TemperateReefBase Geonetwork Catalogue
Palaeolimnological investigations of coastal continental lakes in the Larsemann Hills
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
Simple
Identification info
- Alternate title
- Palaeolimnological investigations of coastal continental lakes in the Larsemann Hills
- Date (Publication)
- 2004-03-22
- Edition
- 1
Originator
Publisher
Principal investigator
Collaborator
Collaborator
- Name
- CAASM Metadata
- Status
- Completed
Custodian
- Topic category
-
- Biota
- Inland waters
- Oceans
Extent
))
Extent
- Description
- Temporal Coverage
Temporal extent
- TimePeriod
- 1997-10-29 1998-02-04
Extent
- Description
- Vertical Extent - Altitude
Vertical element
- Minimum value
- 5
- Maximum value
- 100
- Identifier
- urn:x-ogc:def:cs:EPSG:6499
- Name
- Vertical CS. Axis: height (H). Orientation: up. UoM: m.
- Identifier
- urn:x-ogc:def:axis:EPSG:114
- Name
- height
Extent
- Description
- Vertical Extent - Depth
Vertical element
- Minimum value
- 0.5
- Maximum value
- 34
- Identifier
- urn:x-ogc:def:cs:EPSG:6498
- Name
- Vertical CS. Axis: depth (D). Orientation: down. UoM: m.
- Identifier
- urn:x-ogc:def:axis:EPSG:113
- Name
- depth
- Title
- Salinity, depth and the structure and composition of microbial mats in continental Antarctic Lakes
- Date (Publication)
- 2004
- Citation identifier
- 49
Author
- Name
- Freshwater Biology
- Page
- 296-319
- NASA/GCMD Earth Science Keywords
-
- 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
- EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS
- EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA
- EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS
- EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > BIOLUMINESCENCE
- Keywords
-
- ABSENCE
- ALKALINITY
- ALTITUDE
- AMMONIUM
- ANTARCTICA
- AREA
- BICARBONATE
- BOLINGEN ISLANDS
- CALCIUM
- CATCHMENT
- CHLORINE
- CONDUCTIVITY
- CYANOBACTERIA
- DEPTH
- DIATOM
- DISSOLVED ORGANIC CARBON
- 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
- NASA/GCMD Earth Science Keywords
-
- FIELD SURVEYS
- FIELD INVESTIGATION
- NASA/GCMD Earth Science Keywords
-
- AMD/AU
- CEOS
- AMD
- NASA/GCMD Earth Science Keywords
-
- CONTINENT > ANTARCTICA > Larsemann Hills
- CONTINENT > ANTARCTICA > Bolingen Islands
- GEOGRAPHIC REGION > POLAR
Resource constraints
- Use limitation
- This metadata record is publicly available.
Resource constraints
- Access constraints
- licence
- Other constraints
- 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.
Resource constraints
- File type
- Portable Network Graphic
- Title
- Attribution 4.0 International (CC BY 4.0)
- Website
-
https://creativecommons.org/licenses/by/4.0/legalcode
Legal code for Creative Commons by Attribution 4.0 International license
- Use constraints
- licence
- Other constraints
- 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.
- Language
- English
- Character encoding
- UTF8
Distribution Information
Distributor
Distributor
Distributor
- Fees
- Free
- Planned available datetime
- 2004-03-22T00:00:00
Distributor
- Fees
- Free
- Planned available datetime
- 2004-03-22T00:00:00
- Units of distribution
- kb
- Transfer size
- 28
- Distribution format
-
- excel
- Units of distribution
- kb
- Transfer size
- 402
- Distribution format
-
- OnLine resource
-
GET DATA
Download point for the data
- OnLine resource
-
PROJECT HOME PAGE
Micromat Project
- OnLine resource
-
PROJECT HOME PAGE
Public information for ASAC project 2112
- OnLine resource
-
VIEW RELATED INFORMATION > PUBLICATIONS
Download point for the publication - AAD only
- OnLine resource
-
VIEW RELATED INFORMATION
Citation reference for this metadata record and dataset
Resource lineage
- Statement
- The dates provided in temporal coverage are approximate only, and represent the dates of field data collection rather than laboratory analysis.
- Hierarchy level
- Dataset
- Maintenance and update frequency
- As needed
- Maintenance note
- 2008-04-18 - record updated by Dave Connell. 2015-09-08 - record updated by Dave Connell. Basic updates.
Metadata
- Metadata identifier
- string/ASAC_2112
- Language
- English
- Character encoding
- UTF8
Author
Sponsor
Owner
Type of resource
- Resource scope
- Dataset
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 4b99fd3c-2fc2-482f-b4af-a7d726fff51d
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Date (Last Revision)
- 2015-11-29T18:22:21
Identifier
- Description
- metadata.extraction_date
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 8.6
- Metadata linkage
-
http://data.aad.gov.au/metadata/records/ASAC_2112
Point of truth for the metadata record
- Date info (Creation)
- 2000-08-11T00:00:00
- Date info (Last Update)
- 2017-04-26
Metadata standard
- Title
- ISO 19115-3
- Edition
- 2014
- Other citation details
- Version 1
- Title
- DIF to ISO 19115-1 Profile
Overviews
Spatial extent
Provided by
