Interaction between Carbon and Sulfur Cycles in Antarctic Stratified Lakes and Fjords
--- Public Summary from Project --- The lakes and fjords of the Vestfold Hills region of Antarctica provide unique ecosystems for studying environmental changes in Antarctica over the past 8000 years. Studies of the changes in organic matter composition in sediment cores provide information how the...
Other Authors: | , , |
---|---|
Format: | Dataset |
Language: | unknown |
Published: |
Australian Antarctic Data Centre
|
Subjects: | |
Online Access: | https://researchdata.ands.org.au/interaction-carbon-sulfur-lakes-fjords/699540 https://data.aad.gov.au/metadata/records/ASAC_1166 http://nla.gov.au/nla.party-617536 |
id |
ftands:oai:ands.org.au::699540 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
biota climatologyMeteorologyAtmosphere geoscientificInformation inlandWaters oceans FJORDS EARTH SCIENCE COASTAL PROCESSES SEDIMENTS PALEOCLIMATE OCEAN/LAKE RECORDS BIOGEOCHEMICAL PROCESSES SOLID EARTH GEOCHEMISTRY BACTERIA/ARCHAEA BIOLOGICAL CLASSIFICATION PHYTOPLANKTON BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > COASTAL FRESHWATER ECOSYSTEMS > LAKE/POND BIOGEOCHEMICAL CYCLES ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS ACE LAKE ALKENONES BIOMARKERS CAROTENOIDS DIAGENESIS ELLIS FJORD FATTY ACIDS LIPIDS MICROBIAL ACTIVITY ORGANIC GEOCHEMISTRY ORGANIC MATTER PALAEOCLIMATE PALAEOENVIRONMENT PALEOENVIRONMENT STEROLS SULFURISATION VESTFOLD HILLS HPLC > High-Performance Liquid Chromatograph NISKIN BOTTLES GAS CHROMATOGRAPHS GC-MS > Gas Chromatograph/Mass Spectrometry FIELD SURVEYS FIELD INVESTIGATION CONTINENT > ANTARCTICA > GEOGRAPHIC REGION > POLAR |
spellingShingle |
biota climatologyMeteorologyAtmosphere geoscientificInformation inlandWaters oceans FJORDS EARTH SCIENCE COASTAL PROCESSES SEDIMENTS PALEOCLIMATE OCEAN/LAKE RECORDS BIOGEOCHEMICAL PROCESSES SOLID EARTH GEOCHEMISTRY BACTERIA/ARCHAEA BIOLOGICAL CLASSIFICATION PHYTOPLANKTON BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > COASTAL FRESHWATER ECOSYSTEMS > LAKE/POND BIOGEOCHEMICAL CYCLES ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS ACE LAKE ALKENONES BIOMARKERS CAROTENOIDS DIAGENESIS ELLIS FJORD FATTY ACIDS LIPIDS MICROBIAL ACTIVITY ORGANIC GEOCHEMISTRY ORGANIC MATTER PALAEOCLIMATE PALAEOENVIRONMENT PALEOENVIRONMENT STEROLS SULFURISATION VESTFOLD HILLS HPLC > High-Performance Liquid Chromatograph NISKIN BOTTLES GAS CHROMATOGRAPHS GC-MS > Gas Chromatograph/Mass Spectrometry FIELD SURVEYS FIELD INVESTIGATION CONTINENT > ANTARCTICA > GEOGRAPHIC REGION > POLAR Interaction between Carbon and Sulfur Cycles in Antarctic Stratified Lakes and Fjords |
topic_facet |
biota climatologyMeteorologyAtmosphere geoscientificInformation inlandWaters oceans FJORDS EARTH SCIENCE COASTAL PROCESSES SEDIMENTS PALEOCLIMATE OCEAN/LAKE RECORDS BIOGEOCHEMICAL PROCESSES SOLID EARTH GEOCHEMISTRY BACTERIA/ARCHAEA BIOLOGICAL CLASSIFICATION PHYTOPLANKTON BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > COASTAL FRESHWATER ECOSYSTEMS > LAKE/POND BIOGEOCHEMICAL CYCLES ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS ACE LAKE ALKENONES BIOMARKERS CAROTENOIDS DIAGENESIS ELLIS FJORD FATTY ACIDS LIPIDS MICROBIAL ACTIVITY ORGANIC GEOCHEMISTRY ORGANIC MATTER PALAEOCLIMATE PALAEOENVIRONMENT PALEOENVIRONMENT STEROLS SULFURISATION VESTFOLD HILLS HPLC > High-Performance Liquid Chromatograph NISKIN BOTTLES GAS CHROMATOGRAPHS GC-MS > Gas Chromatograph/Mass Spectrometry FIELD SURVEYS FIELD INVESTIGATION CONTINENT > ANTARCTICA > GEOGRAPHIC REGION > POLAR |
description |
--- Public Summary from Project --- The lakes and fjords of the Vestfold Hills region of Antarctica provide unique ecosystems for studying environmental changes in Antarctica over the past 8000 years. Studies of the changes in organic matter composition in sediment cores provide information how the microbial and plankton communities have changed over time in response to varying chemical and physical conditions. Our study will provide new information about how the cycles of the biologically-important elements carbon and sulfur are linked and why some sediments can preserve large amounts of organic carbon. This information will be useful for studies of palaeoclimate and will also provide valuable insights into the processes that produce petroleum source rocks. From the abstracts of the referenced papers: Preserved ribosomal DNA of planktonic phototrophic algae was recovered from Holocene anoxic sediments of Ace Lake (Antarctica), and the ancient community members were identified based on comparative sequence analysis. The similar concentration profiles of DNA of