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Author: Nancy Torres Publisher: ISBN: Category : Coastal ecology Languages : en Pages : 0
Book Description
Although the Tijuana River Estuary (TRE) remains the largest, most-intact coastal wetland in Southern California, it has a history of major changes, much of this related to its location immediately north of the US / Mexico Border. One of the primary challenges is cross-border flows from the rapidly growing city of Tijuana, Baja California, Mexico, and the delivery of wastewater, debris, and sediment to sensitive coastal wetland ecosystems. There is a need to more fully investigate these environmental changes to assess the ecosystem health of the Tijuana River Estuary over time, especially related to pollution impacts. This can inform an understanding of changes in both species and stressors, and can also help assess the effectiveness of past management strategies. Since 1986, the NOAA Mussel Watch and California Surface Water Ambient Monitoring Programs have periodically collected data on chemical contaminants and biological indicators of water quality in the TRE. This project builds on these past monitoring efforts and established methodologies to assess status and trends of contaminants in sediment and organisms. This work was accomplished by conducting a thorough review of available datasets and literature to document past changes in the estuary and refine sampling approaches. Sampling was conducted at three locations in the Tijuana River Estuary to assess spatial variability. Compared to national thresholds, most contaminant concentrations were at relatively low levels in 2021, with some having decreased from previously higher levels in the 90s. When comparing species groups, fishes had the highest organic concentrations, indicating the ongoing processes of bioaccumulation and biomagnification. Levels of some organics in fish, such as total DDT and PBDEs, remain at levels which could be of some concern for sensitive piscivorous birds. Also, the highest concentrations were near a local urban outfall point rather than from the Tijuana River itself. Overall, this information improves our ability to document and interpret long-term trajectories of contaminant change in the ambient environment and key taxa. This project's results include communication and management tools depicting the estuary's ecosystem health over time.
Author: Nancy Torres Publisher: ISBN: Category : Coastal ecology Languages : en Pages : 0
Book Description
Although the Tijuana River Estuary (TRE) remains the largest, most-intact coastal wetland in Southern California, it has a history of major changes, much of this related to its location immediately north of the US / Mexico Border. One of the primary challenges is cross-border flows from the rapidly growing city of Tijuana, Baja California, Mexico, and the delivery of wastewater, debris, and sediment to sensitive coastal wetland ecosystems. There is a need to more fully investigate these environmental changes to assess the ecosystem health of the Tijuana River Estuary over time, especially related to pollution impacts. This can inform an understanding of changes in both species and stressors, and can also help assess the effectiveness of past management strategies. Since 1986, the NOAA Mussel Watch and California Surface Water Ambient Monitoring Programs have periodically collected data on chemical contaminants and biological indicators of water quality in the TRE. This project builds on these past monitoring efforts and established methodologies to assess status and trends of contaminants in sediment and organisms. This work was accomplished by conducting a thorough review of available datasets and literature to document past changes in the estuary and refine sampling approaches. Sampling was conducted at three locations in the Tijuana River Estuary to assess spatial variability. Compared to national thresholds, most contaminant concentrations were at relatively low levels in 2021, with some having decreased from previously higher levels in the 90s. When comparing species groups, fishes had the highest organic concentrations, indicating the ongoing processes of bioaccumulation and biomagnification. Levels of some organics in fish, such as total DDT and PBDEs, remain at levels which could be of some concern for sensitive piscivorous birds. Also, the highest concentrations were near a local urban outfall point rather than from the Tijuana River itself. Overall, this information improves our ability to document and interpret long-term trajectories of contaminant change in the ambient environment and key taxa. This project's results include communication and management tools depicting the estuary's ecosystem health over time.
