Responses of a Maritime Antarctic lake to a catastrophic draining event under a climate change scenario
The limnological features of Lake Boeckella, the main water body of Esperanza/Hope Bay (Antarctic Peninsula), were evaluated over a 16-year period, under a climate change context evidenced by the increasing air temperature trend reported for this region for the last 50 years. We analyzed the physico...
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ftunibueairesbd:paper:paper_07224060_v35_n2_p231_Izaguirre 2023-05-15T13:51:24+02:00 Responses of a Maritime Antarctic lake to a catastrophic draining event under a climate change scenario Izaguirre, Irina Pizarro, Haydee Norma Allende, Luz Unrein, Fernando Rodríguez, Patricia Laura 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v35_n2_p231_Izaguirre https://hdl.handle.net/20.500.12110/paper_07224060_v35_n2_p231_Izaguirre unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v35_n2_p231_Izaguirre http://hdl.handle.net/20.500.12110/paper_07224060_v35_n2_p231_Izaguirre Catastrophic draining event Climate change Lake Maritime Antarctica Permafrost Phytoplankton air temperature alga bacterium catastrophic event catchment chlorophyll a disturbance ecosystem response euphotic zone eutrophication limnology nutrient cycling physicochemical property plankton thawing water level Antarctica Boeckella Lake West Antarctica algae Boeckella Chlamydomonadales Chrysophyceae Eukaryota 2012 ftunibueairesbd https://doi.org/20.500.12110/paper_07224060_v35_n2_p231_Izaguirre 2023-02-16T02:06:32Z The limnological features of Lake Boeckella, the main water body of Esperanza/Hope Bay (Antarctic Peninsula), were evaluated over a 16-year period, under a climate change context evidenced by the increasing air temperature trend reported for this region for the last 50 years. We analyzed the physicochemical and phytoplankton data of the lake obtained from 1991 to 2007 during the austral summers. At the beginning of January 2001, a sudden water level drop (3 m) occurred in Lake Boeckella as a consequence of an extremely high water discharge to the sea. This was triggered by the progressive thawing of the permafrost in the basin of the system. After this disturbance, nutrients, conductivity, chlorophyll a (Chl a) and picoplankton density showed strong peaks. The pre-draining and post-draining periods showed significant differences for most of the limnological variables analyzed. Secchi disk depth significantly decreased throughout the study period, resulting in a thinner euphotic layer. Chrysophyceae and Volvocales dominated the <2 μm phytoplankton fraction in the lake, but from 2004 onwards, other small-sized eukaryotic algae (3-5 μm) also became very abundant. Autotrophic picoplankton showed a significant peak during the summer when the water level decreased. A shift in their composition was observed through the study period: in 1998, picocyanobacteria were numerically dominant; from 2002 onwards, picoeukaryotes increased and became dominant in 2004. This study suggests that climate change may trigger the thawing of the permafrost in the catchments of Maritime Antarctic lakes, leading to catastrophic draining events, which favor natural eutrophication processes. © 2011 Springer-Verlag. Fil:Izaguirre, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pizarro, H. 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. Fil:Unrein, F. ... Other/Unknown Material Antarc* Antarctic Antarctic Peninsula Antarctica permafrost West Antarctica Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Antarctic Antarctic Peninsula Argentina Austral Boeckella ENVELOPE(-56.999,-56.999,-63.404,-63.404) Boeckella Lake ENVELOPE(-56.999,-56.999,-63.404,-63.404) Esperanza ENVELOPE(-56.983,-56.983,-63.400,-63.400) Hope Bay ENVELOPE(-57.038,-57.038,-63.403,-63.403) Lake Boeckella ENVELOPE(-57.000,-57.000,-63.400,-63.400) West Antarctica |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Catastrophic draining event Climate change Lake Maritime Antarctica Permafrost Phytoplankton air temperature alga bacterium catastrophic event catchment chlorophyll a disturbance ecosystem response euphotic zone eutrophication limnology nutrient cycling physicochemical property plankton thawing water level Antarctica Boeckella Lake West Antarctica algae Boeckella Chlamydomonadales Chrysophyceae Eukaryota |
spellingShingle |