haptophytes and their traditional lipid biomarkers (alkenones and alkenoates) revealed that fossil rDNA also served as quantitative biomarkers in this environment. The DNA data clearly revealed the presence of six novel phylotypes related to known alkenone and alkenoate-biosynthesising haptophytes with Isochrysis galbana UIO 102 as their closest relative. The relative abundance of these phylotypes changed as the lake chemistry, particularly salinity, evolved over time. Changes in the alkenone distributions reflect these population changes rather than a physiological response to salinity by a single halophyte. Using this novel palaeo-ecological approach of combining data from lipid biomarkers and preserved DNA, we showed that the post-glacial development of Ace Lake from freshwater basin to marine inlet and the present-day lacustrine saline system caused major qualitative and quantitative changes in the biodiversity of the planktonic populations over time. Post-glacial Ace Lake (Vestfold Hills, Antarctica), which was initially a freshwater lake and then an open marine system, is currently a meromictic basin with anoxic, sulfidic and methane-saturated bottom waters. Lipid and 16S ribosomal RNA gene stratigraphy of up to 10,400-year-old sediment core samples from the lake revealed that these environmentally induced chemical and physical changes caused clear shifts in the species composition of archaea and aerobic methanotrophic bacteria. The combined presence of lipids specific for methanogenic archaea and molecular remains of aerobic methanotrophic bacteria (13C-depleted delta8(14)-sterols and 16S rRNA genes) revealed that an active methane cycle occurred in Ace Lake during the last 3000 calendar years and that the extant methanotrophs were most likely introduced when it became a marine inlet (9400 y BP); rDNA sequences showed 100% sequence similarity with Methanosarcinales species from freshwater environments and were the source of sn-2- and sn3-hydroxyarchaeols. Archaeal phylotypes related to uncultivated Archaea associated with various marine environments were recovered from the present-day anoxic water column and sediments deposited during the meromictic and marine period. |
author2 |
VOLKMAN, JOHN K. (hasPrincipalInvestigator) VOLKMAN, JOHN K. (processor) Australian Antarctic Data Centre (publisher) |
format |
Dataset |
title |
Interaction between Carbon and Sulfur Cycles in Antarctic Stratified Lakes and Fjords |
title_short |
Interaction between Carbon and Sulfur Cycles in Antarctic Stratified Lakes and Fjords |
title_full |
Interaction between Carbon and Sulfur Cycles in Antarctic Stratified Lakes and Fjords |
title_fullStr |
Interaction between Carbon and Sulfur Cycles in Antarctic Stratified Lakes and Fjords |
title_full_unstemmed |
Interaction between Carbon and Sulfur Cycles in Antarctic Stratified Lakes and Fjords |
title_sort |
interaction between carbon and sulfur cycles in antarctic stratified lakes and fjords |
publisher |
Australian Antarctic Data Centre |
url |
https://researchdata.ands.org.au/interaction-carbon-sulfur-lakes-fjords/699540 https://data.aad.gov.au/metadata/records/ASAC_1166 http://nla.gov.au/nla.party-617536 |
op_coverage |
Spatial: northlimit=-68.47; southlimit=-68.48; westlimit=78.18; eastLimit=78.19; projection=WGS84 Temporal: From 2000-11-01 to 2000-11-30 |
long_lat |
ENVELOPE(78.188,78.188,-68.472,-68.472) ENVELOPE(78.132,78.132,-68.603,-68.603) ENVELOPE(78.18,78.19,-68.47,-68.48) |
geographic |
Ace Lake Antarctic Ellis Fjord Vestfold Vestfold Hills |
geographic_facet |
Ace Lake Antarctic Ellis Fjord Vestfold Vestfold Hills |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Australian Antarctic Data Centre |
op_relation |
https://researchdata.ands.org.au/interaction-carbon-sulfur-lakes-fjords/699540 5f6d217a-f1b5-422f-93ef-8eab7b3241e5 ASAC_1166 https://data.aad.gov.au/metadata/records/ASAC_1166 http://nla.gov.au/nla.party-617536 |
_version_ |
1766245829317754880 |
spelling |
