Oxygen and carbon dioxide mass balance for the estuarine-intertidal marsh complex of five rivers in the southeastern U.S

Article Abstract:

Dissolved oxygen concentrations, pCO(sub.2) values, and respiratory rates in five estuaries of the southeastern US were measured in 10/95 and 7/96 to study the oxygen/carbon dioxide mass balance for the estuarine-intertidal marsh complex for five southeastern U.S. rivers. The water/atmosphere gas exchange in the estuaries was also of interest. Respiratory activity was found in the sediments and overlying water of the marshes during high tide to leave a signal that funnels back to the estuary during ebb tide. The signal can account for the estuarine gas concentrations and fluxes. The intertidal marshes of the area send considerable inorganic respiratory material to the estuaries. Outwelling of organic matter to estuaries is minor by comparison. Dissolved inorganic carbon (DIC) going to the coastal ocean is a small part of the total gas mass flow among marsh, estuary and atmosphere.

Oxygen, Southern States, Eutrophication, Marsh ecology

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Non-indigenous species as stressors in estuarine and marine communities: assessing invasion impacts and interactions

Article Abstract:

Invasion impacts and interactions have been assessed in non-indigenous species (NISs) in the Chesapeake Bay region. In marine and estuarine communities NISs may act as stressors and available data on their roles have been evaluated with interactions with anthropogenic stressors of various kinds assessed. Reported ecological impacts of 196 species that are known invaders or of uncertain origin in tidal waters of the bay have been reviewed, and impacts for the same 54 species of plants and fish from the group that regularly occur in the region are compared. Evidence for interaction in distribution or performance of the 54 plant and fish species within the bay and other stressors is discussed. NIS-stressor interactions likely have an important role in pattern and impact of invasions.

Human beings, Chesapeake Bay, Records and correspondence, Humans, Oceanography, Pest introduction, Animal introduction, Plant introduction

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The chemistry, fluxes, and sources of carbon dioxide in the estuarine waters of the Satilla and Altamaha Rivers, Georgia

Article Abstract:

The Satilla and Altamaha Rivers of Georgia, which both discharge into the South Atlantic Bight (SAB), have significant differences in pH, dissolved inorganic carbon (DIC), and alkalinity (Alk), which must reflect differences in the rivers' material inputs. The early stage of mixing is marked by dramatic pH increases, since the river water has low buffering capacity. The calculated pCO2 values and CO2 fluxes to the atmosphere are very high in areas with low salinity, with groundwater and tidal marshes as the mostly likely sources of waters high in pCO2.

Georgia, Rivers, Water chemistry

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