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Border Rivers Watershed
EPA Grant Number: R825433C035Subproject: this is subproject number 035 , established and managed by the Center Director under grant R825433
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
Center: EERC - Center for Ecological Health Research (Cal Davis)
Center Director: Rolston, Dennis E.
Title: Border Rivers Watershed
Investigators: Hinton, David E. , McCoy, Michael , Quinn, James
Institution: University of California - Davis
EPA Project Officer: Levinson, Barbara
Project Period: October 1, 1996 through September 30, 2000
RFA: Exploratory Environmental Research Centers (1992)
Research Category: Targeted Research , Center for Ecological Health Research
Description:
Objective:This project seeks to utilize the methods and techniques developed in the Sacramento River Project (R825433C002) and the Decision Support Core in other riverine ecosystems in California.
Approach:An integral part of the Center's mission is to export to other geographic locations the methods developed for the original watersheds studied in the Center. The Border Rivers Watershed provides such an opportunity. There are two Southern California rivers in this project, the New River and the Lower Colorado River.
The New and Lower Colorado rivers both cross the border with Mexico, the New River flowing from Mexico into California and the Lower Colorado River flowing from California/ Arizona to Mexico. The international aspect of this project brings additional challenges for sampling and data acquisition.
The Sacramento River project combined terrestrial and aquatic ecosystem studies to better meet Center objectives. By placing greater importance on studying the mechanisms of multiple stressor toxicity, the scope of this project now extends from the molecular and cellular levels, to diminished fecundity of individuals, leading to the decline of populations and loss of biodiversity at community and ecosystem levels. A valuable feature of the Center is its emphasis on comparative studies. In some instances, common mechanisms of action are being discovered in birds, fish, and rodents, enhancing our ability to interpret findings throughout the ecosystem.
Critical questions included: (a) which molecular, cellular, and organismal test systems best reveal effects of the stressors in each of the species of concern (b) which tests best indicate whether effects of multiple stressors are additive, antagonistic, or synergistic (c) which mechanisms link levels of biological organization, and (d) how might these affect targets of future investigative processes?
Expected Results:Future studies will also emphasize effects on birds living along agricultural drains. These will focus on bioaccumulation of metals and of endocrine disruptive pesticides (dicofol, endosulfan, lindane, alkylphenols as mixing agents for agricultural chemicals). Laboratory models will be used for egg injections, chick exposures, and determination of the critical periods in development where agricultural chemical exposure will have a developmental impact.
The role of bioavailability and relationship to meaningful estimates of pollutant fate and transport is a major future goal. Seasonal riverine processes which may influence bioavailability will be assessed and used to better predict biologically relevant aspects of fate and transport.
Supplemental Keywords:wetlands, ecosystem stress, multiple stressors, bioavailability, biomarkers, hydrodynamic models, mercury, selenium, runoff, River ecosystems. , Ecosystem Protection/Environmental Exposure & Risk, Water, INTERNATIONAL COOPERATION, Scientific Discipline, RFA, ECOSYSTEMS, Water & Watershed, Restoration, Aquatic Ecosystem Restoration, Aquatic Ecosystems & Estuarine Research, Terrestrial Ecosystems, Aquatic Ecosystem, Biochemistry, Environmental Microbiology, Watersheds, Ecology and Ecosystems, ecological impact, watershed management, watershed restoration, ecological research, Border Rivers, contaminant exposure, aquatic ecosystems, environmental stress, mercury, anthropogenic stress, restoration strategies, ecosystem stress
Progress and Final Reports:
1999 Progress Report
Main Center Abstract and Reports:
R825433 EERC - Center for Ecological Health Research (Cal Davis)
Subprojects under this Center:
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
