Nella Dan: AAMBER Cruise Chlorophyll a DataEntry ID: AAMBER_phyto
Abstract: The composition, size and abundance of phytoplankton and microzooplankton were measured across a transect from Prydz Bay to Australia during late March 1987. Phytoplankton populations were low, with concentrations of chlorophyll a ranging from 0.08 to 0.22 mg.m-3. Small cells predominated numerically; nanoplankton consistently represented 55 to 68% of the total cell number while picoplankton ... represented 27 to 44%. Microplankton never represented more than 3% of cells by number, but constituted 57 to 93% of the total cell volume, and accounted for most of the latitudinal variation in total volume. Small flagellates, not identifiable by light microscopy, were the most numerous cells encountered across the transect, with a five-fold increase in abundance at 47S. Numbers of diatoms (most less than 20 microns in size) increased markedly south of the Antarctic Convergence, with a strong correlation to the concentration of silica. Dinoflagellate numbers were relatively constant across the transect, although somewhat higher north of 50S. Those less than 20 microns in size were most numerous and accounted for most of the numerical variation. HPLC analysis of chlorophyll and carotenoid pigments showed a peak of peridinin which coincided with the flagellate peak at 47S, but not with observed dinoflagellates, suggesting that the flagellate peak included unrecognized dinoflagellates. Chlorophyll b and prasinoxanthin were also associated, suggesting a significant contribution by prasinophytes. Almost no cyanobacteria were observed south of the convergence, although very large numbers, which correlated with the abundance of zeaxanthin, were encountered to the north. Numbers of ciliates and tintinnids were quite variable although they followed each other closely. Numbers of both were low in the region of the Antarctic Convergence.
Data Set Citation
Dataset Originator/Creator: Wright, S.
Dataset Title: Nella Dan: AAMBER Cruise Chlorophyll a Data
Dataset Series Name: CAASM Metadata
Dataset Release Date: 2013-08-13
Dataset Publisher: Australian Antarctic Division
Dataset DOI: doi:10.4225/15/520AC6A20D74COnline Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...
Start Date: 1987-03-07Stop Date: 1987-03-23
Quality These are old data, and have been archived almost 30 years after they were collected. Some information regarding their collection has undoubtedly been lost.
Access Constraints These data are 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=AAMBER_p... when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 30 kb
Distribution Format: Excel, Word
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6232 3338
Fax: +61 3 6232 3351
Email: simon.wright at aad.gov.au
Australian Antarctic Division 203 Channel Highway
Province or State: Tasmania
Postal Code: 7050
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 1999-10-07
Last DIF Revision Date: 2017-08-24