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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2008
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| Accesso online: | https://doi.org/10.1594/PANGAEA.809498 |
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| _version_ | 1867169081562497024 |
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| author | Elster, Josef Degma, Peter Kovácik, Lubomir Valentová, Lucia Sramková, Katarina Pereira, Antonio Batista |
| author_facet | Elster, Josef Degma, Peter Kovácik, Lubomir Valentová, Lucia Sramková, Katarina Pereira, Antonio Batista |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The freezing and desiccation tolerance of 12 Klebsormidium strains, isolated from various habitats (aero-terrestrial, terrestrial, and hydro-terrestrial) from distinct geographical regions (Antarctic - South Shetlands, King George Island, Arctic - Ellesmere Island, Svalbard, Central Europe - Slovakia) were studied. Each strain was exposed to several freezing (-4°C, -40°C, -196°C) and desiccation (+4°C and +20°C) regimes, simulating both natural and semi-natural freeze-thaw and desiccation cycles. The level of resistance (or the survival capacity) was evaluated by chlorophyll a content, viability, and chlorophyll fluorescence evaluations. No statistical differences (Kruskal-Wallis tests) between strains originating from different regions were observed. All strains tested were highly resistant to both freezing and desiccation injuries. Freezing down to -196°C was the most harmful regime for all studied strains. Freezing at -4°C did not influence the survival of studied strains. Further, freezing down to -40°C (at a speed of 4°C/min) was not fatal for most of the strains. RDA analysis showed that certain Antarctic and Arctic strains did not survive desiccation at +4°C; however, freezing at -40°C, as well as desiccation at +20 °C was not fatal to them. On the other hand, other strains from the Antarctic, the Arctic, and Central Europe (Slovakia) survived desiccation at temperatures of +4°C, and freezing down to -40°C. It appears that species of Klebsormidium which occupy an environment where both seasonal and diurnal variations of water availability prevail, are well adapted to freezing and desiccation injuries. Freezing and desiccation tolerance is not species-specific nor is the resilience only found in polar strains as it is also a feature of temperate strains. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_809498 |
| institution | PANGAEA |
| language | en |
| publishDate | 2008 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Characteristics of Klebsormidium (filamentous green algae) strains from the Antarctic, Arctic and Slovakia Elster, Josef Degma, Peter Kovácik, Lubomir Valentová, Lucia Sramková, Katarina Pereira, Antonio Batista Area/locality; Biological sample; BIOS; Bratislava_cemt; Bratislava_crypt; Broeggerbreen; Characteristic; Crepin_Pt; Ellesmere Island, Canadian Arctic Archipelago; Event label; Genus; Gombasecka_cave; International Polar Year (2007-2008); IPY; Keller_Penins-1; Keller_Penins-2; King George Island, Antarctic Peninsula; Latitude of event; Length; Longitude of event; Name; Slovakia, Europe; Substrate type; Svalbard; Teardrop_Glacier; Width; Year of publication The freezing and desiccation tolerance of 12 Klebsormidium strains, isolated from various habitats (aero-terrestrial, terrestrial, and hydro-terrestrial) from distinct geographical regions (Antarctic - South Shetlands, King George Island, Arctic - Ellesmere Island, Svalbard, Central Europe - Slovakia) were studied. Each strain was exposed to several freezing (-4°C, -40°C, -196°C) and desiccation (+4°C and +20°C) regimes, simulating both natural and semi-natural freeze-thaw and desiccation cycles. The level of resistance (or the survival capacity) was evaluated by chlorophyll a content, viability, and chlorophyll fluorescence evaluations. No statistical differences (Kruskal-Wallis tests) between strains originating from different regions were observed. All strains tested were highly resistant to both freezing and desiccation injuries. Freezing down to -196°C was the most harmful regime for all studied strains. Freezing at -4°C did not influence the survival of studied strains. Further, freezing down to -40°C (at a speed of 4°C/min) was not fatal for most of the strains. RDA analysis showed that certain Antarctic and Arctic strains did not survive desiccation at +4°C; however, freezing at -40°C, as well as desiccation at +20 °C was not fatal to them. On the other hand, other strains from the Antarctic, the Arctic, and Central Europe (Slovakia) survived desiccation at temperatures of +4°C, and freezing down to -40°C. It appears that species of Klebsormidium which occupy an environment where both seasonal and diurnal variations of water availability prevail, are well adapted to freezing and desiccation injuries. Freezing and desiccation tolerance is not species-specific nor is the resilience only found in polar strains as it is also a feature of temperate strains. |
| title | (Table 1) Characteristics of Klebsormidium (filamentous green algae) strains from the Antarctic, Arctic and Slovakia |
| topic | Area/locality; Biological sample; BIOS; Bratislava_cemt; Bratislava_crypt; Broeggerbreen; Characteristic; Crepin_Pt; Ellesmere Island, Canadian Arctic Archipelago; Event label; Genus; Gombasecka_cave; International Polar Year (2007-2008); IPY; Keller_Penins-1; Keller_Penins-2; King George Island, Antarctic Peninsula; Latitude of event; Length; Longitude of event; Name; Slovakia, Europe; Substrate type; Svalbard; Teardrop_Glacier; Width; Year of publication |
| url | https://doi.org/10.1594/PANGAEA.809498 |