Catastrophic draining event Climate change Lake Maritime Antarctica Permafrost Phytoplankton air temperature alga bacterium catastrophic event catchment chlorophyll a disturbance ecosystem response euphotic zone eutrophication limnology nutrient cycling physicochemical property plankton thawing water level Antarctica Boeckella Lake West Antarctica algae Boeckella Chlamydomonadales Chrysophyceae Eukaryota Izaguirre, Irina Pizarro, Haydee Norma Allende, Luz Unrein, Fernando Rodríguez, Patricia Laura Responses of a Maritime Antarctic lake to a catastrophic draining event under a climate change scenario |
topic_facet |
Catastrophic draining event Climate change Lake Maritime Antarctica Permafrost Phytoplankton air temperature alga bacterium catastrophic event catchment chlorophyll a disturbance ecosystem response euphotic zone eutrophication limnology nutrient cycling physicochemical property plankton thawing water level Antarctica Boeckella Lake West Antarctica algae Boeckella Chlamydomonadales Chrysophyceae Eukaryota |
description |
The limnological features of Lake Boeckella, the main water body of Esperanza/Hope Bay (Antarctic Peninsula), were evaluated over a 16-year period, under a climate change context evidenced by the increasing air temperature trend reported for this region for the last 50 years. We analyzed the physicochemical and phytoplankton data of the lake obtained from 1991 to 2007 during the austral summers. At the beginning of January 2001, a sudden water level drop (3 m) occurred in Lake Boeckella as a consequence of an extremely high water discharge to the sea. This was triggered by the progressive thawing of the permafrost in the basin of the system. After this disturbance, nutrients, conductivity, chlorophyll a (Chl a) and picoplankton density showed strong peaks. The pre-draining and post-draining periods showed significant differences for most of the limnological variables analyzed. Secchi disk depth significantly decreased throughout the study period, resulting in a thinner euphotic layer. Chrysophyceae and Volvocales dominated the <2 μm phytoplankton fraction in the lake, but from 2004 onwards, other small-sized eukaryotic algae (3-5 μm) also became very abundant. Autotrophic picoplankton showed a significant peak during the summer when the water level decreased. A shift in their composition was observed through the study period: in 1998, picocyanobacteria were numerically dominant; from 2002 onwards, picoeukaryotes increased and became dominant in 2004. This study suggests that climate change may trigger the thawing of the permafrost in the catchments of Maritime Antarctic lakes, leading to catastrophic draining events, which favor natural eutrophication processes. © 2011 Springer-Verlag. Fil:Izaguirre, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pizarro, H. 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. Fil:Unrein, F. ... |
author |
Izaguirre, Irina Pizarro, Haydee Norma Allende, Luz Unrein, Fernando Rodríguez, Patricia Laura |
author_facet |
Izaguirre, Irina Pizarro, Haydee Norma Allende, Luz Unrein, Fernando Rodríguez, Patricia Laura |
author_sort |
Izaguirre, Irina |
title |
Responses of a Maritime Antarctic lake to a catastrophic draining event under a climate change scenario |
title_short |
Responses of a Maritime Antarctic lake to a catastrophic draining event under a climate change scenario |
title_full |
Responses of a Maritime Antarctic lake to a catastrophic draining event under a climate change scenario |
title_fullStr |
Responses of a Maritime Antarctic lake to a catastrophic draining event under a climate change scenario |
title_full_unstemmed |
Responses of a Maritime Antarctic lake to a catastrophic draining event under a climate change scenario |
title_sort |
responses of a maritime antarctic lake to a catastrophic draining event under a climate change scenario |
publishDate |
2012 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v35_n2_p231_Izaguirre https://hdl.handle.net/20.500.12110/paper_07224060_v35_n2_p231_Izaguirre |
long_lat |
ENVELOPE(-56.999,-56.999,-63.404,-63.404) ENVELOPE(-56.999,-56.999,-63.404,-63.404) ENVELOPE(-56.983,-56.983,-63.400,-63.400) ENVELOPE(-57.038,-57.038,-63.403,-63.403) ENVELOPE(-57.000,-57.000,-63.400,-63.400) |
geographic |
Antarctic Antarctic Peninsula Argentina Austral Boeckella Boeckella Lake Esperanza Hope Bay Lake Boeckella West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Argentina Austral Boeckella Boeckella Lake Esperanza Hope Bay Lake Boeckella West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica permafrost West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica permafrost West Antarctica |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07224060_v35_n2_p231_Izaguirre http://hdl.handle.net/20.500.12110/paper_07224060_v35_n2_p231_Izaguirre |
op_doi |
https://doi.org/20.500.12110/paper_07224060_v35_n2_p231_Izaguirre |
_version_ |
1766255245759873024 |