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Details

Autor(en) / Beteiligte
Titel
Seasonal Water Column NH.sub.4.sup.+ Cycling Along a Semi-arid Sub-tropical River-Estuary Continuum: Responses to Episodic Events and Drought Conditions
Ist Teil von
  • Ecosystems (New York), 2015-08, Vol.18 (5), p.792
Ort / Verlag
Springer
Erscheinungsjahr
2015
Link zum Volltext
Quelle
SpringerLink
Beschreibungen/Notizen
  • 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 (NH.sub.4.sup.+) 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 NH.sub.4.sup.+ concentrations and frequently balanced net NH.sub.4.sup.+ fluxes suggest minimal N cycling, but these measurements alone did not reveal the patterns of water column NH.sub.4.sup.+ uptake and regeneration in the river and estuarine systems. Rapid turnover of NH.sub.4.sup.+ supported productive estuaries, particularly during periods of droughts when riverine sources of NH.sub.4.sup.+ were minimal. However, NH.sub.4.sup.+ 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 NH.sub.4.sup.+ cycling also occurs in isolated river water columns. Lower river sites were hotspots of NH.sub.4.sup.+ 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.
Sprache
Englisch
Identifikatoren
ISSN: 1432-9840
eISSN: 1435-0629
DOI: 10.1007/s10021-015-9863-z
Titel-ID: cdi_gale_infotracacademiconefile_A713731025
Format
Schlagworte
Estuaries

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