Distribution of Modern Benthic Foraminifera of McMurdo Sound, Antarctica
This thesis presents the results of a study of benthic foraminifera from McMurdo Sound, Antarctica. The sound is 50 km across and more than 900 m deep, and is ice-covered for at least 9 months of the year. However, salinity and temperature of the bottom waters are constant (35 per mil and -1.8 degre...
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ftvictoriauwfig:oai:figshare.com:article/16945603 2023-05-15T13:35:14+02:00 Distribution of Modern Benthic Foraminifera of McMurdo Sound, Antarctica Ward, Barbara Lynne 1984-01-01T00:00:00Z https://doi.org/10.26686/wgtn.16945603.v1 https://figshare.com/articles/thesis/Distribution_of_Modern_Benthic_Foraminifera_of_McMurdo_Sound_Antarctica/16945603 unknown doi:10.26686/wgtn.16945603.v1 https://figshare.com/articles/thesis/Distribution_of_Modern_Benthic_Foraminifera_of_McMurdo_Sound_Antarctica/16945603 Author Retains Copyright Earth Sciences not elsewhere classified Foraminifera Paleontology Calcareous species Antarctic regions Agglutinated species School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260112 Palaeontology Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy Text Thesis 1984 ftvictoriauwfig https://doi.org/10.26686/wgtn.16945603.v1 2021-11-11T00:04:57Z This thesis presents the results of a study of benthic foraminifera from McMurdo Sound, Antarctica. The sound is 50 km across and more than 900 m deep, and is ice-covered for at least 9 months of the year. However, salinity and temperature of the bottom waters are constant (35 per mil and -1.8 degrees C). Sea floor sediment is mainly fine sand and mud with a little ice-rafted gravel. The aim of the study was to document the distribution of living and dead foraminifera and to determine the factor(s) controlling it. The twenty-six sites in water from 76 to 856m deep were sampled by gravity corer and grab, and nearly 40,000 specimens (2334 living and 36,875 dead) were identified. Three present day assemblages can be recognised: 1. Shallow open water assemblage (SWA): Trochammina glabra, Cribrostomoides jeffreysii, Trifarina earlandi, Ehrenbergina glabra, Fursenkoina earlandi and Globocassidulina crassa. 2. Deep open water assemblage (DWA): Reophax pilulifer, Reophax subdentaliniformis, Portotrochammina antarctica, Textularia antarctica and Miliammina arenacea. 3. Harbour/enclosed basin assemblage (HA): Reophax subdentaliniformis, Portotrochammina antarctica, Textularia antarctica, Fursenkoina earlandi and Globocassidulina crassa. The composition of the assemblages is controlled largely by calcium carbonate compensation depth (CCD). Calcareous species are abundant and varied (84 calcareous species) in the SWA above 620m, but are virtually absent from the DWA, which is found in deeper water. The dominance of agglutinated foraminifera in the HA indicates an even shallower CCD (about 270m) in restricted coastal settings. Death assemblages have a similar species diversity to corresponding life assemblages and are reasonably representative of them, except for the 200m zone above the offshore CCD, where death assemblages are depleted in calcareous taxa. The diversity of the agglutinated component of each assemblage remains nearly constant in all habitats and at all water depths, even though shallow water samples include a ... Thesis Antarc* Antarctic Antarctica McMurdo Sound Open Access Victoria University of Wellington / Te Herenga Waka Antarctic Marsden ENVELOPE(66.067,66.067,-67.867,-67.867) McMurdo Sound |
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Open Access Victoria University of Wellington / Te Herenga Waka |
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unknown |
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Earth Sciences not elsewhere classified Foraminifera Paleontology Calcareous species Antarctic regions Agglutinated species School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260112 Palaeontology Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy |
spellingShingle |
