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Title of Journal: Estuaries and Coasts

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Abbravation: Estuaries and Coasts

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Springer-Verlag

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DOI

10.1007/s00701-005-0565-8

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1559-2731

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Organic Matter Sources Supporting Lower Food Web P

Authors: Joel C Hoffman Deborah A Bronk John E Olney
Publish Date: 2008/08/01
Volume: 31, Issue: 5, Pages: 898-911
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Abstract

The Mattaponi River is part of the York River estuary in Chesapeake Bay Our objective was to identify the organic matter OM sources fueling the lower food web in the tidal freshwater and oligohaline portions of the Mattaponi using the stable isotopes of carbon C and nitrogen N Over 3 years 2002–2004 we measured zooplankton densities and C and N stable isotope ratios during the spring zooplankton bloom The river was characterized by a May–June zooplankton bloom numerically dominated by the calanoid copepod Eurytemora affinis and cladocera Bosmina freyi Cluster analysis of the stable isotope data identified four distinct signatures within the lower food web freshwater riverine brackish water benthic and terrestrial The stable isotope signatures of pelagic zooplankton including E affinis and B freyi were consistent with reliance on a mix of autochthonous and allochthonous OM including OM derived from vascular plants and humicrich sediments whereas macroinvertebrates consistently utilized allochthonous OM Based on a dualisotope mixing model reliance on autochthonous OM by pelagic zooplankton ranged from 20 to 95 of production declining exponentially with increasing river discharge The results imply that discharge plays an important role in regulating the energy sources utilized by pelagic zooplankton in the upper estuary We hypothesize that this is so because during high discharge particulate organic C loading to the upper estuary increased and phytoplankton biomass decreased thereby decreasing phytoplankton availability to the food webWe thank Deborah Steinberg Michael Sierszen John Morrice and two anonymous reviewers for helpful comments on the manuscript Brian Watkins Patricia Crewe Kristen Delano Ashleigh Rhea and Demetria Christo for field assistance and Demetria Christo Melanie Chattin and David Harris for preparation and analysis of stable isotope samples This work was supported by a National Science Foundation Graduate Research Fellowship to J C Hoffman and sponsored in part by NOAA Office of Sea Grant US Department of Commerce under Grant NA03OAR4170084 to the Virginia Graduate Marine Science Consortium and Virginia Sea Grant College Program with additional support from the Wallop–Breaux program of the US Fish and Wildlife Service through the Marine Recreational Fishing Advisory Board of the Virginia Marine Resources Commission Grants F116R6 and 7 This is contribution of the Virginia Institute of Marine Science The College of William and Mary

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Other Papers In This Journal:
  1. Activity, Abundance, and Diversity of Nitrifying Archaea and Denitrifying Bacteria in Sediments of a Subtropical Estuary: Bahía del Tóbari, Mexico
  2. Watershed Controls on the Geomorphology of Small Coastal Lagoons in an Active Tectonic Environment
  3. Estimates of Natural Salinity and Hydrology in a Subtropical Estuarine Ecosystem: Implications for Greater Everglades Restoration
  4. Recruitment of Estuarine-Dependent Nekton Through a New Tidal Inlet: the Opening of Packery Channel in Corpus Christi, TX, USA
  5. Nutrients and Abiotic Stress Interact to Control Ergot Plant Disease in a SW Atlantic Salt Marsh
  6. Trophic Consistency of Benthic Invertebrates Among Diversified Vegetational Habitats in a Temperate Coastal Wetland of Korea as Determined by Stable Isotopes
  7. The Legacy of Agricultural Reclamation on Channel and Pool Networks of Bay of Fundy Salt Marshes
  8. Nursery Habitat Shifts in an Estuarine Ecosystem : Patterns of Use by Sympatric Catfish Species
  9. Nematode Responses to the Invasion of Exotic Spartina in Mangrove Wetlands in Southern China
  10. Influence of Environmental Variables and Fishing Pressure on Bivalve Fisheries in an Inshore Lagoon and Adjacent Nearshore Coastal Area
  11. Impacts of SW Monsoon on Phytoplankton Community Structure Along the Western Coastal BOB: an HPLC Approach
  12. Deterioration of Sediment Quality in Seagrass Meadows ( Posidonia oceanica ) Invaded by Macroalgae ( Caulerpa sp.)
  13. Identification of Winter Flounder ( Pseudopleuronectes americanus ) Estuarine Spawning Habitat and Factors Influencing Egg and Larval Distributions
  14. A Model Study of the Estuarine Turbidity Maximum along the Main Channel of the Upper Chesapeake Bay
  15. Temperature Dependence of Oxygen Dynamics and Community Metabolism in a Shallow Mediterranean Macroalgal Meadow ( Caulerpa prolifera )
  16. Subtidal Eelgrass Declines in the Great Bay Estuary, New Hampshire and Maine, USA
  17. Response of an Arctic Sediment Nitrogen Cycling Community to Increased CO 2
  18. The American Crocodile in Biscayne Bay, Florida
  19. Partial Migration Across Populations of White Perch ( Morone americana ): A Flexible Life History Strategy in a Variable Estuarine Environment
  20. A Paleoecological History of the Late Precolonial and Postcolonial Mesohaline Chesapeake Bay Food Web
  21. Satellite Estimates of Wide-Range Suspended Sediment Concentrations in Changjiang (Yangtze) Estuary Using MERIS Data
  22. Environmental Risk Evaluation System—an Approach to Ranking Risk of Ocean Energy Development on Coastal and Estuarine Environments
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