The role of physical stability on the establishment of steady states in the phytoplankton community of two Maritime Antarctic lakes
Two Antarctic lakes near Hope Bay were studied during summers 1998 and 1999. One of the lakes (Boeckella) is located near Esperanza Station and exhibits a meso-eutrophic condition due to the input of nutrients of a nearby penguin rookery. Its surface generally remains ice-free during the Antarctic s...
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v502_n_p211_Allende http://hdl.handle.net/20.500.12110/paper_00188158_v502_n_p211_Allende |
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paper:paper_00188158_v502_n_p211_Allende2023-06-08T14:39:49Z The role of physical stability on the establishment of steady states in the phytoplankton community of two Maritime Antarctic lakes Allende, Luz Izaguirre, Irina Antarctic lakes Functional groups Picocyanobacteria Thermal patterns Bacteria Biodiversity Biomass Ecology Lakes Phase equilibria Wind Water bodies Marine biology community structure ecological stability functional group ice cover lake ecosystem phytoplankton steady-state equilibrium stratification Antarctic Peninsula Antarctica Lake Boeckella Lake Chico West Antarctica algae Bacteria (microorganisms) Chlamydomonas Chromulina Chrysophyceae Esperanza Ochromonas Spheniscidae Two Antarctic lakes near Hope Bay were studied during summers 1998 and 1999. One of the lakes (Boeckella) is located near Esperanza Station and exhibits a meso-eutrophic condition due to the input of nutrients of a nearby penguin rookery. Its surface generally remains ice-free during the Antarctic summer (December-March). The other lake (Chico) is situated on the Mount Flora shelf, is typically oligotrophic and its surface is ice-free only during brief periods in the summer season. The difference in the duration of the ice-cover insures that the wind mixes the former lake continuously throughout the summer, while the latter remains almost always stratified. X2, X3 and Z functional groups defined by Reynolds dominated phytoplankton in both lakes. In Lake Boeckella, Chlamydomonas spp. followed by Ochromonas sp. were the most frequently encountered taxa in the nano-phytoplankton fraction, however the latter species was dominant when the lake froze. In Lake Chico, the major contribution to this fraction was due to different genera of flagellated Chrysophyceae (Ochromonas sp., Chromulina spp., cf. Chrysidalis). In terms of density and biomass in both lakes picocyanobacteria represented a large proportion of the phytoplankton. Probably due to the typically low algal biodiversity of Antarctic lakes, both water bodies showed periods of more than 2 weeks when a maximum of only three species comprised more than 80% of the standing crop. In spite of this, Chico Lake was the only one in which no significant change was recorded in total biomass. Thus, we were able to identify equilibrium phases in the latter lake, which were confirmed by a low coefficient of variation. The presence of an almost permanent ice cover in Chico Lake generated more stable ecological conditions, allowing the development of steady state assemblages. On the contrary, the wind influence in the shallow Antarctic ice free lake (Lake Boeckella) provided continuous mixing events, disrupting the possibility of establishing a steady state. Fil:Allende, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Izaguirre, I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v502_n_p211_Allende http://hdl.handle.net/20.500.12110/paper_00188158_v502_n_p211_Allende |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Antarctic lakes Functional groups Picocyanobacteria Thermal patterns Bacteria Biodiversity Biomass Ecology Lakes Phase equilibria Wind Water bodies Marine biology community structure ecological stability functional group ice cover lake ecosystem phytoplankton steady-state equilibrium stratification Antarctic Peninsula Antarctica Lake Boeckella Lake Chico West Antarctica algae Bacteria (microorganisms) Chlamydomonas Chromulina Chrysophyceae Esperanza Ochromonas Spheniscidae |
| spellingShingle |
Antarctic lakes Functional groups Picocyanobacteria Thermal patterns Bacteria Biodiversity Biomass Ecology Lakes Phase equilibria Wind Water bodies Marine biology community structure ecological stability functional group ice cover lake ecosystem phytoplankton steady-state equilibrium stratification Antarctic Peninsula Antarctica Lake Boeckella Lake Chico West Antarctica algae Bacteria (microorganisms) Chlamydomonas Chromulina Chrysophyceae Esperanza Ochromonas Spheniscidae Allende, Luz Izaguirre, Irina The role of physical stability on the establishment of steady states in the phytoplankton community of two Maritime Antarctic lakes |
