The Molecular and Physiological Mechanisms of Microbial Survival in Antarctic Lakes
Metadata record for data expected from ASAC Project 1152 See the link below for public details on this project. --- Public Summary from Project --- The small ice-free areas of Antarctica carry a remarkable range of lakes. Within the Vestfold Hills there are several hundred lakes and ponds, many of w...
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Format: | Dataset |
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Australian Antarctic Data Centre
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Online Access: | https://researchdata.ands.org.au/molecular-physiological-mechanisms-antarctic-lakes/699466 https://doi.org/10.4225/15/54E3C98E2C1D7 https://data.aad.gov.au/metadata/records/ASAC_1152 http://nla.gov.au/nla.party-617536 |
id |
ftands:oai:ands.org.au::699466 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
geoscientificInformation inlandWaters EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS BACTERIA/ARCHAEA EARTH SCIENCE BIOLOGICAL CLASSIFICATION CHLOROPHYLL OCEANS OCEAN CHEMISTRY PIGMENTS CHLAMYDOMONAS CHLOROPHYLL A CILIATE MESODINIUM CRYPTOPHYTE DAPHNIOPSIS DATE DEPTH HETEROTROPHIC BACTERIA HETEROTROPHIC NANOFLAGELLATES PARALABIDOCERA PYRAMIMONAS FIELD INVESTIGATION FIELD SURVEYS CONTINENT > ANTARCTICA > Vestfold Hills GEOGRAPHIC REGION > POLAR |
spellingShingle |
geoscientificInformation inlandWaters EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS BACTERIA/ARCHAEA EARTH SCIENCE BIOLOGICAL CLASSIFICATION CHLOROPHYLL OCEANS OCEAN CHEMISTRY PIGMENTS CHLAMYDOMONAS CHLOROPHYLL A CILIATE MESODINIUM CRYPTOPHYTE DAPHNIOPSIS DATE DEPTH HETEROTROPHIC BACTERIA HETEROTROPHIC NANOFLAGELLATES PARALABIDOCERA PYRAMIMONAS FIELD INVESTIGATION FIELD SURVEYS CONTINENT > ANTARCTICA > Vestfold Hills GEOGRAPHIC REGION > POLAR The Molecular and Physiological Mechanisms of Microbial Survival in Antarctic Lakes |
topic_facet |
geoscientificInformation inlandWaters EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS BACTERIA/ARCHAEA EARTH SCIENCE BIOLOGICAL CLASSIFICATION CHLOROPHYLL OCEANS OCEAN CHEMISTRY PIGMENTS CHLAMYDOMONAS CHLOROPHYLL A CILIATE MESODINIUM CRYPTOPHYTE DAPHNIOPSIS DATE DEPTH HETEROTROPHIC BACTERIA HETEROTROPHIC NANOFLAGELLATES PARALABIDOCERA PYRAMIMONAS FIELD INVESTIGATION FIELD SURVEYS CONTINENT > ANTARCTICA > Vestfold Hills GEOGRAPHIC REGION > POLAR |
description |
Metadata record for data expected from ASAC Project 1152 See the link below for public details on this project. --- Public Summary from Project --- The small ice-free areas of Antarctica carry a remarkable range of lakes. Within the Vestfold Hills there are several hundred lakes and ponds, many of which are saline. All Antarctic freshwater and saline lakes have simple food webs that are dominated by micro-organisms (bacteria, algae and protozoa). There are no fish and very few zooplankton. These micro-organisms have evolved novel biochemicals and physiological adaptations which enable them to survive and function at sub-zero temperatures in saline lake waters. For example previous work has shown that many of the bacteria contain antifreeze proteins which prevent the cell contents from freezing. If these bacteria have invested in the evolution of antifreeze proteins they must also have developed suites of low temperatures enzymes which mediate routine cellular functions. One aspect of this project will concentrate on identifying such enzymes and quantifying their activity in different bacterial species, which will be identified using modern molecular techniques. Thus the outcome will be a picture of what enzymes occur, and which bacterial groups possess them. Low temperature enzymes have many potential industrial uses and it is hoped that some of the enzymes identified may be developed by industry. The commercial application of some low temperature enzymes, e.g. lipases, are presently being trialled Our previous work in Vestfold Hills has shown that during the Antarctic winter many of the most successful and abundant protozoans maintain active populations, so that when the brief austral summer arrives 'they hit the deck running'. In order to do this many of them possess extraordinary nutritional versatility. They are able to undertake photosynthesis like plants and eat bacteria. As day length and the light climate change in the annual cycle, such