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Artículo

High nutrient retention in chronically nutrient-rich lowland streams

García, Victoria JulietaIcon ; Gantes, Hilda Patricia; Giménez, Loreta; Hegoburu, CeciliaIcon ; Ferreiro, Nicolas AndresIcon ; Sabater, Francesc; Feijoó, Claudia Silvina
Fecha de publicación: 12/2016
Editorial: University of Chicago Press
Revista: Freshwater Science
ISSN: 2161-9549
e-ISSN: 2161-9565
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Biológicas

Resumen

Nutrient retention has been studied intensively in streams, but some mechanisms and processes are not yet entirely understood, especially in open-canopy streams. We evaluated PO43−, as soluble reactive P (SRP), and NH4+ uptake in 2 chronically enriched Pampean streams with different macrophytic abundance. We performed short-term nutrient additions to quantify SRP and NH4+ uptake metrics throughout the year, and we investigated which hydrological and biological factors influenced nutrient uptake. The results showed that SRP and NH4+ uptakes were high in relation to pristine and impaired streams elsewhere, and they did not saturate despite elevated background nutrient levels. NH4+ areal uptake rate fit in a 1st-order uptake model, but an exponential model described the relationship between SRP areal uptake rate and SRP concentration. Consistent with this finding, SRP uptake velocity tended to increase linearly, and SRP uptake length decreased linearly with SRP concentration. The analysis of factors influencing uptake metrics suggested that SRP uptake mainly depended on heterotrophic demand, whereas NH4+ uptake was enhanced under more autotrophic conditions. Our results showed that nutrient uptake metrics of enriched Pampean streams were similar to those observed in streams with low nutrient levels.
Palabras clave: Phosphate Uptake , Ammonium Uptake , Non-Saturation , Biogeochemistry , Metabolism , Macrophytes , Aquatic Biofilms
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/42916
URL: https://www.journals.uchicago.edu/doi/abs/10.1086/690598
DOI: http://dx.doi.org/10.1086/690598
Colecciones
Articulos(CADIC)
Articulos de CENTRO AUSTRAL DE INVESTIGACIONES CIENTIFICAS
Articulos(INIBIOMA)
Articulos de INST. DE INVEST.EN BIODIVERSIDAD Y MEDIOAMBIENTE
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
García, Victoria Julieta; Gantes, Hilda Patricia; Giménez, Loreta; Hegoburu, Cecilia; Ferreiro, Nicolas Andres; et al.; High nutrient retention in chronically nutrient-rich lowland streams; University of Chicago Press; Freshwater Science; 36; 1; 12-2016; 26-40
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