| topic_facet |
Antarctic lakes Functional groups Picocyanobacteria Thermal patterns Bacteria Biodiversity Biomass Ecology Lakes Phase equilibria Wind Water bodies Marine biology community structure ecological stability functional group ice cover lake ecosystem phytoplankton steady-state equilibrium stratification Antarctic Peninsula Antarctica Lake Boeckella Lake Chico West Antarctica algae Bacteria (microorganisms) Chlamydomonas Chromulina Chrysophyceae Esperanza Ochromonas Spheniscidae |
| description |
Two Antarctic lakes near Hope Bay were studied during summers 1998 and 1999. One of the lakes (Boeckella) is located near Esperanza Station and exhibits a meso-eutrophic condition due to the input of nutrients of a nearby penguin rookery. Its surface generally remains ice-free during the Antarctic summer (December-March). The other lake (Chico) is situated on the Mount Flora shelf, is typically oligotrophic and its surface is ice-free only during brief periods in the summer season. The difference in the duration of the ice-cover insures that the wind mixes the former lake continuously throughout the summer, while the latter remains almost always stratified. X2, X3 and Z functional groups defined by Reynolds dominated phytoplankton in both lakes. In Lake Boeckella, Chlamydomonas spp. followed by Ochromonas sp. were the most frequently encountered taxa in the nano-phytoplankton fraction, however the latter species was dominant when the lake froze. In Lake Chico, the major contribution to this fraction was due to different genera of flagellated Chrysophyceae (Ochromonas sp., Chromulina spp., cf. Chrysidalis). In terms of density and biomass in both lakes picocyanobacteria represented a large proportion of the phytoplankton. Probably due to the typically low algal biodiversity of Antarctic lakes, both water bodies showed periods of more than 2 weeks when a maximum of only three species comprised more than 80% of the standing crop. In spite of this, Chico Lake was the only one in which no significant change was recorded in total biomass. Thus, we were able to identify equilibrium phases in the latter lake, which were confirmed by a low coefficient of variation. The presence of an almost permanent ice cover in Chico Lake generated more stable ecological conditions, allowing the development of steady state assemblages. On the contrary, the wind influence in the shallow Antarctic ice free lake (Lake Boeckella) provided continuous mixing events, disrupting the possibility of establishing a steady state. |
| author |
Allende, Luz Izaguirre, Irina |
| author_facet |
Allende, Luz Izaguirre, Irina |
| author_sort |
Allende, Luz |
| title |
The role of physical stability on the establishment of steady states in the phytoplankton community of two Maritime Antarctic lakes |
| title_short |
The role of physical stability on the establishment of steady states in the phytoplankton community of two Maritime Antarctic lakes |
| title_full |
The role of physical stability on the establishment of steady states in the phytoplankton community of two Maritime Antarctic lakes |
| title_fullStr |
The role of physical stability on the establishment of steady states in the phytoplankton community of two Maritime Antarctic lakes |
| title_full_unstemmed |
The role of physical stability on the establishment of steady states in the phytoplankton community of two Maritime Antarctic lakes |
| title_sort |
role of physical stability on the establishment of steady states in the phytoplankton community of two maritime antarctic lakes |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v502_n_p211_Allende http://hdl.handle.net/20.500.12110/paper_00188158_v502_n_p211_Allende |
| work_keys_str_mv |
AT allendeluz theroleofphysicalstabilityontheestablishmentofsteadystatesinthephytoplanktoncommunityoftwomaritimeantarcticlakes AT izaguirreirina theroleofphysicalstabilityontheestablishmentofsteadystatesinthephytoplanktoncommunityoftwomaritimeantarcticlakes AT allendeluz roleofphysicalstabilityontheestablishmentofsteadystatesinthephytoplanktoncommunityoftwomaritimeantarcticlakes AT izaguirreirina roleofphysicalstabilityontheestablishmentofsteadystatesinthephytoplanktoncommunityoftwomaritimeantarcticlakes |
| _version_ |
1768546427884011520 |