species switch from a dependence on photosynthesis in summer, to feeding on bacteria in winter. We propose investigating this phenomenon, known as mixotrophy, in a number of the dominant species (Pyramimonas and Cryptomonas) in several of the saline lakes within the Vestfold Hills. This work will contribute to understanding how pristine Antarctic lake ecosystems function; information which is fundamental to monitoring changes induced by climate change. It has recently been reported that environmental warming alters food web structure and trophic interactions (Petchy et al., 1999). These delicate ecosystems are likely to show rapid response to climatic perturbations, indeed long-term work in the Dry Valleys of Southern Victoria Land has demonstrated that Antarctic lakes are responding markedly to climate change. The download file contains an excel spreadsheet of data from Ace Lake and Highway Lake, as well as two word documents, one containing further data, and another containing details on the methods used in the data collection and analysis. The fields in this dataset are: Date Depth Chlamydomonas Cryptophyte Heterotrophic bacteria Heterotrophic nanoflagellates Ciliate Mesodinium Paralabidocera Pyramimonas Daphniopsis Chlorophyll a |
author2 |
LAYBOURN-PARRY, JOHANNA (hasPrincipalInvestigator) LAYBOURN-PARRY, JOHANNA (processor) Australian Antarctic Data Centre (publisher) |
format |
Dataset |
title |
The Molecular and Physiological Mechanisms of Microbial Survival in Antarctic Lakes |
title_short |
The Molecular and Physiological Mechanisms of Microbial Survival in Antarctic Lakes |
title_full |
The Molecular and Physiological Mechanisms of Microbial Survival in Antarctic Lakes |
title_fullStr |
The Molecular and Physiological Mechanisms of Microbial Survival in Antarctic Lakes |
title_full_unstemmed |
The Molecular and Physiological Mechanisms of Microbial Survival in Antarctic Lakes |
title_sort |
molecular and physiological mechanisms of microbial survival in antarctic lakes |
publisher |
Australian Antarctic Data Centre |
url |
https://researchdata.ands.org.au/molecular-physiological-mechanisms-antarctic-lakes/699466 https://doi.org/10.4225/15/54E3C98E2C1D7 https://data.aad.gov.au/metadata/records/ASAC_1152 http://nla.gov.au/nla.party-617536 |
op_coverage |
Spatial: northlimit=-68.4718; southlimit=-68.4718; westlimit=78.1878; eastLimit=78.1878; projection=WGS84 Spatial: northlimit=-68.4633; southlimit=-68.4633; westlimit=78.2233; eastLimit=78.2233; projection=WGS84 Temporal: From 2001-02-25 to 2002-02-15 |
long_lat |
ENVELOPE(78.188,78.188,-68.472,-68.472) ENVELOPE(-111.528,-111.528,57.081,57.081) ENVELOPE(78.223,78.223,-68.463,-68.463) ENVELOPE(78.1878,78.1878,-68.4718,-68.4718) ENVELOPE(78.2233,78.2233,-68.4633,-68.4633) |
geographic |
Antarctic The Antarctic Austral Victoria Land Vestfold Hills Vestfold Ace Lake Saline Lake Highway Lake |
geographic_facet |
Antarctic The Antarctic Austral Victoria Land Vestfold Hills Vestfold Ace Lake Saline Lake Highway Lake |
genre |
Antarc* Antarctic Antarctica Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica Victoria Land |
op_source |
Australian Antarctic Data Centre |
op_relation |
https://researchdata.ands.org.au/molecular-physiological-mechanisms-antarctic-lakes/699466 4f4c57d7-1120-4d5b-aa4b-2128bd9ef407 doi:10.4225/15/54E3C98E2C1D7 ASAC_1152 https://data.aad.gov.au/metadata/records/ASAC_1152 http://nla.gov.au/nla.party-617536 |
op_doi |
https://doi.org/10.4225/15/54E3C98E2C1D7 |
_version_ |
1766245827100016640 |
spelling |
ftands:oai:ands.org.au::699466 2023-05-15T13:46:57+02:00 The Molecular and Physiological Mechanisms of Microbial Survival in Antarctic Lakes LAYBOURN-PARRY, JOHANNA (hasPrincipalInvestigator) LAYBOURN-PARRY, JOHANNA (processor) Australian Antarctic Data Centre (publisher) Spatial: northlimit=-68.4718; southlimit=-68.4718; westlimit=78.1878; eastLimit=78.1878; projection=WGS84 Spatial: northlimit=-68.4633; southlimit=-68.4633; westlimit=78.2233; eastLimit=78.2233; projection=WGS84 Temporal: From 2001-02-25 to 2002-02-15 https://researchdata.ands.org.au/molecular-physiological-mechanisms-antarctic-lakes/699466 https://doi.org/10.4225/15/54E3C98E2C1D7 https://data.aad.gov.au/metadata/records/ASAC_1152 http://nla.gov.au/nla.party-617536 unknown Australian Antarctic Data Centre https://researchdata.ands.org.au/molecular-physiological-mechanisms-antarctic-lakes/699466 