Data

Palaeolimnological investigations of coastal continental lakes in the Larsemann Hills

Australian Antarctic Division
Hodgson, D. and Wilmotte, A. ; HODGSON, DOMINIC ; WILMOTTE, ANNICK
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://data.aad.gov.au/metadata/ASAC_2112&rft.title=Palaeolimnological investigations of coastal continental lakes in the Larsemann Hills&rft.identifier=http://data.aad.gov.au/metadata/ASAC_2112&rft.publisher=Australian Antarctic Data Centre&rft.description=1.The lakes and ponds in the Larsemann Hills and Bolingen Islands (East-Antarctica) are characterised by cyanobacteria-dominated, benthic microbial mat communities. A 56-lake dataset representing the limnological diversity among the more than 150 lakes and ponds in the region was developed to identify the nature and quantify the effects of the abiotic conditions structuring the cyanobacterial and diatom communities.2.Limnological diversity in the lakes of the Larsemann Hills and Bolingen Islands is primarily determined by salinity and salinity related variables (concentrations of major ions, conductivity and alkalinity), and variation in lake morphometry (depth, catchment and lake area). Low pigment, phosphate and nitrogen concentrations, and DOC and TOC levels in the water column of most lakes underscore the ecological success of benthic microbial mats in this region.3.Benthic communities consisted of prostrate, sometimes finely laminated mats, flake mats, epilithic and interstitial microbial mats. Mat physiognomy and chlorophyll/carotenoid ratios were strongly related to lake depth, but not to salinity.4.Morphological-taxonomic analyses revealed the presence of 27 diatom morphospecies and 34 cyanobacterial morphotypes. Mats of shallow lakes (interstitial and flake mats) and those of deeper lakes (prostrate mats) were characterized by different dominant cyanobacterial morphotypes. No relationship was found between the distribution of these morphotypes and salinity. In contrast, variation in diatom species composition was strongly related to both lake depth and salinity. Shallow ponds are mainly characterised by aerial diatoms (e.g. Diadesmis cf. perpusilla and Hantzschia spp.). In deep lakes, communities are dominated by Psammothidium abundans and Stauroforma inermis. Lakes with conductivities higher than 1.5 mS/cm become susceptible to freezing out of salts and hence pronounced salinity fluctuations. In these lakes Psammothidium abundans and Stauroforma inermis are replaced by Amphora veneta. Stomatocysts were only important in shallow freshwater lakes.5.Ice cover influences microbial mat structure and composition both directly by physical disturbance in shallow lakes and by influencing light availability in deeper lakes, as well as indirectly by generating salinity increases and promoting the development of seasonal anoxia.6.The relationship between diatom species composition and salinity and depth is statistically significant. Transfer functions based on these data can therefore be used in paleolimnological reconstruction to infer changes in the precipitation-evaporation balance in continental Antarctic lakes.These data were also collected under the auspices of the Micromat Project, Biodiversity of Microbial mats in Antarctica (see the URL below).The fields in this dataset are:LakeLake numberLocationLatitudeLongitudeAltitude (m)Area (ha)Catchment (ha)Depth (m)Distance from PlateauDistance from SeaGeologySubstratePresenceAbsencepHAlkalinityNitrateNitriteAmmoniumSilicatePhosphateOxygenSalinityTurbidityConductivitySodiumPotassiumCalciumMagnesiumChlorineSulphurBicarbonateHydrocarbonateTotal Organic CarbonDissolved Organic CarbonProgress Code: completedStatement: The dates provided in temporal coverage are approximate only, and represent the dates of field data collection rather than laboratory analysis. &rft.creator=Hodgson, D. and Wilmotte, A. &rft.creator=HODGSON, DOMINIC &rft.creator=WILMOTTE, ANNICK &rft.date=2000&rft.coverage=westlimit=75.75; southlimit=-69.5166; eastlimit=76.4; northlimit=-69.15&rft.coverage=westlimit=75.75; southlimit=-69.5166; eastlimit=76.4; northlimit=-69.15&rft.coverage=uplimit=100; downlimit=5&rft.coverage=uplimit=100; downlimit=5&rft.coverage=uplimit=34; downlimit=0.5&rft.coverage=uplimit=34; downlimit=0.5&rft_rights=These data are publicly available for download from the provided URL. A copy of the referenced publication is available for download to AAD staff only.&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2112 when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=biota&rft_subject=inlandWaters&rft_subject=oceans&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER CHARACTERISTICS > CONDUCTIVITY&rft_subject=EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER CHARACTERISTICS > pH&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA&rft_subject=EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS&rft_subject=EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > BIOLUMINESCENCE&rft_subject=ABSENCE&rft_subject=ALKALINITY&rft_subject=ALTITUDE&rft_subject=AMMONIUM&rft_subject=ANTARCTICA&rft_subject=AREA&rft_subject=BICARBONATE&rft_subject=BOLINGEN ISLANDS&rft_subject=CALCIUM&rft_subject=CATCHMENT&rft_subject=CHLORINE&rft_subject=CONDUCTIVITY&rft_subject=CYANOBACTERIA&rft_subject=DEPTH&rft_subject=DIATOM&rft_subject=DISSOLVED ORGANIC CARBON&rft_subject=GEOLOGY&rft_subject=HYDROCARBONATE&rft_subject=LAKE&rft_subject=LAKE NUMBER&rft_subject=LARSEMANN HILLS&rft_subject=LATITUDE&rft_subject=LOCATION&rft_subject=LONGITUDE&rft_subject=MAGNESIUM&rft_subject=MICROBIAL MAT&rft_subject=NITRATE&rft_subject=NITRITE&rft_subject=OXYGEN&rft_subject=PH&rft_subject=PHOSPHATE&rft_subject=POTASSIUM&rft_subject=PRESENCE&rft_subject=SALINITY&rft_subject=SILICATE&rft_subject=SODIUM&rft_subject=SUBSTRATE&rft_subject=SULPHUR&rft_subject=TOTAL ORGANIC CARBON&rft_subject=TURBIDITY&rft_subject=FIELD SURVEYS&rft_subject=FIELD INVESTIGATION&rft_subject=AMD/AU&rft_subject=CEOS&rft_subject=AMD&rft_subject=CONTINENT > ANTARCTICA > Larsemann Hills&rft_subject=CONTINENT > ANTARCTICA > Bolingen Islands&rft_subject=GEOGRAPHIC REGION > POLAR&rft.type=dataset&rft.language=English Access the data
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Attribution 4.0 International (CC BY 4.0)
https://creativecommons.org/licenses/by/4.0/legalcode

