Effects of nutrient loading on the carbon balance of coastal wetland sediments

Article Abstract:

Nutrient loading effects on coastal wetland sediment carbon balance have been studied over 12 years in an oligotrophic South Carolina salt marsh. It was found that soil respiration went up and carbon inventories went down in sediments fertilized with phosphorus and nitrogen. Fertilized areas turned into net sources of atmospheric carbon. Sediment respiration goes on in the plots at an accelerated rate. Greater soil respiration in fertilized plots was largely the result of an increase in primary production. A net loss of carbon can be the result of nutrient loading of oligotrophic wetlands.

South Carolina

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Seasonal variation in the regulation of phytoplankton by nitrogen and grazing in a salt-marsh estuary

Article Abstract:

Grazing by microzooplankton significantly limits phytoplankton population growth in the summer bloom when nanoflagellates are prevalent at a tidally dominated salt-marsh estuary near Georgetown, SC. In the winter, however, nutrient supply is the limiting factor in the diatom-dominated community. Addition of NH4+ resulted in significant increase in growth of phytoplankton groups and total chlorophyll in the winter but not in the summer. Dilution to reduce pressure from microzooplankton grazing affected growth more in the summer than in the winter.

Water, Nitrogen (Chemical element), Water chemistry, Phytoplankton, Estuarine ecology, Estuarine ecosystems

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Chemoreception in a marine cryptophyte: behavioral plasticity in response to amino acids and nitrate

Article Abstract:

Chemoreception in a marine cryptophyte is discussed relative to behavioral plasticity in response to nitrate and amino acids. Computer-assisted video motion analysis was used to study behavioral responses in Chroomonas sp. Rates at which glycine-grown cells stopped and turned were significantly reduced in response to glutamate, alanine, methionine, and aspartate. Chemoreception does exist in cryptophyte species and appears to be adaptive.

United States, Statistical Data Included, Usage, Behavior, Marine bacteria, Chemoreceptors, Amino acids, Chemical ecology

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