[Parameters: Topic='TERRESTRIAL HYDROSPHERE', Term='WATER QUALITY/WATER CHEMISTRY', Variable_Level_1='LIGHT TRANSMISSION']
Functional dynamics of the microbial loop in saline lakes of the Vestfold HillsEntry ID: ASAC_919
Abstract: Metadata record for data expected from ASAC Project 919.
See the link below for public details on this project.
The plankton dynamics of Ace Lake, a saline, meromictic basin in the Vestfold Hills, eastern Antarctica was studied between December 1995 and February 1997. The lake supported two distinct plankton communities; an aerobic microbial community in the upper oxygenated mixolimnion and an ... anaerobic microbial community in the lower anoxic monimolimnion. Phytoplankton development was limited by nitrogen availability. Soluble reactive phosphorus was never limiting. Chlorophyll a concentrations in the mixolimnion ranged between 0.3 and 4.4 micrograms per litre during the study period and a deep chlorophyll maximum persisted throughout the year below the chemo/oxycline. Bacterioplankton abundance showed considerable seasonal variation related to light and substrate availability. Autotrophic bacterial abundance ranged between 0.02 and 8.94 x 10 to the 8 per litre and heterotrophic bacterial abundance between 1.26 and 72.8 x 10 to the 8 per litre throughout the water column. the mixolimnion phtyoplankton was dominated by phytoflagellates, in particular Pyramimonas gledicola. P. geldicola remained active for most of the year by virtue of its mixotrophic behaviour. Photosynthetic dinoflagellates occurred during the austral summer, but the entire population encysted for the winter. Two communities of heterotrophic flagellates were apparent; a community living in the upper monimolimnion and a community living in the aerobic mixolimnion. Both exhibited different seasonal dynamics. The cliliate community was dominated by the autotroph Mesodinium rubrum. The abundance of M. rubrum peaked in summer. A proportion of the population encysted during winter. Only one other ciliate, Euplotes sp., occurred regularly. Two species of Metazoa occurred in the mixolimnion; a calanoid copepod (Paralabidocera antarctica) and a rotifer (Notholca sp.). However, there was no evidence of grazing pressure on the microbial community. In common with most other Antarctic lakes, Ace Lake appears to be driven by 'bottom-up' forces.
The fields in this dataset are:
Ash free dry weight
Bacterial Production Leucine
Bacterial Production Thymidine
Dissolved Organic Carbon
Intrinsic Growth Rate
Mesodinium rubrum cysts
Paralabidocera antarctica copepodid
Paralabidocera antarctica naupliar
Particulate Organic Carbon
Soluble Reactive Phosphorus
Data Set Citation
Dataset Originator/Creator: Laybourn-Parry, J. and Bell, E.M.
Dataset Title: Functional dynamics of the microbial loop in saline lakes of the Vestfold Hills
Dataset Series Name: CAASM Metadata
Dataset Release Date: 2002-02-18
Dataset Publisher: Australian Antarctic Data Centre
Dataset DOI: doi:10.4225/15/585b5845a48b9Online Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...
Start Date: 1995-12-01Stop Date: 1997-02-28
TERRESTRIAL HYDROSPHERE > SNOW/ICE > ICE DEPTH/THICKNESS
TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER FEATURES > LAKES/RESERVOIRS
TERRESTRIAL HYDROSPHERE > SURFACE WATER > SURFACE WATER PROCESSES/MEASUREMENTS > WATER DEPTH
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CHLOROPHYLL
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CONDUCTIVITY
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > DISSOLVED GASES
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > LIGHT TRANSMISSION
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > OXYGEN
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > WATER TEMPERATURE
BIOLOGICAL CLASSIFICATION > PROTISTS > FLAGELLATES
BIOLOGICAL CLASSIFICATION > PROTISTS > CILIATES
BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS
BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA
BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS
BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON
BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON
OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL
BIOSPHERE > ECOSYSTEMS > FRESHWATER ECOSYSTEMS > LAKE/POND > SALINE LAKES
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > TROPHIC DYNAMICS
Access Constraints These data are publicly available for download at the provided URL.
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_919 when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 296 kb
Distribution Format: Excel
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +44 (0117) 3314120
Email: Jo.Laybourn-Parry at bristol.ac.uk
University of Bristol School of Geographical Sciences University Road
Province or State: Bristol
Postal Code: BS8 1SS
Country: UNITED KINGDOM
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Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2000-08-08
Last DIF Revision Date: 2017-08-23