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Abstract:

Pingüinera Stream is one of the two main lotic environments of Cierva Point (Antarctic Specially Protected Area No. 134) on the Danco Coast, Antarctic Peninsula. It originates in a large snowfield, flows through a penguin rookery, moss and grass banks, discharging into Cierva Cove. During late Antarctic summer 2003, we sampled the stream at six locations along its course. Abiotic features characterize it as a clear water system, yet receiving a very high amount of PO4-P and NH4-N from the rookery. These nutrients decrease downstream mainly due to uptake by epilithic algae and oxidation of NH4 + to NO3 -, consequently lowering pH and dissolved O2, which was always under-saturated. Strong correlations between all these parameters support these findings. The epilithic algal community shows both temporal and spatial changes in biomass, composition and relative frequencies. Dominant species at the higher reach of the stream are cyanobacteria, mainly Chamaesiphon subglobosus (Rostafinski) Lemm. and a mesh of Leptolyngbya spp. filaments. The chlorophyta Prasiola calophylla (Carmich.) Menegh. dominates the community in oxygenated, fast-flowing reaches. Comparison with the other main stream from Cierva Point, which is not influenced by the rookery, shows that growth and survival of the epilithic community in this area is limited by factors other than nutrient concentrations. © Antarctic Science Ltd.

Registro:

Documento: Artículo
Título:Abiotic characterization and epilithic communities of a naturally enriched stream at Cierva Point, Antarctic Peninsula
Autor:Mataloni, G.; Vinocur, A.; De Tezanos Pinto, P.
Filiación:Depto. de Ecología, Genética Y Evolución, Facultad de Cs. Exactas Y Naturales, Pab. II - Ciudad Universitaria - C 1428 EHA, Buenos Aires, Argentina
Palabras clave:Antarctic streams; Ecology; Epilithon; Freshwater algae; Nutrients; Taxonomic composition; arctic environment; community structure; freshwater ecosystem; Antarctic Peninsula; Antarctica; Arctic and Antarctic; West Antarctica; World; algae; Bryophyta; Chamaesiphon subglobosus; Chlorophyta; Cyanobacteria; Cyanobacterium (genus); Leptolyngbya; Prasiola calophylla; Spheniscidae
Año:2005
Volumen:17
Número:2
Página de inicio:163
Página de fin:170
DOI: http://dx.doi.org/10.1017/S0954102005002579
Título revista:Antarctic Science
Título revista abreviado:Antarct. Sci.
ISSN:09541020
CODEN:ANTSE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v17_n2_p163_Mataloni

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Citas:

---------- APA ----------
Mataloni, G., Vinocur, A. & De Tezanos Pinto, P. (2005) . Abiotic characterization and epilithic communities of a naturally enriched stream at Cierva Point, Antarctic Peninsula. Antarctic Science, 17(2), 163-170.
http://dx.doi.org/10.1017/S0954102005002579
---------- CHICAGO ----------
Mataloni, G., Vinocur, A., De Tezanos Pinto, P. "Abiotic characterization and epilithic communities of a naturally enriched stream at Cierva Point, Antarctic Peninsula" . Antarctic Science 17, no. 2 (2005) : 163-170.
http://dx.doi.org/10.1017/S0954102005002579
---------- MLA ----------
Mataloni, G., Vinocur, A., De Tezanos Pinto, P. "Abiotic characterization and epilithic communities of a naturally enriched stream at Cierva Point, Antarctic Peninsula" . Antarctic Science, vol. 17, no. 2, 2005, pp. 163-170.
http://dx.doi.org/10.1017/S0954102005002579
---------- VANCOUVER ----------
Mataloni, G., Vinocur, A., De Tezanos Pinto, P. Abiotic characterization and epilithic communities of a naturally enriched stream at Cierva Point, Antarctic Peninsula. Antarct. Sci. 2005;17(2):163-170.
http://dx.doi.org/10.1017/S0954102005002579