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Abstract:

Kroner Lake, located at Deception Island (Maritime Antarctica), is a unique geothermally heated lagoon in Antarctica. It is declared as special site of scientific interest (SSSI) by Scientific Committee for Antarctic Research (SCAR) for its high biodiversity. A sharp environmental heterogeneity is registered in this lagoon, due to its connection to the sea in its southern margin, and to the input of warm freshwater in the northern one (because of hot springs). This study analyses the biodiversity and abundance of the algal communities (phytoplankton and benthic assemblages) and their relationship with environmental factors. In particular, strong spatial differences of both temperature and conductivity were recorded. The biological studies revealed that the phytoplankton (nanoplankton and microplankton) was dominated by marine diatom species, while the pico-sized fraction was composed by Cyanobacteria Synechococcus-like cells. The epipelon was mainly represented by chain and tubicolous diatoms, among which, Melosira nummuloides was one of the most abundant species. Filamentous Cyanobacteria were also frequently recorded in the algal mats. Kroner Lake is subject to a strong marine influence. Phytoplankton is absolutely dominated by marine diatoms. Spatial variations in temperature and conductivity recorded in the lagoon influence the distribution of the aquatic communities. The greater abundance of pico-sized cells coincided with the warmest site of the water body. Regarding the benthic community, the contribution of freshwater and brackish species is comparatively more important than for the phytoplankton, although the high contribution of marine-derived algae was also evident. © Springer-Verlag 2005.

Registro:

Documento: Artículo
Título:Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)
Autor:Izaguirre, I.; Allende, L.; Tell, G.
Filiación:Departamento Ecología, Genética Y Evolución, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Buenos Aires, Argentina
Palabras clave:Algal mats; Antarctica; Deception Island; Lagoon; Phytoplankton; algal community; algal mat; environmental factor; phytoplankton; relative abundance; species diversity; thermal water; Antarctica; Deception Island; Kroner Lake; South Shetland Islands; algae; Bacillariophyta; Cyanobacteria; Melosira nummuloides; Nitzschia alba; Synechococcus
Año:2006
Volumen:29
Número:5
Página de inicio:364
Página de fin:371
DOI: http://dx.doi.org/10.1007/s00300-005-0065-6
Título revista:Polar Biology
Título revista abreviado:Polar Biol.
ISSN:07224060
CODEN:POBID
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v29_n5_p364_Izaguirre

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Citas:

---------- APA ----------
Izaguirre, I., Allende, L. & Tell, G. (2006) . Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands). Polar Biology, 29(5), 364-371.
http://dx.doi.org/10.1007/s00300-005-0065-6
---------- CHICAGO ----------
Izaguirre, I., Allende, L., Tell, G. "Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)" . Polar Biology 29, no. 5 (2006) : 364-371.
http://dx.doi.org/10.1007/s00300-005-0065-6
---------- MLA ----------
Izaguirre, I., Allende, L., Tell, G. "Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)" . Polar Biology, vol. 29, no. 5, 2006, pp. 364-371.
http://dx.doi.org/10.1007/s00300-005-0065-6
---------- VANCOUVER ----------
Izaguirre, I., Allende, L., Tell, G. Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands). Polar Biol. 2006;29(5):364-371.
http://dx.doi.org/10.1007/s00300-005-0065-6