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.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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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.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
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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.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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