Sediment-water oxygen, ammonium and soluble reactive phosphorus fluxes in a turbid freshwater estuary (Curonian lagoon, Lithuania): evidences of benthic microalgal activity

Benthic algae control sediment–water column fluxes of organic and inorganic nitrogen compounds in a temperate lagoon

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 ...

Prediction of runoff and sediment from agricultural watersheds by a mathematical model. 3 sediment -bound and soluble phosphorus loadings.

Benthic iron and phosphorus fluxes across the Peruvian oxygen minimum zone

Benthic fluxes of dissolved ferrous iron (Fe2+) and phosphate (TPO4) were quantified by in situ benthic chamber incubations and pore-water profiles along a depth transect (11uS, 80–1000 m) across the Peruvian oxygen minimum zone (OMZ). Bottom-water O2 levels were , 2 mmol L21 down to 500-m water depth, and increased to , 40 mmol L21 at 1000 m. Fe2+ fluxes were highest on the shallow shelf (maxi...

Microbial mediation of ‘reactive’ nitrogen transformations in a temperate lagoon

Coastal lagoons positioned along the land margin may play an important role in removing or transforming ‘reactive’ nitrogen during its transport from land to the ocean. Hog Island Bay is a shallow, coastal lagoon located on the ocean-side of the Delmarva Peninsula in Virginia (USA). External nitrogen inputs are derived primarily from agriculturally enriched groundwater, and these support, in pa...

Seasonal variability in water chemistry and sediment characteristics of intertidal zone at Karnafully estuary, Bangladesh

The Karnafully is one of the most important rivers due to its profound influence on water chemistry and sediment characteristics. The present study intended to assess the quality of water and sediment from intertidal zone of this river in respect to the pollution index. Seasonal water and sediment samples were collected during four seasons (Monsoon, post-monsoon, winter, and pre-monsoon) of 201...