Author: Eduardo Alves de Almeida Publisher: CRC Press ISBN: 1482212897 Category : Science Languages : en Pages : 402
Book Description
The tropical zone contains the highest diversity of fish species on the planet. Many of these species are being continuously exposed to pollutants that pose serious hazards to fish health thereby posing serious risks for entire fish populations. This book presents information about the different responses of fish to pollutants from the molecular le
Author: William Leonard Balthis Publisher: ISBN: Category : Environmental impact analysis Languages : en Pages : 52
Book Description
The Guana Tolomato Matanzas reserve is one of 28 National Estuarine Research Reserves (GTMNERR) encompassing approximately 73,300 acres of salt marsh and mangrove tidal wetlands, oyster bars, estuarine lagoons, upland areas, and offshore ocean waters along the northeastern coast of Florida in St. Johns and Flagler Counties (Figure 1). The reserve consists of a northern and southern component separated geographically by the City of St. Augustine. The northern component includes the Tolomato and Guana River estuaries and adjacent offshore waters and the southern component contains the Matanzas River. The GTM-NERR, managed under a partnership between the National Oceanic and Atmospheric Administration (NOAA) and Florida Department of Environmental Protection (DEP), was established to promote 'conservation of natural biodiversity and cultural resources through research and monitoring to guide science-based stewardship and education strategies'. A NERR System-Wide Monitoring Program (SWMP) was developed to improve fundamental understanding of the temporal and spatial dynamics of estuarine processes and to provide baseline information for evaluating change in ecosystem function in response to natural and human disturbances (NERRS 2011). Although water-quality monitoring has been a major focus of SWMP at GTM and other NERR locations, additional research efforts of various partnering institutions provide a variety of other complementary data to help address NERRS science and management needs. Accordingly, a study was initiated in summer 2014, through collaborative efforts by NOAA's National Centers for Coastal Ocean Science (NCCOS) and GTM-NERR staff, to assess the status of ecosystem condition and potential stressor impacts throughout submerged (subtidal, with the exception of intertidal oyster) habitats of the GTM reserve using multiple indicators of ecological condition. Results, reported herein, are intended to help address priority science and management research gaps identified in the GTM-NERR Site Profile and Management Plan, including characterization of submerged habitats and associated living resources, biological monitoring with measures of biodiversity and condition, and GIS-based mapping of submerged habitats to serve as baselines for future change analysis"--Introduction. [doi:10.7289/V5/TM-NOS-NCCOS-231 (https://doi.org/10.7289/V5/TM-NOS-NCCOS-231)].
Author: Clark, JR. Publisher: ISBN: Category : Contaminants Languages : en Pages : 14
Book Description
A sampling strategy designed around contaminant source (agricultural runoff, direct discharge) and fate (solubles, particulates, sediments) and the hydrodynamics of the system studied is required to characterize the exposure of estuarine biota to contaminants. Field data obtained on contaminant effects should be applicable to risk assessment in order to verify approaches to predicting contaminant fate and effects in estuarine systems. Only through systematic evaluations of field and laboratory exposure-response relationships will we be able to quantify the limits of applicability of laboratory data used for ecological risk assessment. Survival of caged test animals at field test sites provides data for direct comparison with laboratory toxicity test results. Coupling survival and other effects data from caged animal studies with assessments of stocks and dynamics of populations of the same or a related species at the field site may allow extrapolation from simple laboratory and field test results (acute or chronic) to more complex and ecologically significant endpoints. This paper presents examples of various approaches to contaminant problems in estuaries and discusses their applications to risk assessment procedures.
Author: Samuel Safran Publisher: ISBN: 9780990898597 Category : Science Languages : en Pages : 228
Book Description
The Tijuana River Valley Historical Ecology Investigation synthesizes hundreds of historical maps, photographs, and texts to reconstruct the ecological, hydrological, and geomorphic conditions of the Tijuana River valley prior to major European-American landscape modification. How did the valley look and function before there was the state of California, the city of Tijuana, or an international border? What habitat types and wildlife were found there? How have these habitat types and the physical processes that shaped them changed over time? And finally, what can the valley's ecological past tell us about its present and future? In answering these fundamental questions, this richly-illustrated study provides scientists, managers, and residents in the valley with information designed to support and inspire ongoing management and restoration activities.
Author: Nancy Torres
Author: Nancy Torres
Author: René Langis
Author: Joy B. Zedler
Author: 
Author: United States. Environmental Protection Agency
Author: Eduardo Alves de Almeida
Author: William Leonard Balthis
Author: 
Author: Clark, JR.
Author: Samuel Safran