Earth Sciences not elsewhere classified Foraminifera Paleontology Calcareous species Antarctic regions Agglutinated species School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260112 Palaeontology Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy Ward, Barbara Lynne Distribution of Modern Benthic Foraminifera of McMurdo Sound, Antarctica |
topic_facet |
Earth Sciences not elsewhere classified Foraminifera Paleontology Calcareous species Antarctic regions Agglutinated species School: School of Geography Environment and Earth Sciences 049999 Earth Sciences not elsewhere classified Marsden: 260112 Palaeontology Degree Discipline: Geology Degree Level: Doctoral Degree Name: Doctor of Philosophy |
description |
This thesis presents the results of a study of benthic foraminifera from McMurdo Sound, Antarctica. The sound is 50 km across and more than 900 m deep, and is ice-covered for at least 9 months of the year. However, salinity and temperature of the bottom waters are constant (35 per mil and -1.8 degrees C). Sea floor sediment is mainly fine sand and mud with a little ice-rafted gravel. The aim of the study was to document the distribution of living and dead foraminifera and to determine the factor(s) controlling it. The twenty-six sites in water from 76 to 856m deep were sampled by gravity corer and grab, and nearly 40,000 specimens (2334 living and 36,875 dead) were identified. Three present day assemblages can be recognised: 1. Shallow open water assemblage (SWA): Trochammina glabra, Cribrostomoides jeffreysii, Trifarina earlandi, Ehrenbergina glabra, Fursenkoina earlandi and Globocassidulina crassa. 2. Deep open water assemblage (DWA): Reophax pilulifer, Reophax subdentaliniformis, Portotrochammina antarctica, Textularia antarctica and Miliammina arenacea. 3. Harbour/enclosed basin assemblage (HA): Reophax subdentaliniformis, Portotrochammina antarctica, Textularia antarctica, Fursenkoina earlandi and Globocassidulina crassa. The composition of the assemblages is controlled largely by calcium carbonate compensation depth (CCD). Calcareous species are abundant and varied (84 calcareous species) in the SWA above 620m, but are virtually absent from the DWA, which is found in deeper water. The dominance of agglutinated foraminifera in the HA indicates an even shallower CCD (about 270m) in restricted coastal settings. Death assemblages have a similar species diversity to corresponding life assemblages and are reasonably representative of them, except for the 200m zone above the offshore CCD, where death assemblages are depleted in calcareous taxa. The diversity of the agglutinated component of each assemblage remains nearly constant in all habitats and at all water depths, even though shallow water samples include a ... |
format |
Thesis |
author |
Ward, Barbara Lynne |
author_facet |
Ward, Barbara Lynne |
author_sort |
Ward, Barbara Lynne |
title |
Distribution of Modern Benthic Foraminifera of McMurdo Sound, Antarctica |
title_short |
Distribution of Modern Benthic Foraminifera of McMurdo Sound, Antarctica |
title_full |
Distribution of Modern Benthic Foraminifera of McMurdo Sound, Antarctica |
title_fullStr |
Distribution of Modern Benthic Foraminifera of McMurdo Sound, Antarctica |
title_full_unstemmed |
Distribution of Modern Benthic Foraminifera of McMurdo Sound, Antarctica |
title_sort |
distribution of modern benthic foraminifera of mcmurdo sound, antarctica |
publishDate |
1984 |
url |
https://doi.org/10.26686/wgtn.16945603.v1 https://figshare.com/articles/thesis/Distribution_of_Modern_Benthic_Foraminifera_of_McMurdo_Sound_Antarctica/16945603 |
long_lat |
ENVELOPE(66.067,66.067,-67.867,-67.867) |
geographic |
Antarctic Marsden McMurdo Sound |
geographic_facet |
Antarctic Marsden McMurdo Sound |
genre |
Antarc* Antarctic Antarctica McMurdo Sound |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Sound |
op_relation |
doi:10.26686/wgtn.16945603.v1 https://figshare.com/articles/thesis/Distribution_of_Modern_Benthic_Foraminifera_of_McMurdo_Sound_Antarctica/16945603 |
op_rights |
Author Retains Copyright |
op_doi |
https://doi.org/10.26686/wgtn.16945603.v1 |
_version_ |
1766063176098512896 |