These data are publicly available for download from the provided URL. A copy of the referenced publication is available for download to AAD staff only.

This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2112 when using these data.

This metadata record is publicly available.

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Full description

1.The lakes and ponds in the Larsemann Hills and Bolingen Islands (East-Antarctica) are characterised by cyanobacteria-dominated, benthic microbial mat communities. A 56-lake dataset representing the limnological diversity among the more than 150 lakes and ponds in the region was developed to identify the nature and quantify the effects of the abiotic conditions structuring the cyanobacterial and diatom communities.

2.Limnological diversity in the lakes of the Larsemann Hills and Bolingen Islands is primarily determined by salinity and salinity related variables (concentrations of major ions, conductivity and alkalinity), and variation in lake morphometry (depth, catchment and lake area). Low pigment, phosphate and nitrogen concentrations, and DOC and TOC levels in the water column of most lakes underscore the ecological success of benthic microbial mats in this region.

3.Benthic communities consisted of prostrate, sometimes finely laminated mats, flake mats, epilithic and interstitial microbial mats. Mat physiognomy and chlorophyll/carotenoid ratios were strongly related to lake depth, but not to salinity.

4.Morphological-taxonomic analyses revealed the presence of 27 diatom morphospecies and 34 cyanobacterial morphotypes. Mats of shallow lakes (interstitial and flake mats) and those of deeper lakes (prostrate mats) were characterized by different dominant cyanobacterial morphotypes. No relationship was found between the distribution of these morphotypes and salinity. In contrast, variation in diatom species composition was strongly related to both lake depth and salinity. Shallow ponds are mainly characterised by aerial diatoms (e.g. Diadesmis cf. perpusilla and Hantzschia spp.). In deep lakes, communities are dominated by Psammothidium abundans and Stauroforma inermis. Lakes with conductivities higher than 1.5 mS/cm become susceptible to freezing out of salts and hence pronounced salinity fluctuations. In these lakes Psammothidium abundans and Stauroforma inermis are replaced by Amphora veneta. Stomatocysts were only important in shallow freshwater lakes.