4f4c57d7-1120-4d5b-aa4b-2128bd9ef407 doi:10.4225/15/54E3C98E2C1D7 ASAC_1152 https://data.aad.gov.au/metadata/records/ASAC_1152 http://nla.gov.au/nla.party-617536 Australian Antarctic Data Centre geoscientificInformation inlandWaters EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS BACTERIA/ARCHAEA EARTH SCIENCE BIOLOGICAL CLASSIFICATION CHLOROPHYLL OCEANS OCEAN CHEMISTRY PIGMENTS CHLAMYDOMONAS CHLOROPHYLL A CILIATE MESODINIUM CRYPTOPHYTE DAPHNIOPSIS DATE DEPTH HETEROTROPHIC BACTERIA HETEROTROPHIC NANOFLAGELLATES PARALABIDOCERA PYRAMIMONAS FIELD INVESTIGATION FIELD SURVEYS CONTINENT > ANTARCTICA > Vestfold Hills GEOGRAPHIC REGION > POLAR dataset ftands https://doi.org/10.4225/15/54E3C98E2C1D7 2020-01-05T21:16:19Z Metadata record for data expected from ASAC Project 1152 See the link below for public details on this project. --- Public Summary from Project --- The small ice-free areas of Antarctica carry a remarkable range of lakes. Within the Vestfold Hills there are several hundred lakes and ponds, many of which are saline. All Antarctic freshwater and saline lakes have simple food webs that are dominated by micro-organisms (bacteria, algae and protozoa). There are no fish and very few zooplankton. These micro-organisms have evolved novel biochemicals and physiological adaptations which enable them to survive and function at sub-zero temperatures in saline lake waters. For example previous work has shown that many of the bacteria contain antifreeze proteins which prevent the cell contents from freezing. If these bacteria have invested in the evolution of antifreeze proteins they must also have developed suites of low temperatures enzymes which mediate routine cellular functions. One aspect of this project will concentrate on identifying such enzymes and quantifying their activity in different bacterial species, which will be identified using modern molecular techniques. Thus the outcome will be a picture of what enzymes occur, and which bacterial groups possess them. Low temperature enzymes have many potential industrial uses and it is hoped that some of the enzymes identified may be developed by industry. The commercial application of some low temperature enzymes, e.g. lipases, are presently being trialled Our previous work in Vestfold Hills has shown that during the Antarctic winter many of the most successful and abundant protozoans maintain active populations, so that when the brief austral summer arrives 'they hit the deck running'. In order to do this many of them possess extraordinary nutritional versatility. They are able to undertake photosynthesis like plants and eat bacteria. As day length and the light climate change in the annual cycle, such species switch from a dependence on photosynthesis in summer, to feeding on bacteria in winter. We propose investigating this phenomenon, known as mixotrophy, in a number of the dominant species (Pyramimonas and Cryptomonas) in several of the saline lakes within the Vestfold Hills. This work will contribute to understanding how pristine Antarctic lake ecosystems function; information which is fundamental to monitoring changes induced by climate change. It has recently been reported that environmental warming alters food web structure and trophic interactions (Petchy et al., 1999). These delicate ecosystems are likely to show rapid response to climatic perturbations, indeed long-term work in the Dry Valleys of Southern Victoria Land has demonstrated that Antarctic lakes are responding markedly to climate change. The download file contains an excel spreadsheet of data from Ace Lake and Highway Lake, as well as two word documents, one containing further data, and another containing details on the methods used in the data collection and analysis. The fields in this dataset are: Date Depth Chlamydomonas Cryptophyte Heterotrophic bacteria Heterotrophic nanoflagellates Ciliate Mesodinium Paralabidocera Pyramimonas Daphniopsis Chlorophyll a Dataset Antarc* Antarctic Antarctica Victoria Land Research Data Australia (Australian National Data Service - ANDS) Antarctic The Antarctic Austral Victoria Land Vestfold Hills Vestfold Ace Lake ENVELOPE(78.188,78.188,-68.472,-68.472) Saline Lake ENVELOPE(-111.528,-111.528,57.081,57.081) Highway Lake ENVELOPE(78.223,78.223,-68.463,-68.463) ENVELOPE(78.1878,78.1878,-68.4718,-68.4718) ENVELOPE(78.2233,78.2233,-68.4633,-68.4633) |