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Full-Text Articles in Physical Sciences and Mathematics
Benthic Algae Control Sediment-Water Column Fluxes Of Organic And Inorganic Nitrogen Compounds In A Temperate Lagoon, Ac Tyler, Kj Mcglathery, Iris C. Anderson
Benthic Algae Control Sediment-Water Column Fluxes Of Organic And Inorganic Nitrogen Compounds In A Temperate Lagoon, Ac Tyler, Kj Mcglathery, Iris C. Anderson
VIMS Articles
Coastal lagoons are a common land-margin feature worldwide and function as an important filter for nutrients entering from the watershed. The shallow nature of lagoons leads to dominance by benthic autotrophs, which can regulate benthic-pelagic coupling. Here we demonstrate that both microalgae and macroalgae are important in controlling dissolved inorganic as well as organic nitrogen (DIN and DON) fluxes between the sediments and the water column. Fluxes of nitrogen (NH4+, NO3-, DON, urea, and dissolved free and combined amino acids [DFAA, DCAA]) and O-2 were measured from October 1998 through August 1999 in sediment cores collected from Hog Island Bay, …
Climatic Warming And Accompanying Changes In The Ecological Regime Of The Black Sea During 1990s, T Oguz, T Cokacar, P Malanotte-Rizzoli, Hw Ducklow
Climatic Warming And Accompanying Changes In The Ecological Regime Of The Black Sea During 1990s, T Oguz, T Cokacar, P Malanotte-Rizzoli, Hw Ducklow
VIMS Articles
The Black Sea ecosystem is shown to experience abrupt shifts in its all trophic levels from primary producers to apex predators in 1995 - 1996. It arises as a manifestation of concurrent changes in its physical climate introduced by intensive warming of its surface waters as well as abrupt increases in the mean sea level and the net annual mean fresh water flux. The warming is evident in the annual-mean sea surface temperature (SST) data by a continuous rise at a rate of similar to 0.25 degreesC per year, following a strong cooling phase in 1991 - 1993. The most …
Bacterioplankton Distribution And Production In The Bathypelagic Ocean: Directly Coupled To Particulate Organic Carbon Export?, Da Hansell, Hw Ducklow
Bacterioplankton Distribution And Production In The Bathypelagic Ocean: Directly Coupled To Particulate Organic Carbon Export?, Da Hansell, Hw Ducklow
VIMS Articles
A recently published evaluation of bacterioplankton abundance and productivity in the bathypelagic North Pacific suggests that these properties are generally coupled with particulate organic carbon (POC) fluxes. In that analysis, bacterial biomass and productivity were several-fold greater in subarctic than subtropical waters, consistent with the basin-scale distribution of POC flux and suggestive of a sinking POC --> DOC --> bacteria transformation of the carbon. To test this hypothesis, we sought to determine whether the very strong spatial and temporal gradients in POC flux in the Arabian Sea would force similar deep-ocean gradients in bacterial variables. On both a within and …
Transport Of Dissolved Inorganic Carbon From A Tidal Freshwater Marsh To The York River Estuary, Sc Neubauer, Iris C. Anderson
Transport Of Dissolved Inorganic Carbon From A Tidal Freshwater Marsh To The York River Estuary, Sc Neubauer, Iris C. Anderson
VIMS Articles
The cycling of dissolved inorganic carbon (DIC) and the role of tidal marshes in estuarine DIC dynamics were studied in a Virginia tidal freshwater marsh and adjacent estuary. DIC was measured over diurnal cycles in different seasons in a marsh tidal creek and at the junction of the creek with the adjacent Pamunkey River. In the creek, DIC concentrations around high tide were controlled by the same processes affecting whole-estuary DIC gradients. Near low tide, DIC concentrations were 1.5-5-fold enriched relative to high tide concentrations, indicating an input of DIC from the marsh. Similar patterns (although dampened in magnitude) were …