5.Ice cover influences microbial mat structure and composition both directly by physical disturbance in shallow lakes and by influencing light availability in deeper lakes, as well as indirectly by generating salinity increases and promoting the development of seasonal anoxia.

6.The relationship between diatom species composition and salinity and depth is statistically significant. Transfer functions based on these data can therefore be used in paleolimnological reconstruction to infer changes in the precipitation-evaporation balance in continental Antarctic lakes.

These data were also collected under the auspices of the Micromat Project, Biodiversity of Microbial mats in Antarctica (see the URL below).

The fields in this dataset are:

Lake
Lake number
Location
Latitude
Longitude
Altitude (m)
Area (ha)
Catchment (ha)
Depth (m)
Distance from Plateau
Distance from Sea
Geology
Substrate
Presence
Absence
pH
Alkalinity
Nitrate
Nitrite
Ammonium
Silicate
Phosphate
Oxygen
Salinity
Turbidity
Conductivity
Sodium
Potassium
Calcium
Magnesium
Chlorine
Sulphur
Bicarbonate
Hydrocarbonate
Total Organic Carbon
Dissolved Organic Carbon

Lineage

Progress Code: completed
Statement: The dates provided in temporal coverage are approximate only, and represent the dates of field data collection rather than laboratory analysis.

Data time period: 1997-10-29 to 1998-02-04

This dataset is part of a larger collection

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76.4,-69.15 76.4,-69.5166 75.75,-69.5166 75.75,-69.15 76.4,-69.15

76.075,-69.3333

text: westlimit=75.75; southlimit=-69.5166; eastlimit=76.4; northlimit=-69.15

text: uplimit=100; downlimit=5

text: uplimit=34; downlimit=0.5

Subjects
ABSENCE | ALKALINITY | ALTITUDE | AMD | AMD/AU | AMMONIUM | ANTARCTICA | AREA | BICARBONATE | BOLINGEN ISLANDS | CALCIUM | CATCHMENT | CEOS | CHLORINE | CONDUCTIVITY | CONTINENT > ANTARCTICA > Bolingen Islands | CONTINENT > ANTARCTICA > Larsemann Hills | CYANOBACTERIA | DEPTH | DIATOM | DISSOLVED ORGANIC CARBON | EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA | EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS | EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS | EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > BIOLUMINESCENCE | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER CHARACTERISTICS > CONDUCTIVITY | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER CHARACTERISTICS > pH | FIELD INVESTIGATION | FIELD SURVEYS | GEOGRAPHIC REGION > POLAR | GEOLOGY | HYDROCARBONATE | LAKE | LAKE NUMBER | LARSEMANN HILLS | LATITUDE | LOCATION | LONGITUDE | MAGNESIUM | MICROBIAL MAT | NITRATE | NITRITE | OXYGEN | PH | PHOSPHATE | POTASSIUM | PRESENCE | SALINITY | SILICATE | SODIUM | SUBSTRATE | SULPHUR | TOTAL ORGANIC CARBON | TURBIDITY | biota | inlandWaters | oceans |

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Other Information
Download point for the data (GET DATA)

url : http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=1518

Micromat Project (PROJECT HOME PAGE)

url : http://www.nerc-bas.ac.uk/public/mlsd/micromat/

Public information for ASAC project 2112 (PROJECT HOME PAGE)

url : https://projects.aad.gov.au/search_projects_results.cfm?project_no=2112

Download point for the publication - AAD only (VIEW RELATED INFORMATION > PUBLICATIONS)

url : http://data.aad.gov.au/aadc/portal/download_file.cfm?file_id=4508

Citation reference for this metadata record and dataset (VIEW RELATED INFORMATION)

url : http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2112

Identifiers
  • global : ASAC_2112
ACN 633 798 857