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The Role of Land-Use/Land-Cover and Sub-estuarine Ecosystem Nitrogen Cycling in the Regulation of Nitrogen Delivery to a River Dominated Estuary; Mobile Bay, Alabama

EPA Grant Number: R827072C013
Subproject: this is subproject number 013 , established and managed by the Center Director under grant R827072
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
Center: Alabama Center For Estuarine Studies (ACES)
Center Director: Shipp, Robert L.
Title: The Role of Land-Use/Land-Cover and Sub-estuarine Ecosystem Nitrogen Cycling in the Regulation of Nitrogen Delivery to a River Dominated Estuary; Mobile Bay, Alabama
Investigators: Pennock, Jonathan R. , Kiene, Ronald P. , Lehrter, John
Institution: University of South Alabama
EPA Project Officer: Perovich, Gina
Project Period: October 1, 1999 through September 30, 2000
RFA: Alabama Center For Estuarine Studies (ACES) (1999)
Research Category: Targeted Research , Ecological Restoration

Description:

Objective:

The overall goal of this study is to compare the effect of different predominant land-use/land-cover complexes on non-point source nitrogen (N) and phosphorus (P) loading, biogeochemical nutrient processing and ecosystem response in coupled watershed-estuarine ecosystems. The project is being carried out in three sub-estuaries of Mobile Bay with distinctly different land-use and land-cover (Dog River, Fowl River and Fish River/Weeks Bay) utilizing a watershed-ecosystem approach that incorporates both empirical data and modeling efforts.

Approach:

To examine nutrient loading dynamics, we are sampling 10 low and high order streams in each watershed approximately twice monthly and during peak freshwater discharge. These samples are analyzed for dissolved inorganic nitrogen (measured components are NO3, NO2, and NH4), dissolved organic nitrogen, particulate organic nitrogen, dissolved inorganic phosphorus (PO4), dissolved organic phosphorus, and particulate organic phosphorus. These measurements, in concert with gauged and modeled river flow rates applied to un-gauged portions of each watershed, are subsequently used to estimate nutrient loading rates (mmol/m3/d). The manner in which biogeochemical processes respond to nutrient loading is being determined during bimonthly collection of hydrographic data and water-column and sediment process measurements, including water-column primary production, sediment denitrification, sediment oxygen flux, and sediment dissolved inorganic nitrogen and phosphorus flux. Subsequently, sub-estuarine ecosystem response will be assessed by integrating these rate processes with estimates of water residence time and mixing, calculated from a 3-D hydrodynamic model implemented for each system.

Supplemental Keywords:

estuarine research, coastal ecosystem, human modifications, land and water use, watersheds, aquatic ecosystems, bay ecosystem, nutrients, land cover, nitrogen cycling. , Ecosystem Protection/Environmental Exposure & Risk, Water, Geographic Area, Scientific Discipline, RFA, Ecosystem/Assessment/Indicators, Gulf of Mexico, Restoration, Aquatic Ecosystem Restoration, Ecology, Aquatic Ecosystems & Estuarine Research, Ecological Risk Assessment, Aquatic Ecosystem, Chemistry, Ecological Indicators, Ecological Effects - Environmental Exposure & Risk, Ecosystem Protection, Ecology and Ecosystems, State, phosphorus, water quality, anthropogenic stresses, estuarine research, Fowl River, land use, wetlands, Alabama (AL), Dog River, watersheds, nitrogen cycling, aquatic ecosystems, coastal environments, nitrogen, coastal ecosystem, nutrient loading, land cover, Fish River/Weeks Bay, ecosystem, nutrients, anthropogenic stress, water use, bay ecosystem, Mobile Bay

Progress and Final Reports:
2000 Progress Report


Main Center Abstract and Reports:
R827072    Alabama Center For Estuarine Studies (ACES)

Subprojects under this Center: (EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
R827072C001 Fluorescent Whitening Agents As Facile Pollution Markers In Shellfishing Waters
R827072C002 Red Snapper Demographics on Artificial Reefs: The Effect of Nearest-Neighbor Dynamics
R827072C003 Stabilization of Eroding Shorelines in Estuarine Wave Eliminates with Constructed Fringe Wetlands Incorporating Offshore Breakwaters
R827072C004 Interaction Between Water Column Structure and Reproduction in Jellyfish Populations Of Mobile Bay (SGER)
R827072C005 Effects of Variation in River Discharge and Wind-Driven Resuspension on Higher Trophic Levels in the Mobile Bay Ecosystem
R827072C006 Results of Zooplankton Component
R827072C007 Benthic Study Component
R827072C008 A Preliminary Survey of Macroalgal and Aquatic Plant Distribution in the Mobile Tensaw Delta
R827072C009 Fisheries-induced changes in the structure and function of shallow water "nursery habitats": an experimental assessment
R827072C010 Effects Of Variation in River Discharge and Wind-Driven Resuspension on Lower Trophic Levels of the Mobile Bay Ecosystem
R827072C011 Evaluation of Alabama Estuaries as Developmental Habitat for Juvenile Sea Turtles
R827072C012 Effects of Salinity Stress on Natural and Anthropogenically-Derived Bacteria in Estuarine Environments
R827072C013 The Role of Land-Use/Land-Cover and Sub-estuarine Ecosystem Nitrogen Cycling in the Regulation of Nitrogen Delivery to a River Dominated Estuary; Mobile Bay, Alabama
R827072C014 Environmental Attitudes of Alabama Coastal Residents: Public Opinion Polls and Environmental Policy
R827072C015 Synthesis and Characterization of an Electrochemical Peptide Nucleic Acid Probe
R827072C016 Determinants of Small-Scale Variation in the Abundance of the Blue Crab Callinectes Sapidus
R827072C017 Effects of Estrogen Pollution on the Reproductive Fitness of the Gulf Pipefish, Syngnathus scovelli
R827072C019 A Model for Genetic Diversity Aquatic Insects of the Mobile/Tensaw River Delta
R827072C020 Evaluating Trophic Processes as Indicators of Anthropogenic Eutrophication in Coastal Ecosystems: An Exploratory Analysis
R827072C021 Effects of Anthropogenic Eutrophication on the Magnitude and Trophic Fate of Microphytobenthic Production in Estuaries
R827072C022 Characteristics of Ship Waves and Wind Waves in Mobile Bay
R827072C023 Methods Comparison Between Stripping Voltammetry and Plasma Emission Spectroscopy for Metals in Mobile Bay
R827072C024 Changes in Water Conditions and Sedimentation Rates Associated With Construction of the Mobile Bay Causeway
R827072C025 Cold-Induced Hibernation of Marine Vibrios in the Gulf of Mexico: A Study of Cell-Cell Communication and Dormancy in Vibrio vulnificus
R827072C026 Holocene Sedimentary History of Weeks Bay, AL: Human and Natural Impacts on Deposition in a Gulf Coast Estuary
R827072C027 Shelter Bottlenecks and Self-Regulation in Blue Crab Populations: Assessing the Roles of Nursery Habitats and Juvenile Interactions for Shelter Dependent Organisms
R827072C028 Predicting Seagrass Survival in Nutrient Enriched Waters: Toward a New View of an Existing Paradigm
R827072C029 DMSP and its Role as an Antioxidant in the Salt Marsh Macrophyte Spartina alterniflora
R827072C030 A Preliminary Survey of Aerial and Ground-Dwelling Insects of the Mobile/Tensaw Delta
R827072C031 Natural Biogeochemical Tags of Striped Mullet, Mugil cephalus, Estuarine Nursery Areas in the North Central Gulf of Mexico
R827072C032 Resolution of Sedimentation Rates in Impacted Coastal Environments Using 137Cs and 210Pb Markers: Dog River and Fowl River Embayments
R827072C033 Investigation of the Use of Pulse Amplitude Modulated (PAM) Fluorometry as an Indicator of Submerged Aquatic Vegetation Health in Mobile Bay
R827072C034 Influence of Invasive Plant Species in Determining Diversity of Aquatic Vegetation in the Mobile-Tensaw Delta
R827072C035 The Influence of Shallow Water Hydrodynamics on the Importance of Seagrass Detritus in Estuarine Food Webs
R827072C036 Food Web Interactions, Spatial Subsidies and the Flow of Energy Between the Mobile Bay Delta and Offshore Waters: A SGER Proposal to the Alabama Center for Estuarine Studies
R830651C001 Meteorological Modeling of Hurricanes and Coastal Interactions: A Stability Study For Vertical Pressure Levels
R830651C002 Characterization of Glycoprotein Cues Used by the Parasitic Rhizocephalan Barnacle Loxothylacus texanus To Identify Its Blue Crab Host, Callinectes sapidus
R830651C003 Survey of Diamondback Terrapin Populations in Alabama Estuaries
R830651C004 An Assessment of Environmental Contaminant Levels in Water and Dragonfly Larvae Tissues from the Mobile/Tensaw Delta

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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