Data

The relative abundance (%) of planktonic foraminifera over time in core MD032607, located off the coast South Australia

Australian Ocean Data Network
Spooner, Michelle ; De Deckker, Patrick
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=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/5f27f740-07fc-11dc-92a7-00188b4c0af8&rft.title=The relative abundance (%) of planktonic foraminifera over time in core MD032607, located off the coast South Australia&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/5f27f740-07fc-11dc-92a7-00188b4c0af8&rft.description=The advent of deep-sea drilling in the 1950's prompted the use of planktonic foraminifera (unicellular protozans) as palaeoceanographic indicators. They provide a natural archive of past environmental changes due to their global distribution, their prolific productivity and sensitivity to environmental variations.The highest species abundance of foraminifera in core MD032607 was recorded by Globigerina bulloides (~45%) during the penultimate glacial period (MIS 6) and, generally, was the most abundant with an average abundance of 19.5%. The dominance of the sub-polar, transitional species, Ga. bulloides in this core suggests the influence of cold, nutrient-rich water during certain isotopic stages. Conversely, the dominant warm and oligotrophic species Globigerinoides ruber recorded its lowest abundance in Marine Isotope Stage (MIS) 6, and is totally removed from the record (0%) at 146K, 142K, and 139K yrs BP.Maintenance and Update Frequency: notPlannedStatement: Foraminifera were identified accurately to a species level, with an average of 429 individuals picked and identified per sample. Relative species abundances are calculated as a percentage of the total count. Parameters: Age of core (yrs BP), relative abundance of planktonic foraminifera assemblages (%).Statement: Counts of planktonic foraminifera were made on splits of the >150µm fractions to provide a base level for ecological counts, removing small juvenile and possibly unidentifiable foraminifera. Each sample was split by an Otto-micro splitter until ~400 species were present in the final split.&rft.creator=Spooner, Michelle &rft.creator=De Deckker, Patrick &rft.date=2007&rft.coverage=137.41028,-36.96743 137.41148,-36.96742 137.41132,-36.96820 137.41030,-36.96820 137.41028,-36.96743&rft.coverage=westlimit=137; southlimit=-40; eastlimit=137.5; northlimit=-39.5&rft.coverage=westlimit=137; southlimit=-40; eastlimit=137.5; northlimit=-39.5&rft.coverage=uplimit=2034; downlimit=2034&rft.coverage=uplimit=2034; downlimit=2034&rft_rights=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/2.5/au/&rft_rights=The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).&rft_subject=biota&rft_subject=POPULATION DYNAMICS&rft_subject=EARTH SCIENCE&rft_subject=BIOSPHERE&rft_subject=ECOLOGICAL DYNAMICS&rft_subject=SPECIES/POPULATION INTERACTIONS&rft_subject=FORAMINIFERS&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=PROTISTS&rft_subject=AMOEBOIDS&rft_subject=age_of_core&rft_subject=taxonomic_group_count&rft.type=dataset&rft.language=English Access the data
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The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).

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Brief description

The advent of deep-sea drilling in the 1950's prompted the use of planktonic foraminifera (unicellular protozans) as palaeoceanographic indicators. They provide a natural archive of past environmental changes due to their global distribution, their prolific productivity and sensitivity to environmental variations.The highest species abundance of foraminifera in core MD032607 was recorded by Globigerina bulloides (~45%) during the penultimate glacial period (MIS 6) and, generally, was the most abundant with an average abundance of 19.5%. The dominance of the sub-polar, transitional species, Ga. bulloides in this core suggests the influence of cold, nutrient-rich water during certain isotopic stages. Conversely, the dominant warm and oligotrophic species Globigerinoides ruber recorded its lowest abundance in Marine Isotope Stage (MIS) 6, and is totally removed from the record (0%) at 146K, 142K, and 139K yrs BP.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: Foraminifera were identified accurately to a species level, with an average of 429 individuals picked and identified per sample. Relative species abundances are calculated as a percentage of the total count. Parameters: Age of core (yrs BP), relative abundance of planktonic foraminifera assemblages (%).
Statement: Counts of planktonic foraminifera were made on splits of the >150µm fractions to provide a base level for ecological counts, removing small juvenile and possibly unidentifiable foraminifera. Each sample was split by an Otto-micro splitter until ~400 species were present in the final split.

Notes

Credit
The Australian National University (ANU)
Credit
Funded by The National Oceans Office (NOO)
Credit
Funded by The Australian Research Council (ARC)
Credit
Funded by The French Polar Institute
Credit
Funded by The Australian Institute of Nuclear Science Engineering (AINSE)
Credit
Funded by The Murray Darling Basin Commission
Purpose
To reconstruct the faunal assemblages of planktonic foraminifera through time and to give insight into the palaeoceanography of the core location

Issued: 22 03 2007

Data time period: 2003-01-01 to 2003-01-01

This dataset is part of a larger collection

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137.41028,-36.96743 137.41148,-36.96742 137.41132,-36.9682 137.4103,-36.9682 137.41028,-36.96743

137.41088,-36.96781

137.5,-39.5 137.5,-40 137,-40 137,-39.5 137.5,-39.5

137.25,-39.75

text: westlimit=137; southlimit=-40; eastlimit=137.5; northlimit=-39.5

text: uplimit=2034; downlimit=2034

Subjects
AMOEBOIDS | BIOLOGICAL CLASSIFICATION | BIOSPHERE | EARTH SCIENCE | ECOLOGICAL DYNAMICS | Foraminifers | Population Dynamics | PROTISTS | SPECIES/POPULATION INTERACTIONS | age_of_core | biota | taxonomic_group_count |

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Other Information
(ANU_Spooner_MD032607_3_data.xls)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/5f27f740-07fc-11dc-92a7-00188b4c0af8/attachments/ANU_Spooner_MD032607_3_data.xls

global : 1bca5f00-07fd-11dc-92a7-00188b4c0af8

Identifiers
  • global : 5f27f740-07fc-11dc-92a7-00188b4c0af8