Accession Number : ADP007787

Title :   Seasonal Variations in Sediment-Water Nutrient Exchanges in Estuarine Systems,

Corporate Author : RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY

Personal Author(s) : Farris, C. N.

Report Date : JUN 1992

Pagination or Media Count : 6

Abstract : Nutrient fluxes across the sediment-water interface have been a topic of much investigation in many nearshore studies (e.g. Fisher, Carlson, and Barber 1982; Keizer, Hargrove, and Cordon 1989). These fluxes are thought to be an important seasonal component of nutrient cycles in coastal and estuarine waters (Asmus, Asmus, and Reise 1986; Bodungen 1986; Van Klump and Martens 1989). Additionally, these fluxes may be associated with significant changes in the structure and development stage of the benthic community (Rhoads 1974). Finally, these nutrient fluxes can be strongly influenced by natural and anthropogenic changes in the physical environment. These fluxes can be associated with changes in the nutrient and organic loading in the water column and the benthic habitat. Thus, the pattern of flux rate variations in the benthos is directly related to the dissolved and nutrient species in the overlying water column, which also reveals clear seasonal trends (Pilson 1985). In estuaries, there are two broad categories of dissolved chemical species. Those whose concentration is determined only by the contributing proportions of riverine and offshore water are conservative in character; an example is the chlorinity of natural waters. Those species whose concentration is determined by chemical or biotic interactions and transformations are nonconservative in character; an example would be in oxygen or phosphate concentration. Frequently, the interaction of the benthos with the water column determines the type of non-conservative behavior of the nutrient.

Descriptors :   *ESTUARIES, *NUTRIENTS, *SEDIMENTS, *SEASONAL VARIATIONS, BEHAVIOR, CHEMICALS, CYCLES, ENVIRONMENTS, HABITATS, INTERACTIONS, INTERFACES, OFFSHORE, OXYGEN, PATTERNS, PHOSPHATES, RATES, STRUCTURES, TRANSFORMATIONS, VARIATIONS, WATER, SYMPOSIA, FLUX(RATE).

Subject Categories : Geology, Geochemistry and Mineralogy
      Biological Oceanography
      Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE