Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)

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 r...

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Detalles Bibliográficos
Autores principales: Izaguirre, I., Allende, L., Tell, G.
Formato: JOUR
Materias:
Algal mats
Antarctica
Deception Island
Lagoon
Phytoplankton
algal community
algal mat
environmental factor
phytoplankton
relative abundance
species diversity
thermal water
Kroner Lake
South Shetland Islands
algae
Bacillariophyta
Cyanobacteria
Melosira nummuloides
Nitzschia alba
Synechococcus
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07224060_v29_n5_p364_Izaguirre
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07224060_v29_n5_p364_Izaguirre
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spelling todo:paper_07224060_v29_n5_p364_Izaguirre2023-10-03T15:37:02Z Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands) Izaguirre, I. Allende, L. Tell, G. 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 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. Fil:Izaguirre, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Allende, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07224060_v29_n5_p364_Izaguirre
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
Izaguirre, I.
Allende, L.
Tell, G.
Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)
topic_facet 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
description 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.
format JOUR
author Izaguirre, I.
Allende, L.
Tell, G.
author_facet Izaguirre, I.
Allende, L.
Tell, G.
author_sort Izaguirre, I.
title Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)
title_short Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)
title_full Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)
title_fullStr Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)
title_full_unstemmed Algal communities of a geothermally heated lagoon on Deception Island (South Shetland Islands)
title_sort algal communities of a geothermally heated lagoon on deception island (south shetland islands)
url http://hdl.handle.net/20.500.12110/paper_07224060_v29_n5_p364_Izaguirre
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AT allendel algalcommunitiesofageothermallyheatedlagoonondeceptionislandsouthshetlandislands
AT tellg algalcommunitiesofageothermallyheatedlagoonondeceptionislandsouthshetlandislands
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