R825433C001 Potential for Long-Term Degradation of Wetland Water Quality Due to Natural Discharge of Polluted Groundwater
R825433C002 Sacramento River Watershed
R825433C003 Endocrine Disruption in Fish and Birds
R825433C004 Biomarkers of Exposure and Deleterious Effect: A Laboratory and Field Investigation
R825433C005 Fish Developmental Toxicity/Recruitment
R825433C006 Resolving Multiple Stressors by Biochemical Indicator Patterns and their Linkages to Adverse Effects on Benthic Invertebrate Patterns
R825433C007 Environmental Chemistry of Bioavailability in Sediments and Water Column
R825433C008 Reproduction of Birds and mammals in a terrestrial-aquatic interface
R825433C009 Modeling Ecosystems Under Combined Stress
R825433C010 Mercury Uptake by Fish
R825433C011 Clear Lake Watershed
R825433C012 The Role of Fishes as Transporters of Mercury
R825433C013 Wetlands Restoration
R825433C014 Wildlife Bioaccumulation and Effects
R825433C015 Microbiology of Mercury Methylation in Sediments
R825433C016 Hg and Fe Biogeochemistry
R825433C017 Water Motions and Material Transport
R825433C018 Economic Impacts of Multiple Stresses
R825433C019 The History of Anthropogenic Effects
R825433C020 Wetland Restoration
R825433C021 Sierra Nevada Watershed Project
R825433C022 Regional Transport of Air Pollutants and Exposure of Sierra Nevada Forests to Ozone
R825433C023 Biomarkers of Ozone Damage to Sierra Nevada Vegetation
R825433C024 Effects of Air Pollution on Water Quality: Emission of MTBE and Other Pollutants From Motorized Watercraft
R825433C025 Regional Movement of Toxics
R825433C026 Effect of Photochemical Reactions in Fog Drops and Aerosol Particles on the Fate of Atmospheric Chemicals in the Central Valley
R825433C027 Source Load Modeling for Sediment in Mountainous Watersheds
R825433C028 Stress of Increased Sediment Loading on Lake and Stream Function
R825433C029 Watershed Response to Natural and Anthropogenic Stress: Lake Tahoe Nutrient Budget
R825433C030 Mercury Distribution and Cycling in Sierra Nevada Waterbodies
R825433C031 Pre-contact Forest Structure
R825433C032 Identification and distribution of pest complexes in relation to late seral/old growth forest structure in the Lake Tahoe watershed
R825433C033 Subalpine Marsh Plant Communities as Early Indicators of Ecosystem Stress
R825433C034 Regional Hydrogeology and Contaminant Transport in a Sierra Nevada Ecosystem
R825433C035 Border Rivers Watershed
R825433C036 Toxicity Studies
R825433C037 Watershed Assessment
R825433C038 Microbiological Processes in Sediments
R825433C039 Analytical and Biomarkers Core
R825433C040 Organic Analysis
R825433C041 Inorganic Analysis
R825433C042 Immunoassay and Serum Markers
R825433C043 Sensitive Biomarkers to Detect Biochemical Changes Indicating Multiple Stresses Including Chemically Induced Stresses
R825433C044 Molecular, Cellular and Animal Biomarkers of Exposure and Effect
R825433C045 Microbial Community Assays
R825433C046 Cumulative and Integrative Biochemical Indicators
R825433C047 Mercury and Iron Biogeochemistry
R825433C048 Transport and Fate Core
R825433C049 Role of Hydrogeologic Processes in Alpine Ecosystem Health
R825433C050 Regional Hydrologic Modeling With Emphasis on Watershed-Scale Environmental Stresses
R825433C051 Development of Pollutant Fate and Transport Models for Use in Terrestrial Ecosystem Exposure Assessment
R825433C052 Pesticide Transport in Subsurface and Surface Water Systems
R825433C053 Currents in Clear Lake
R825433C054 Data Integration and Decision Support Core
R825433C055 Spatial Patterns and Biodiversity
R825433C056 Modeling Transport in Aquatic Systems
R825433C057 Spatial and Temporal Trends in Water Quality
R825433C058 Time Series Analysis and Modeling Ecological Risk
R825433C059 WWW/Outreach
R825433C060 Economic Effects of Multiple Stresses
R825433C061 Effects of Nutrients on Algal Growth
R825433C062 Nutrient Loading
R825433C063 Subalpine Wetlands as Early Indicators of Ecosystem Stress
R825433C064 Chlorinated Hydrocarbons
R825433C065 Sierra Ozone Studies
R825433C066 Assessment of Multiple Stresses on Soil Microbial Communities
R825433C067 Terrestrial - Agriculture
R825433C069 Molecular Epidemiology Core
R825433C070 Serum Markers of Environmental Stress
R825433C071 Development of Sensitive Biomarkers Based on Chemically Induced Changes in Expressions of Oncogenes
R825433C072 Molecular Monitoring of Microbial Populations
R825433C073 Aquatic - Rivers and Estuaries
R825433C074 Border Rivers - Toxicity Studies