Estimation of ecosystem metabolism from diel oxygen technique in a saline shallow lake: La Salada (Argentina)

Autores

Alfonso, M.B., Vitale, A.J., Menéndez, M.C., Perillo, V.L., Piccolo, M.C. and Perillo, G.M.E.

Publicado en

Hydrobiologia, v. 752(1):223-237

Año de publicación

2015

Afiliaciones

•Proyecto redes CONICET Pampa, Buenos Aires, Argentina,
•Instituto Argentino de Oceanografía (IADO – CONICET), Camino a la Carrindanga km 7, 8000, Bahía Blanca, Argentina
•Proyecto redes CONICET Pampa, Buenos Aires, Argentina,
•Instituto Argentino de Oceanografía (IADO – CONICET), Camino a la Carrindanga km 7, 8000, Bahía Blanca, Argentina,
•Departamento de Ingeniería Eléctrica y Computadoras, Universidad Nacional del Sur (UNS), Av. Alem 1253, 8000, Bahía Blanca, Argentina
•Proyecto redes CONICET Pampa, Buenos Aires, Argentina
•Instituto Argentino de Oceanografía (IADO – CONICET), Camino a la Carrindanga km 7, 8000, Bahía Blanca, Argentina
•Instituto de Investigaciones Bioquímicas de Bahía Blanca (INIBIBB-CONICET), Camino a la Carrindanga km 7, 8000, Bahía Blanca, Argentina
•Proyecto redes CONICET Pampa, Buenos Aires, Argentina,
•Instituto Argentino de Oceanografía (IADO – CONICET), Camino a la Carrindanga km 7, 8000, Bahía Blanca, Argentina,
•Departamento de Geografía y Turismo, Universidad Nacional del Sur, 12 de Octubre y San Juan, 8000, Bahía Blanca, Argentina
•Proyecto redes CONICET Pampa, Buenos Aires, Argentina,
•Instituto Argentino de Oceanografía (IADO – CONICET), Camino a la Carrindanga km 7, 8000, Bahía Blanca, Argentina,
•Departamento de Geología, Universidad Nacional del Sur, San Juan 670, 8000, Bahía Blanca, Argentina

Programa

CRN3

Proyecto

CRN3038

Keywords

Shallow lake, Lake metabolism, Salinelake, time series

DOI

https://doi.org/10.1007/s10750-014-2092-1
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Resumen

Studies based on continuous monitoring of diel changes in dissolved oxygen concentration allow the estimation of ecosystem metabolism and provide a measure of the overall trophic processes of an ecosystem. In this study, net ecosystem production (NEP), community/ecosystem respiration (R), and gross primary production (GPP) rates were estimated in relation to physicochemical and climatic variables for 18 months in La Salada, a saline shallow lake. Net autotrophic conditions prevailed during the study period (NEP: 64.05 ± 44.22 mmol O2 m-2 day-1). GPP and R were positively correlated and were synchronized on a daily timescale, with GPP typically greater than R. Principal component analysis revealed that monthly rates of GPP, R, and NEP responded, as expected, to temperature and light seasonal patterns. Water level and conductivity fluctuations, because of evapoconcentration and water management, were relevant as a driver of the physicochemical and biological characteristics of the lake. In saline lakes as La Salada, an adequate management of water resources will be relevant to maintain the ecosystem equilibrium and the quality of its resources.