The fate of primary production in Antarctic sea ice: the role of metazoan grazers.Entry ID: ASAC_1328
Abstract: Crustaceans are an important component of the Antarctic marine ecosystem. Large numbers live in or close to the sea-ice cover, using it as a refuge from predation and a source of food. However, the impact of these animals on algae that grows in the sea ice is unknown. This study is examining the diets and grazing rates of crustaceans in the Antarctic sea-ice ecosystem. These results will aid our ... understanding of the fate of algal production in sea-ice and will enable the construction of realistic carbon budgets for this ecosystem.
This project was commenced in July 2002. A five-week voyage was undertaken on the RV Aurora Australis in October and November 2002, in the vicinity of the Mertz Glacier. Pack ice cores and sub-ice water samples were collected from 8 locations, with 3 to 5 samples of each type collected per site. The cores were sectioned in the field, melted and treated for further analysis. All samples were either preserved or frozen, depending on future requirements, and returned to Australia. Sea ice cores were processed for a range of analyses including microscopy, lipid class and fatty acid determination and stable isotope analysis. A physical description of the pack ice environment (ice type, ice thickness, snow cover, temperature profiles, salinity profiles) was also compiled.
A second sampling of the pack ice occurred in Sept-Oct 2003. To date, the salinity and temperature profiles of the pack ice cores have been described and a database compiled of the physical description of the region. A large number of samples (10 sites; 5 ice/water/animal samples per site) was collected and analysis has begun of stable isotopic signatures, fatty acids, chlorophyll a and species identifications. Crustaceans have been sorted under the microscope and initial descriptions of gut contents begun.
The third successful sampling trip was to the fast ice surrounding Davis Station during the 2003/04 summer. Two sites were sampled regularly, with a full suite of analyses undertaken. This will provide a temporal component to the project to complement the spatial approach used in the pack ice. Analysis of the fast ice samples is ongoing.
Two more sampling trips were carried out during the 2004/05 season. The first in the pack ice offshore from Casey and the second in the fast ice at Casey. The same suite of analyses as listed above was carried out and analyses are ongoing.
The download file contains five excel spreadsheets, as well as a word document which further explains data collection.
Data Set Citation
Dataset Release Date: 2012-12-20
Start Date: 2002-10-29Stop Date: 2005-02-28
OCEANS > SEA ICE > PACK ICE
OCEANS > SEA ICE
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES > ARTHROPODS > CRUSTACEANS
BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS
BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS
BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON > ZOOPLANKTON
OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL
BIOSPHERE > AQUATIC ECOSYSTEMS > PELAGIC HABITAT
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOGEOCHEMICAL CYCLES
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > NUTRIENT CYCLING
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > TROPHIC DYNAMICS
Quality See the download file for more information.
Access Constraints These data are publicly available for download from 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_1328 when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 159 kb
Distribution Format: Excel, Word
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6226 2522
Fax: +61 3 6226 2745
Email: k.swadling at utas.edu.au
School of Zoology University of Tasmania GPO BOX 252-05
Province or State: Tasmania
Postal Code: 7001
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2001-04-09
Last DIF Revision Date: 2012-12-20