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Abstract:

We explored a benthic community living on stones in an acidic (pH ≤ 2) stream of active volcanic origin from Patagonia, Argentina, by combining in situ measurements (temperature, pH, conductivity, dissolved oxygen), photosynthesis of intact biofilms (measured with microsensors by the light-dark shift method), pure-culture experiments on isolated algae, and confocal laser scanning microscopy on the biofilms. The epilithon of the Agrio River was dominated (99% of total biomass) by one species: Gloeochrysis (Chrysophyceae). This species was observed as brown, mucilaginous, 200-μm-thick films on stones, growing in clumps in a dense matrix of fungal hyphae, bacteria, and inorganic particles held together by extracellular polymeric substances. Gloeochrysis was isolated and cultivated. The photosynthetic rate measured at saturation irradiance was 120 μmol oxygen (mg chlorophyll a)-1h-1 under laboratory conditions, and the saturation rate of photosynthesis by carbon dioxide was 90 μmol oxygen (mg chlorophyll a)-1 h-1 for oxygen evolution. Photosynthetic activity of the biofilm was light-dependent and saturated above 200 μmol photons m-2 s-1. In the dark, the stone surface became anoxic. Our data suggest that primary production in the Agrio River was not limited by light, carbon, or phosphorus but instead, nitrogen-limited. © Springer-Verlag 2004.

Registro:

Documento: Artículo
Título:Community structure and photosynthetic activity of epilithon from a highly acidic (pH ≤ 2) mountain stream in Patagonia, Argentina
Autor:Baffico, G.D.; Diaz, M.M.; Wenzel, M.T.; Koschorreck, M.; Schimmele, M.; Neu, T.R.; Pedrozo, F.
Filiación:Ctro. Reg. Universitario Bariloche, Universidad Nacional del Comahue, Quintral 1250, Río Negro, Argentina
Consejo Nac. de Invest. Cie. y Tec., Buenos Aires, Argentina
Depto. de Ciencias Biológicas, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Dept. of Inland Water Res. Magdeburg, UFZ Ctr. Environ. Res. Leipzig-Halle, Brückstrasse 3a, 39114 Magdeburg, Germany
IESGO, Moislingen 4, 21369 Nahrendorf, Germany
Palabras clave:Acidic stream; Gloeochrysis; Oxygen fluxes; pH; Photosynthetic rate; fresh water; Argentina; article; biofilm; Chrysophyta; confocal microscopy; ecosystem; isolation and purification; metabolism; microbiology; pH; photosynthesis; Algae, Golden-Brown; Argentina; Biofilms; Ecosystem; Fresh Water; Hydrogen-Ion Concentration; Microscopy, Confocal; Photosynthesis; algae; Bacteria (microorganisms); Chrysophyceae; Epilithon; Fungi
Año:2004
Volumen:8
Número:6
Página de inicio:463
Página de fin:473
DOI: http://dx.doi.org/10.1007/s00792-004-0408-1
Título revista:Extremophiles
Título revista abreviado:Extremophiles
ISSN:14310651
CODEN:EXTRF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14310651_v8_n6_p463_Baffico

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Citas:

---------- APA ----------
Baffico, G.D., Diaz, M.M., Wenzel, M.T., Koschorreck, M., Schimmele, M., Neu, T.R. & Pedrozo, F. (2004) . Community structure and photosynthetic activity of epilithon from a highly acidic (pH ≤ 2) mountain stream in Patagonia, Argentina. Extremophiles, 8(6), 463-473.
http://dx.doi.org/10.1007/s00792-004-0408-1
---------- CHICAGO ----------
Baffico, G.D., Diaz, M.M., Wenzel, M.T., Koschorreck, M., Schimmele, M., Neu, T.R., et al. "Community structure and photosynthetic activity of epilithon from a highly acidic (pH ≤ 2) mountain stream in Patagonia, Argentina" . Extremophiles 8, no. 6 (2004) : 463-473.
http://dx.doi.org/10.1007/s00792-004-0408-1
---------- MLA ----------
Baffico, G.D., Diaz, M.M., Wenzel, M.T., Koschorreck, M., Schimmele, M., Neu, T.R., et al. "Community structure and photosynthetic activity of epilithon from a highly acidic (pH ≤ 2) mountain stream in Patagonia, Argentina" . Extremophiles, vol. 8, no. 6, 2004, pp. 463-473.
http://dx.doi.org/10.1007/s00792-004-0408-1
---------- VANCOUVER ----------
Baffico, G.D., Diaz, M.M., Wenzel, M.T., Koschorreck, M., Schimmele, M., Neu, T.R., et al. Community structure and photosynthetic activity of epilithon from a highly acidic (pH ≤ 2) mountain stream in Patagonia, Argentina. Extremophiles. 2004;8(6):463-473.
http://dx.doi.org/10.1007/s00792-004-0408-1