ftands:oai:ands.org.au::699540 2023-05-15T13:46:57+02:00 Interaction between Carbon and Sulfur Cycles in Antarctic Stratified Lakes and Fjords VOLKMAN, JOHN K. (hasPrincipalInvestigator) VOLKMAN, JOHN K. (processor) Australian Antarctic Data Centre (publisher) Spatial: northlimit=-68.47; southlimit=-68.48; westlimit=78.18; eastLimit=78.19; projection=WGS84 Temporal: From 2000-11-01 to 2000-11-30 https://researchdata.ands.org.au/interaction-carbon-sulfur-lakes-fjords/699540 https://data.aad.gov.au/metadata/records/ASAC_1166 http://nla.gov.au/nla.party-617536 unknown Australian Antarctic Data Centre https://researchdata.ands.org.au/interaction-carbon-sulfur-lakes-fjords/699540 5f6d217a-f1b5-422f-93ef-8eab7b3241e5 ASAC_1166 https://data.aad.gov.au/metadata/records/ASAC_1166 http://nla.gov.au/nla.party-617536 Australian Antarctic Data Centre biota climatologyMeteorologyAtmosphere geoscientificInformation inlandWaters oceans FJORDS EARTH SCIENCE COASTAL PROCESSES SEDIMENTS PALEOCLIMATE OCEAN/LAKE RECORDS BIOGEOCHEMICAL PROCESSES SOLID EARTH GEOCHEMISTRY BACTERIA/ARCHAEA BIOLOGICAL CLASSIFICATION PHYTOPLANKTON BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > COASTAL FRESHWATER ECOSYSTEMS > LAKE/POND BIOGEOCHEMICAL CYCLES ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS ACE LAKE ALKENONES BIOMARKERS CAROTENOIDS DIAGENESIS ELLIS FJORD FATTY ACIDS LIPIDS MICROBIAL ACTIVITY ORGANIC GEOCHEMISTRY ORGANIC MATTER PALAEOCLIMATE PALAEOENVIRONMENT PALEOENVIRONMENT STEROLS SULFURISATION VESTFOLD HILLS HPLC > High-Performance Liquid Chromatograph NISKIN BOTTLES GAS CHROMATOGRAPHS GC-MS > Gas Chromatograph/Mass Spectrometry FIELD SURVEYS FIELD INVESTIGATION CONTINENT > ANTARCTICA > GEOGRAPHIC REGION > POLAR dataset ftands 2020-01-05T21:16:19Z --- Public Summary from Project --- The lakes and fjords of the Vestfold Hills region of Antarctica provide unique ecosystems for studying environmental changes in Antarctica over the past 8000 years. Studies of the changes in organic matter composition in sediment cores provide information how the microbial and plankton communities have changed over time in response to varying chemical and physical conditions. Our study will provide new information about how the cycles of the biologically-important elements carbon and sulfur are linked and why some sediments can preserve large amounts of organic carbon. This information will be useful for studies of palaeoclimate and will also provide valuable insights into the processes that produce petroleum source rocks. From the abstracts of the referenced papers: Preserved ribosomal DNA of planktonic phototrophic algae was recovered from Holocene anoxic sediments of Ace Lake (Antarctica), and the ancient community members were identified based on comparative sequence analysis. The similar concentration profiles of DNA of haptophytes and their traditional lipid biomarkers (alkenones and alkenoates) revealed that fossil rDNA also served as quantitative biomarkers in this environment. The DNA data clearly revealed the presence of six novel phylotypes related to known alkenone and alkenoate-biosynthesising haptophytes with Isochrysis galbana UIO 102 as their closest relative. The relative abundance of these phylotypes changed as the lake chemistry, particularly salinity, evolved over time. Changes in the alkenone distributions reflect these population changes rather than a physiological response to salinity by a single halophyte. Using this novel palaeo-ecological approach of combining data from lipid biomarkers and preserved DNA, we showed that the post-glacial development of Ace Lake from freshwater basin to marine inlet and the present-day lacustrine saline system caused major qualitative and quantitative changes in the biodiversity of the planktonic populations over time. Post-glacial Ace Lake (Vestfold Hills, Antarctica), which was initially a freshwater lake and then an open marine system, is currently a meromictic basin with anoxic, sulfidic and methane-saturated bottom waters. Lipid and 16S ribosomal RNA gene stratigraphy of up to 10,400-year-old sediment core samples from the lake revealed that these environmentally induced chemical and physical changes caused clear shifts in the species composition of archaea and aerobic methanotrophic bacteria. The combined presence of lipids specific for methanogenic archaea and molecular remains of aerobic methanotrophic bacteria (13C-depleted delta8(14)-sterols and 16S rRNA genes) revealed that an active methane cycle occurred in Ace Lake during the last 3000 calendar years and that the extant methanotrophs were most likely introduced when it became a marine inlet (9400 y BP); rDNA sequences showed 100% sequence similarity with Methanosarcinales species from freshwater environments and were the source of sn-2- and sn3-hydroxyarchaeols. Archaeal phylotypes related to uncultivated Archaea associated with various marine environments were recovered from the present-day anoxic water column and sediments deposited during the meromictic and marine period. Dataset Antarc* Antarctic Antarctica Research Data Australia (Australian National Data Service - ANDS) Ace Lake ENVELOPE(78.188,78.188,-68.472,-68.472) Antarctic Ellis Fjord ENVELOPE(78.132,78.132,-68.603,-68.603) Vestfold Vestfold Hills ENVELOPE(78.18,78.19,-68.47,-68.48) |