- Isotope Analysis in Ecology
- Arctic and Antarctic ice dynamics
- Water Quality and Resources Studies
- Water Quality Monitoring Technologies
- Physiological and biochemical adaptations
- American Environmental and Regional History
Forest and Rangeland Ecosystem Science Center
2020-2023
United States Geological Survey
2008-2023
Boston University
2022
University of Idaho
2013-2018
Washington State University
2016
University of California, Davis
2013
California Department of Health Care Services
2013
Western Fisheries Research Center
2008
United States Fish and Wildlife Service
2007
Abstract Hypoxia in coastal waters and lakes is widely recognized as a detrimental environmental issue, yet we lack comparable understanding of hypoxia rivers. We investigated controls on using 118 million paired observations dissolved oxygen (DO) concentration water temperature over 125,000 locations rivers from 93 countries. found (DO < 2 mg L −1 ) 12.6% all river sites across 53 countries, but no consistent trend prevalence since 1950. High‐frequency data reveal 3‐h median duration...
We used a combination of published literature and field survey data to synthesize the available information about habitat use by delta smelt Hypomesus transpacificus, declining native species in San Francisco Estuary. Delta ranges from Pablo Suisun bays their freshwater tributaries, including Sacramento Joaquin rivers. In recent years, substantial numbers have colonized Liberty Island, north area that flooded 1997. The has more upstream distribution during spawning as opposed juvenile...
While there is substantial information about the upstream migration of commercially and recreationally important fishes, relatively little known small-bodied species, particularly through estuaries. In San Francisco Estuary, a major need to understand behavior delta smelt Hypomesus transpacificus, small pelagic fish listed under state federal endangered species acts. The spawning period may be critical as movements can result in entrainment water diversions. general, live low-salinity zone...
Abstract Recent advances in high‐frequency environmental sensing and statistical approaches have greatly expanded the breadth of knowledge regarding aquatic ecosystem metabolism—the measurement interpretation gross primary productivity (GPP) respiration (ER). Aquatic scientists are poised to take advantage widely available datasets freely‐available modeling tools apply functional information gained through metabolism help inform management. Historically, several logistical conceptual factors...
While there is substantial information about the upstream migration of commercially and recreationally important fishes, relatively little known small-bodied species, particularly through estuaries. In San Francisco Estuary, a major need to understand behavior delta smelt Hypomesus transpacificus, small pelagic fish listed under state federal endangered species acts. The spawning period may be critical as movements can result in entrainment water diversions. general, live low-salinity zone...
Summary In stream ecosystems, P acific salmon deliver subsidies of marine‐derived nutrients and disturb the bed during spawning. The net effect this nutrient subsidy physical disturbance on biological communities can be hard to predict is likely mediated by environmental conditions. For periphyton, empirical studies have revealed that magnitude direction response varies from one location next. Salmon appear increase periphyton biomass and/or production in some contexts (a positive response),...
Dam operations can affect mixing of the water column, thereby influencing thermal heterogeneity spatially and temporally. This occurs by restricting or eliminating connectivity in longitudinal, lateral, vertical, temporal dimensions. We examined across space time identified potential cold-water refuges for salmonids a large impounded river inland northwestern USA. To describe these patterns, we used infrared (TIR) imagery, situ thermographs, high-resolution, 3-D hydraulic mapping. explained...
Abstract We assessed the impact of predation by smallmouth bass Micropterus dolomieu and largemouth M. salmoides on juveniles federally listed Chinook salmon Oncorhynchus tshawytscha other anadromous salmonid populations in Lake Washington system. Bass were collected with boat electrofishing equipment south end (February–June) Ship Canal (LWSC; April–July), a narrow waterway that smolts must migrate through to reach marine environment. Genetic analysis was used identify ingested salmonids...
Materials, energy, and organisms from groundwater serve as resource subsidies to lotic systems. These influence food production post-emergent fish growth condition through nutrient inputs water temperature changes. To test whether grew faster in gaining sites, we hatchery salmon enclosures, sampled periphyton, benthic invertebrates, wild salmon, modeled across a gradient of – surface exchange. Fish almost twice fast (2.7%·day −1 ) than losing (1.5%·day sites. transient sites much but their...
Abstract Like several other fishes in the pelagic community of upper San Francisco Estuary, age‐0 striped bass Morone saxatilis have shown a major decline based on midwater trawl sampling program that has been conducted for over 40 years. We hypothesized apparent might be partially attributable to behavioral shift away from channels sampled by trawls. found no evidence an upstream–downstream distribution. Instead, distribution remains closely associated with low‐salinity zone estuary....
This study was conducted to characterize fishery resources inhabiting salt-evaporation ponds and sloughs in South San Francisco Bay, identify key environmental variables that influence distribution of fishes. The ponds, which were originally constructed operated for commercial production salt, have undergone preliminary modifications (installation culverts, gates, other water-control structures) preparation full restoration mostly tidal wetlands over the next 2 decades. We sampled fish from...
Restoring degraded rivers requires initial assessment of the fluvial landscape to identify stressors and riverine features that can be enhanced. We associated local-scale river habitat data collected using standardized national monitoring tools with modeled regional water temperature flow on mid-sized northwest U.S. (30-60 m wide). grouped these according quartiles their mean August examined physical structure flow. then used principal components analysis summarize variation in several...
You can learn a lot about rivers, lakes, estuaries, and oceans by looking down at them from the sky. Scientists use technique called remote sensing to measure amount of light or heat energy reflected emitted Earth. Sensors be on satellites mounted airplanes, helicopters, drones. this information map quality water in San Francisco Bay-Delta estuary. Remote helps scientists see where when there might problems for human health plants animals living