NDLI: Seasonal Water Column NH4 + Cycling Along a Semi-arid Sub-tropical River–Estuary Continuum: Responses to Episodic Events and Drought Conditions

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Seasonal Water Column NH4 + Cycling Along a Semi-arid Sub-tropical River–Estuary Continuum: Responses to Episodic Events and Drought Conditions

Content Provider	Springer Nature Link
Author	Bruesewitz, Denise A. Gardner, Wayne S. Mooney, Rae F. Buskey, Edward J.
Copyright Year	2015
Abstract	River–estuary continuums represent a dynamic range of environmental conditions in aquatic ecosystems, providing an ideal gradient for understanding changes in nitrogen (N) cycling. We measured rates of ammonium (NH4 +) cycling, including uptake and regeneration, in the water column of upper river, lower river, and estuary sites. This 1-year study encompassed periods of flood and drought, in a coastal catchment of south Texas. Low NH4 + concentrations and frequently balanced net NH4 + fluxes suggest minimal N cycling, but these measurements alone did not reveal the patterns of water column NH4 + uptake and regeneration in the river and estuarine systems. Rapid turnover of NH4 + supported productive estuaries, particularly during periods of droughts when riverine sources of NH4 + were minimal. However, NH4 + demand declined during storms across the river–estuary continuum, and regeneration rates were high, especially in the rivers. Most research in rivers has focused on benthic or whole-system dynamics, but our data demonstrate that active NH4 + cycling also occurs in isolated river water columns. Lower river sites were hotspots of NH4 + cycling on the landscape. Continued studies across river–estuary continuums are needed to enhance our understanding of aquatic systems and improve our ability to manage nutrients in the face of increased anthropogenic pressures and a changing climate.
Starting Page	792
Ending Page	812
Page Count	21
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	18
Issue Number	5
e-ISSN	14350629
Language	English
Publisher	Springer US
Publisher Date	2015-03-18
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	freshwater-marine isotope dilution nitrogen uptake regeneration ammonium demand National Estuarine Research Reserve Ecology Plant Sciences Zoology Environmental Management Geoecology/Natural Processes Hydrology/Water Resources
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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