Functional dynamics of the microbial loop in saline lakes of the Vestfold Hills
Entry ID: ASAC_919

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Summary
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 sline, 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 dinoflaggelates 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:
Ace Lake
Aerobic monimolimnion
Ammonia
Ammonium
Ash free dry weight
Autotrophic Bacteria
Bacterial Production Leucine
Bacterial Production Thymidine
Biomass
Carbon
Cell
Chlorophyll a
Concentration
Copepods
Date
Date Code
Depth
Diatoms
Dinoflagellates
Dissolved Organic Carbon
Dissolved Oxygen
Doubling
Generation Time
Heterotrophic Bacteria
Heterotrophic Nanoflagellates
Ice Thickness
Intrinsic Growth Rate
Julian Day
Julian Month
Mesodinium rubrum
Mesodinium rubrum cysts
Mixolimnion
Monimolimnion
Nauplii
Nitrate
Nitrite
Notholca sp.
Other Ciliates
Oxygenated strata
Paralabidocera antarctica copepodid
Paralabidocera antarctica naupliar
Particulate Organic Carbon
Phosphate
Phototrophic Nanoflagellates
Salinity
Season
Soluble Reactive Phosphorus
Total Ciliates
Water Temperature

Related URL
Link: GET DATA
Description: Download page for Australian Antarctic Data Centre


Link: VIEW PROJECT HOME PAGE
Description: Public information for ASAC project 919


Link: VIEW RELATED INFORMATION
Description: Citation reference for this metadata record and dataset


Geographic Coverage
 N: -68.4733 S: -68.4733  E: 78.185  W: 78.185

Temporal Coverage
Start Date: 1995-12-01
Stop Date: 1997-02-28


Location Keywords
CONTINENT > ANTARCTICA > Vestfold Hills
CONTINENT > ANTARCTICA > Ace Lake
GEOGRAPHIC REGION > POLAR


Science Keywords
TERRESTRIAL HYDROSPHERE >SNOW/ICE >ICE DEPTH/THICKNESS    [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER >LAKES    [Definition]
TERRESTRIAL HYDROSPHERE >SURFACE WATER >WATER DEPTH    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >CHLOROPHYLL    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >CONDUCTIVITY    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >DISSOLVED GASES    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >LIGHT TRANSMISSION    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >OXYGEN    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >WATER TEMPERATURE    [Definition]
BIOLOGICAL CLASSIFICATION >PROTISTS >FLAGELLATES    [Definition]
BIOLOGICAL CLASSIFICATION >PROTISTS >CILIATES    [Definition]
BIOLOGICAL CLASSIFICATION >PROTISTS >DIATOMS    [Definition]
BIOLOGICAL CLASSIFICATION >BACTERIA/ARCHAEA    [Definition]
BIOLOGICAL CLASSIFICATION >PLANTS >MICROALGAE >DIATOMS
BIOSPHERE >AQUATIC ECOSYSTEMS >PLANKTON >PHYTOPLANKTON    [Definition]
BIOSPHERE >AQUATIC ECOSYSTEMS >PLANKTON    [Definition]
OCEANS >OCEAN CHEMISTRY >PIGMENTS >CHLOROPHYLL    [Definition]
BIOSPHERE >AQUATIC ECOSYSTEMS >LAKES >SALINE LAKES    [Definition]
BIOSPHERE >ECOLOGICAL DYNAMICS >ECOSYSTEM FUNCTIONS >TROPHIC DYNAMICS    [Definition]


ISO Topic Category
BIOTA
ENVIRONMENT
GEOSCIENTIFIC INFORMATION
INLAND WATERS


Platform
GROUND-BASED OBSERVATIONS    [Information]


Instrument
TOC >Total Organic Carbon Analyzer    [Information]


Access Constraints
The data are available online at the url given below.


Use Constraints
This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).


Keywords
ACE LAKE
AEROBIC MONIMOLIMNION
AMMONIA
AMMONIUM
ASH
AUTOTROPHIC BACTERIA
BACTERIAL PRODUCTION LEUCINE
BACTERIAL PRODUCTION THYMIDINE
BIOMASS
CARBON
CELL
CHLOROPHYLL A
CONCENTRATION
COPEPODS
DATE
DATE CODE
DEPTH
DIATOMS
DINOFLAGELLATES
DISSOLVED ORGANIC CARBON
DISSOLVED OXYGEN
DOUBLING
GENERATION TIME
HETEROTROPHIC BACTERIA
HETEROTROPHIC NANOFLAGELLATES
ICE THICKNESS
INTRINSIC GROWTH RATE
JULIAN DAY
JULIAN MONTH
MESODINIUM RUBRUM
MESODINIUM RUBRUM CYSTS
MIXOLIMNION
MONIMOLIMNION
NAUPLII
NITRATE
NITRITE
NOTHOLCA SP.
OTHER CILIATES
OXYGENATED STRATA
PARALABIDOCERA ANTARCTICA COPEPODID
PARALABIDOCERA ANTARCTICA NAUPLIAR
PARTICULATE ORGANIC CARBON
PHOSPHATE
PHOTOTROPHIC NANOFLAGELLATES
SALINITY
SEASON
SRP
TOTAL CILIATES
WATER TEMPERATURE


Data Set Progress
COMPLETE


Originating Center
University of Nottingham


Data Center
Australian Antarctic Data Centre, Australia    [Information]
Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: metadata at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City: Kingston
Province or State: Tasmania
Postal Code: 7050
Country: Australia


Personnel
JOHANNA LAYBOURN-PARRY
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Role: INVESTIGATOR
Phone: +44 (0117) 3314120
Email: Jo.Laybourn-Parry at bristol.ac.uk
Contact Address:
University of Bristol
School of Geographical Sciences
University Road
City: Clifton
Province or State: Bristol
Postal Code: BS8 1SS
Country: UNITED KINGDOM


ELANOR M BELL
Role: TECHNICAL CONTACT
Phone: +49 0 331 977 1907
Fax: +49 0 331 977 1948
Email: ebell at rz.uni-potsdam.de
Contact Address:
Universität Potsdam
Maulbeerallee 2
Institut für Biochemie und Biologie
City: Potsdam
Postal Code: D-14469
Country: Germany


Publications/References
Bell, E.M. and Laybourn-Parry, J. (1999) Annual plankton dynamics in an Antarctic saline lake. Freshwater Biology, 41: 507-219

Laybourn-Parry, J., Bell, E.M., Roberts, E.C. (2000) Protozoan growth rates in Antarctic lakes. Polar Biology, 23: 445-451

Creation and Review Dates
DIF Creation Date: 2000-08-08
Last DIF Revision Date: 2014-08-29

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