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The fate of primary production in Antarctic sea ice: the role of metazoan grazers.

Entry ID: ASAC_1328

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Summary

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.

Related URL

Link: GET DATA

Description: Download point for the data

Service Citation

Originators: NASA Ames Research Center, University of Montana
Title: Terrestrial Observation and Prediction System (TOPS)
Provider: NASA Ames Research Center
URL: http://ecocast.arc.nasa.gov/

Service Keywords

HAZARDS MANAGEMENT >HAZARDS MITIGATION

HAZARDS MANAGEMENT >HAZARDS PLANNING

Science Keywords

AGRICULTURE >AGRICULTURAL PLANT SCIENCE >CROPPING SYSTEMS

AGRICULTURE >FOREST SCIENCE >FOREST PROTECTION

ISO Topic Category

FARMING

BIOTA

Platform

TERRA > Earth Observing System, TERRA (AM-1)

AQUA > Earth Observing System, AQUA

Instrument

MODIS > Moderate-Resolution Imaging Spectroradiometer

Project

ESIP > Earth Science Information Partners Program

REASON > Research, Education, and Applications Solution Network

NASA ACCESS > NASA's Advancing Collaborative Connections for Earth System Science

Ancillary Keywords

REASON

Prediction Systems

Service Provider

NASA/ARC/ECOCAST > Ecological Forecasting Laboratory, Ames Research Center, NASA

Service Organization URL: http://ecocast.arc.nasa.gov/

Service Provider Personnel
Name: DR. RAMAKRISHNA R. NEMANI Email: rama.nemani at nasa.gov Contact Address: Biospheric Sciences Branch NASA Ames Research Center MS 242-4 City: Moffett Field Province or State: CA Postal Code: 94087 Country: USA

Distribution

Distribution Media: online www, ftp

Distribution Format: ascii, excel

Fees: none

Personnel

PAUL F. SCHUSTER

Role: INVESTIGATOR

Email: pschuste at usgs.gov

Contact Address:

U.S. Geological Survey

City: Boulder

Province or State: Colorado

Country: USA

Publications/References

Schuster, P.F., D.P. Krabbenhoft, D.L. Naftz, L.D. Cecil, M.L. Olson,
J.F. Dewild, D.D. Susong, J.R. Green, and M.L. Abbott, 2002, Atmospheric Mercury Deposition during the Last 270 Years: A Glacial Ice Core Record of Natural and Anthropogenic Sources Environmental Science and Technology, Volume 36, No. 11, pp. 2303-2310.

Creation and Review Dates

DIF Creation Date: 2003-04-18

Last DIF Revision Date: 2003-04-18

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