Data

Nella Dan: AAMBER Cruise Chlorophyll a Data

Australian Antarctic Division
Wright, S. ; WRIGHT, SIMON
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/15/520AC6A20D74C&rft.title=Nella Dan: AAMBER Cruise Chlorophyll a Data&rft.identifier=10.4225/15/520AC6A20D74C&rft.publisher=Australian Antarctic Division&rft.description=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were low in the region of the Antarctic Convergence.Progress Code: completedStatement: These are old data, and have been archived almost 30 years after they were collected. Some information regarding their collection has undoubtedly been lost.&rft.creator=Wright, S. &rft.creator=WRIGHT, SIMON &rft.date=1999&rft.coverage=westlimit=69.60937; southlimit=-70; eastlimit=90; northlimit=-61.68987&rft.coverage=westlimit=69.60937; southlimit=-70; eastlimit=90; northlimit=-61.68987&rft_rights=These data are publicly available for download from the provided URL.&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAMBER_phyto when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=biota&rft_subject=oceans&rft_subject=EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON&rft_subject=EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL&rft_subject=EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL&rft_subject=EARTH SCIENCE > OCEANS > OCEAN OPTICS > CHLOROPHYLL > CHLOROPHYLL CONCENTRATION&rft_subject=EARTH SCIENCE > OCEANS > OCEAN OPTICS > CHLOROPHYLL&rft_subject=AAMBER&rft_subject=Chlorophyll a&rft_subject=PLANKTON NETS&rft_subject=SHIPS&rft_subject=CEOS&rft_subject=AMD&rft_subject=AMD/AU&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=GEOGRAPHIC REGION > POLAR&rft_subject=CONTINENT > ANTARCTICA > Prydz Bay&rft.type=dataset&rft.language=English Access the data
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Attribution 4.0 International (CC BY 4.0)
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These data are publicly available for download from the provided URL.

This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAMBER_phyto when using these data.

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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.

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Progress Code: completed
Statement: These are old data, and have been archived almost 30 years after they were collected. Some information regarding their collection has undoubtedly been lost.

Data time period: 1987-03-07 to 1987-03-23

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90,-61.68987 90,-70 69.60937,-70 69.60937,-61.68987 90,-61.68987

79.804685,-65.844935

text: westlimit=69.60937; southlimit=-70; eastlimit=90; northlimit=-61.68987

Subjects
AAMBER | AMD | AMD/AU | CEOS | CONTINENT > ANTARCTICA > Prydz Bay | Chlorophyll a | EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON | EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CHLOROPHYLL | EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL | EARTH SCIENCE > OCEANS > OCEAN OPTICS > CHLOROPHYLL | EARTH SCIENCE > OCEANS > OCEAN OPTICS > CHLOROPHYLL > CHLOROPHYLL CONCENTRATION | GEOGRAPHIC REGION > POLAR | OCEAN > SOUTHERN OCEAN | PLANKTON NETS | SHIPS | biota | oceans |

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Download point for the data (GET DATA > DIRECT DOWNLOAD)

url : https://data.aad.gov.au/eds/3664/download

Citation reference for this metadata record and dataset (VIEW RELATED INFORMATION)

url : http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAMBER_phyto

Identifiers
ACN 633 798 857