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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todo:paper_07224060_v35_n2_p231_Izaguirre2023-10-03T15:37:07Z Responses of a Maritime Antarctic lake to a catastrophic draining event under a climate change scenario Izaguirre, I. Pizarro, H. Allende, L. Unrein, F. Rodríguez, P. Marinone, M.C. Tell, G. Catastrophic draining event Climate change Lake Maritime Antarctica Permafrost Phytoplankton air temperature alga bacterium catastrophic event catchment chlorophyll a climate change disturbance ecosystem response euphotic zone eutrophication limnology nutrient cycling permafrost physicochemical property plankton thawing water level Antarctica Boeckella Lake West Antarctica algae Boeckella Chlamydomonadales Chrysophyceae Eukaryota 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. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rodríguez, P. 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_v35_n2_p231_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 |
Catastrophic draining event Climate change Lake Maritime Antarctica Permafrost Phytoplankton air temperature alga bacterium catastrophic event catchment chlorophyll a climate change disturbance ecosystem response euphotic zone eutrophication limnology nutrient cycling permafrost 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 climate change disturbance ecosystem response euphotic zone eutrophication limnology nutrient cycling permafrost physicochemical property plankton thawing water level Antarctica Boeckella Lake West Antarctica algae Boeckella Chlamydomonadales Chrysophyceae Eukaryota Izaguirre, I. Pizarro, H. Allende, L. Unrein, F. Rodríguez, P. Marinone, M.C. Tell, G. 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 climate change disturbance ecosystem response euphotic zone eutrophication limnology nutrient cycling permafrost 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. |
| format |
JOUR |
| author |
Izaguirre, I. Pizarro, H. Allende, L. Unrein, F. Rodríguez, P. Marinone, M.C. Tell, G. |
| author_facet |
Izaguirre, I. Pizarro, H. Allende, L. Unrein, F. Rodríguez, P. Marinone, M.C. Tell, G. |
| author_sort |
Izaguirre, I. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_07224060_v35_n2_p231_Izaguirre |
| work_keys_str_mv |
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1807316424276836352 |