Linking nitrogen in estuarine producers to land-derived sources

Article Abstract:

A strong connection has been shown between nitrogen (N) used by primary producers in estuaries and increased N in coastal watersheds. Stable isotope ratios of N in groundwater were compared with those from producers from the Waquoit Bay watershed-estuary system in Cape Cod, Massachusetts. Increases in wastewater contributions to the N pool were associated with increases in delta-15 N values of groundwater nitrite within the watershed and an increase in average delta-15 N of dissolved inorganic nitrogen received by the estuaries. Delta-15 N also increased in eelgrass, microalgae, cordgrass and suspended particulate organic matter.

Massachusetts, Eutrophication

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Oxic/anoxic oscillations and organic carbon mineralization in an estuarine maximum turbidity zone (The Gironde, France)

Article Abstract:

Organic carbon mineralization and oxic/anoxic oscillations in an estuarine maximum turbidity zone, The Gironde Estuary, France, are discussed. Most sediment went though oxic/anoxic oscillations in the neap-spring cycle. Accumulation of labile-dissolved organic carbon seen in the fluid mud seems to indicate that oscillations bring on an acceleration of particulate organic matter (POM) decomposition, and in the maximum turbidity zone a net loss of refractory land-derived POM occurs. The system acts as an efficient oxic/suboxic fluidized bed reactor somewhat as mobile deltaic muds do.

France, Belgium, Statistical Data Included, Gases, Marine sediments, Biomineralization, Tides, Coastal ecology, Carbon cycle (Biogeochemistry), Carbon cycle, Dissolved oxygen, Mud, Mud (Sediment)

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Excretory products of mobile epifauna as a nitrogen source for seaweeds

Article Abstract:

Excretory products of mobile epifauna could provide up to 79% of the nitrogen needed by seaweeds. In a study of the fucalean alga Carpophyllum plumosum var. capillifolium at Matheson Bay, in northeastern New Zealand, the epifauna excreted about 1.5-2.1 times the nitrogen on average as was used by the plants. The water turnover rate was also compared to the uptake rate of ammonium.

New Zealand, Marine fauna, Marine animals, Marine algae

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