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Citation
Dehairs, F. (2008) Spring Phytoplankton Assemblages in the Southern Ocean Between Australia and Antarctica, Ver. 1, Australian Antarctic Data Centre - doi:10.4225/15/55E91CA3B583A, Accessed: 2021-12-03
Title
Spring Phytoplankton Assemblages in the Southern Ocean Between Australia and Antarctica
Data Centre
Australian Antarctic Data Centre, Australia
DOI
doi:10.4225/15/55E91CA3B583A
Created Date
2008-05-21
Revision Date
2021-04-09
Parent record
None

Description

This dataset comprises of an excel spreadsheet of data collected on the CLIVAR-SR3 cruise in November to December 2001. The spreadsheet contains plankton and carbon data.

From the abstract of the referenced publication:

Variations of phytoplankton assemblages were studied in November-December 2001, in surface waters of the Southern Ocean along a transect between the Sub-Antarctic Zone (SAZ) and the Seasonal Ice Zone (SIZ; 46.9-64.9 degrees S; 142-143 degrees E; CLIVAR-SR3 cruise). Two regions had characteristic but different phytoplankton assemblages. Nanoflagellates (less than 20 microns) and pico-plankton (~2 microns) occurred in similar concentrations along the transect, but were dominant in the SAZ, Sub-Antarctic Front (SAF), Polar Front Zone (PFZ) and the Inter-Polar Front Zone (IPFZ), (46.9-56.9 degrees S). Along the entire transect their average cell numbers in the upper 70 m of water column, varied from 300,000 to 1,100,000 cells per litre. Larger cells (greater than 20 microns), diatoms and dinoflagellates, were more abundant in the Antarctic Zone-South (AZ-S) and the SIZ (60.9-64.9 degrees S). In AZ-S and SIZ diatoms ranged between 270,000 and 1,200,000 cells per litre, dinoflagellates from 31,000 to 102,000 cells per litre. A diatom bloom was in progress in the AZ-S showing a peak of 1,800,000 cells per litre. Diatoms were dominated by Pseudo-nitzschia spp., Fragilariopsis spp., and Chaetoceros spp. Pseudo-nitzschia spp. outnumbered other diatoms in the AZ-S. Fragilariopsis spp. were most numerous in the SIZ. Dinoflagellates contained autotrophs (eg Prorocentrum) and heterotrophs (Gyrodinium/Gymnodinium, Protoperidinium). Diatoms and dinoflagellates contributed most to the cellular carbon: 11-25 and 17-124 micrograms of carbon per litre, respectively. Small cells dominated in the northern region characterised by the lowest N-uptake and new production of the transect. Larger diatom cells were prevalent in the southern area with higher values of N-uptake and new production. Diatom and nanoflagellate cellular carbon contents were highly correlated with one another, with primary production, and productivity related parameters. They contributed up to 75% to the total autotrophic C biomass. Diatom carbon content was significantly correlated to nitrate uptake and particle export, but not to ammonium uptake, while flagellate carbon was well correlated to ammonium uptake, but not to export. Diatoms have contributed highly to particle export along the latitudinal transect, while flagellates played a minor role in the export.

This work was completed as part of ASAC project 1343 (ASAC_1343).

The fields in this dataset are:

Station (depth, position, date, comments)
Species
Cells per millilitre
cell carbon - micrograms per litre

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Quality

Taken from the methods section of the attached paper:

Sampling Strategy
Eight CTD stations were visited cruising southwards; two stations at 63.9 degrees S (SIZ), 60.9 degrees S (SAZ) were re-visited after 11 and 17 days from the first sampling, respectively. A station at 51 degrees S was sampled for phytoplankton determination during the northbound transect. The stations at 63.9 degrees S were covered by sea ice (CTD 85: ~40-45%; CTD 127: ~25-30%) at the time of sampling. At 64.9 degrees S (CTD 122) sampling was carried out in ice-free (less than 15%) but ice-melt water.

Water samples were collected with Niskin bottles from four standard depths (5, 25, 50 and 70m) at all sites except at 46.9 and 48.8 degrees S (CTD 15 and 23) where they were collected at 10, 30, and 60 m. The same standard depths were chosen for the assessment of new production. At stations between 53.7 and 64.9 degrees S (CTD 50-73, 85-122) additional samples were obtained from 90-100 m. At CTD 50, teh depth of 150 m was included, and at CTD 64, the depths of 130, 170, and 200 m were also sampled. Depths below 70 m were sampled at the occasion of collecting diatoms and particles exported from the mixed layer. Since the mean mixed layer depth was 70 m, we mainly concentrate on phytoplankton data analysis from the upper 70 m water column.

Access

These data are publicly available for download from the provided URL.

These data can also be accessed via the Biodiversity database at the provided URL.

Temporal Coverages

Spatial Coverages

Science Keywords

Additional Keywords

  • plankton
  • phytoplankton
  • carbon
  • CTD
  • Aurora Australis
  • assemblages

Locations

  • OCEAN > SOUTHERN OCEAN
  • CONTINENT > ANTARCTICA
  • GEOGRAPHIC REGION > POLAR

Platforms

  • SHIPS
  • R/V Aurora Australis

Instruments

  • Conductivity, Temperature, Depth
  • NISKIN BOTTLES

Researchers

  • dehairs, frank (INVESTIGATOR,TECHNICAL CONTACT)
  • kopczynska, elisabeth (TECHNICAL CONTACT)
  • connell, dave (DIF AUTHOR)

Use 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 at the provided http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_1343_phytoplankton when using these data.

Creative Commons License