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Microbial activity and phylogeny in ice cores retrieved from Lake Paula, a newly detected freshwater lake in Antarctica

Microbial activity and phylogeny in ice cores retrieved from Lake Paula, a newly detected freshwater lake in Antarctica

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SATTLER, Birgit, Sebastian WALDHUBER, Roland PSENNER, Helgard FISCHER, Hans SEMMLER, Paul SIPIERA, 2004. Microbial activity and phylogeny in ice cores retrieved from Lake Paula, a newly detected freshwater lake in Antarctica. Optical Science and Technology, the SPIE 49th Annual Meeting. Denver, CO. In: HOOVER, Richard B., ed., Gilbert V. LEVIN, ed., Alexei Y. ROZANOV, ed.. Instruments, Methods, and Missions for Astrobiology VIII. Optical Science and Technology, the SPIE 49th Annual Meeting. Denver, CO. SPIE, pp. 170-179

@inproceedings{Sattler2004-11-01Micro-15081, title={Microbial activity and phylogeny in ice cores retrieved from Lake Paula, a newly detected freshwater lake in Antarctica}, year={2004}, doi={10.1117/12.564554}, number={5555}, publisher={SPIE}, series={SPIE Proceedings}, booktitle={Instruments, Methods, and Missions for Astrobiology VIII}, pages={170--179}, editor={Hoover, Richard B. and Levin, Gilbert V. and Rozanov, Alexei Y.}, author={Sattler, Birgit and Waldhuber, Sebastian and Psenner, Roland and Fischer, Helgard and Semmler, Hans and Sipiera, Paul} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/15081"> <dc:contributor>Semmler, Hans</dc:contributor> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/15081"/> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-12-07T08:11:37Z</dc:date> <dcterms:issued>2004-11-01</dcterms:issued> <dc:creator>Sipiera, Paul</dc:creator> <dc:creator>Psenner, Roland</dc:creator> <dcterms:bibliographicCitation>Publ. in: Instruments, methods, and missions for astrobiology VIII : 2 - 3 August 2004, Denver, Colorado, USA / sponsored and publ. by SPIE, the International Society for Optical Engineering. Cooperating organization: the Geological Society of America. Richard B. Hoover ..., chairs/ed. - Bellingham, Wash. : SPIE, 2004. - S. 170-179. - (SPIE proceedings series ; 5555). - ISBN -8194-5493-1</dcterms:bibliographicCitation> <dc:creator>Sattler, Birgit</dc:creator> <dc:contributor>Sipiera, Paul</dc:contributor> <dcterms:abstract xml:lang="eng">A permanent ice covered water body, called Lake Paula, was detected in Patriot Hills in the West Antarctic and sampled for the first time ever for microbial life. The ice sheet measured approximately 2,5m thickness and the water body has a depth of about 10m. The lake is situated near a moraine which partly ablates from snow and provides meltwater from the slopes to the lake during austral summer. These running waters which are kept liquid by the heating up of the dark soil are penetrating the lower ice cover and thus softening up the lakeside part if the ice core. It is inoculated by nutrients, active microbes and diatoms of terrestrial origin. A distinct gradient concerning bacterial numbers, biomass and production which is 10 fold at the ice-water interface compared to the exposed part is observable. Temperature sensitivity of the embedded microbes reflect the gradient as well: Bacteria isolated from the upper part showed growth optima at 10°C, the lower part at 25°C, phylogenetic properties done by 16s rDNA reveal distinct communities depending on their vertical position, some clones are similar to those retrieved in Lake Vostok ice cores.These results offer the conclusion that even in this harsh environment like the Antarctic continent a dynamic system like microbial ice aggregates can be sustained as long as the supply of liquid water which is essential for an active bacterial metabolism is provided at least for a small time frame.</dcterms:abstract> <dc:rights>deposit-license</dc:rights> <dc:contributor>Waldhuber, Sebastian</dc:contributor> <dc:contributor>Fischer, Helgard</dc:contributor> <dc:contributor>Sattler, Birgit</dc:contributor> <dc:language>eng</dc:language> <dcterms:rights rdf:resource="http://nbn-resolving.org/urn:nbn:de:bsz:352-20140905103605204-4002607-1"/> <dc:creator>Fischer, Helgard</dc:creator> <dcterms:title>Microbial activity and phylogeny in ice cores retrieved from Lake Paula, a newly detected freshwater lake in Antarctica</dcterms:title> <dc:creator>Semmler, Hans</dc:creator> <dc:contributor>Psenner, Roland</dc:contributor> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-12-07T08:11:37Z</dcterms:available> <dc:creator>Waldhuber, Sebastian</dc:creator> </rdf:Description> </rdf:RDF>

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