Significance of nannoplankton in primary production of the Ross Sea, Antarctica, during the 1972 Austral Summer
During Eltanin Cruise 51 (January-February 1972), hydrographic features, phytoplankton standing crop, and primary production were determined between New Zealand and the Ross Ice Shelf. Four geographical regions with unique physical/chemical characteristics were delineated. They were the Subantarctic...
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fttexasamuniv:oai:oaktrust.library.tamu.edu:1969.1/DISSERTATIONS-187479 2023-07-16T03:53:51+02:00 Significance of nannoplankton in primary production of the Ross Sea, Antarctica, during the 1972 Austral Summer Fay, Roger Richard El-Sayed, Sayed Z. 1973 184 leaves electronic application/pdf reformatted digital https://hdl.handle.net/1969.1/DISSERTATIONS-187479 eng eng Texas A&M University. Libraries https://hdl.handle.net/1969.1/DISSERTATIONS-187479 5802152 This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. http://rightsstatements.org/vocab/InC/1.0/ Major oceanography 1973 Dissertation F282 Thesis dissertations text 1973 fttexasamuniv 2023-06-27T22:23:51Z During Eltanin Cruise 51 (January-February 1972), hydrographic features, phytoplankton standing crop, and primary production were determined between New Zealand and the Ross Ice Shelf. Four geographical regions with unique physical/chemical characteristics were delineated. They were the Subantarctic (SA), Antarctic Convergence (AC), Antarctic (AA), and Ross Ice Shelf (RIS) regions. Nannoplankton contribution to total phytoplankton standing crop (Chl a) and total primary production (C¹⁴ uptake) was measured by a fractionation process utilizing 10 (subscript "mean" symbol) mesh screens to separate the net and nannoplankton components. Mean phytoplankton standing crop values, integrated to 200 m, for the SA, AC, AA, and RIS regions were 23.62, 35.08, 51.41, and 96.37 mgChl a/m², respectively. Nannoplankton accounted for 76.2%, 88.6%, and 64.9% of the standing crop in these respective areas. A significant correlation was found between the total phytoplankton standing crop in surface samples and standing crop estimates integrated over the water column. However, no correlation was found between size competition of the surface standing crop and that of the euphotic zone. Mean estimates of total phytoplankton production in the euphotic zone for the SA, AA, and RIS regions were 5.72, 6.18, and 9.97 mg/m²/hr. Nannoplankton production remained relatively constant in these regions, accounting for 90.2%, 67.0%, and 54.0% of total production in the respective regions. The increased phytoplankton standing crop and primary production observed in waters south of the Antarctic Convergence were accounted for by increases in the net plankton fraction. Average photosynthetic indexes (PI) were calculated for the total phytoplankton and the nannoplankton fraction. Significant estimates of 0.351 (P=.01) and 0.243 (P=.1) were obtained for the total PI and nannoplankton PI, respectively. Thesis Antarc* Antarctic Antarctica Ice Shelf Ross Ice Shelf Ross Sea Texas A&M University Digital Repository Antarctic The Antarctic Austral Ross Sea Ross Ice Shelf New Zealand |
institution |
Open Polar |
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Texas A&M University Digital Repository |
op_collection_id |
fttexasamuniv |
language |
English |
topic |
Major oceanography 1973 Dissertation F282 |
spellingShingle |
Major oceanography 1973 Dissertation F282 Fay, Roger Richard Significance of nannoplankton in primary production of the Ross Sea, Antarctica, during the 1972 Austral Summer |
topic_facet |
Major oceanography 1973 Dissertation F282 |
description |
During Eltanin Cruise 51 (January-February 1972), hydrographic features, phytoplankton standing crop, and primary production were determined between New Zealand and the Ross Ice Shelf. Four geographical regions with unique physical/chemical characteristics were delineated. They were the Subantarctic (SA), Antarctic Convergence (AC), Antarctic (AA), and Ross Ice Shelf (RIS) regions. Nannoplankton contribution to total phytoplankton standing crop (Chl a) and total primary production (C¹⁴ uptake) was measured by a fractionation process utilizing 10 (subscript "mean" symbol) mesh screens to separate the net and nannoplankton components. Mean phytoplankton standing crop values, integrated to 200 m, for the SA, AC, AA, and RIS regions were 23.62, 35.08, 51.41, and 96.37 mgChl a/m², respectively. Nannoplankton accounted for 76.2%, 88.6%, and 64.9% of the standing crop in these respective areas. A significant correlation was found between the total phytoplankton standing crop in surface samples and standing crop estimates integrated over the water column. However, no correlation was found between size competition of the surface standing crop and that of the euphotic zone. Mean estimates of total phytoplankton production in the euphotic zone for the SA, AA, and RIS regions were 5.72, 6.18, and 9.97 mg/m²/hr. Nannoplankton production remained relatively constant in these regions, accounting for 90.2%, 67.0%, and 54.0% of total production in the respective regions. The increased phytoplankton standing crop and primary production observed in waters south of the Antarctic Convergence were accounted for by increases in the net plankton fraction. Average photosynthetic indexes (PI) were calculated for the total phytoplankton and the nannoplankton fraction. Significant estimates of 0.351 (P=.01) and 0.243 (P=.1) were obtained for the total PI and nannoplankton PI, respectively. |
author2 |
El-Sayed, Sayed Z. |
format |
Thesis |
author |
Fay, Roger Richard |
author_facet |
Fay, Roger Richard |
author_sort |
Fay, Roger Richard |
title |
Significance of nannoplankton in primary production of the Ross Sea, Antarctica, during the 1972 Austral Summer |
title_short |
Significance of nannoplankton in primary production of the Ross Sea, Antarctica, during the 1972 Austral Summer |
title_full |
Significance of nannoplankton in primary production of the Ross Sea, Antarctica, during the 1972 Austral Summer |
title_fullStr |
Significance of nannoplankton in primary production of the Ross Sea, Antarctica, during the 1972 Austral Summer |
title_full_unstemmed |
Significance of nannoplankton in primary production of the Ross Sea, Antarctica, during the 1972 Austral Summer |
title_sort |
significance of nannoplankton in primary production of the ross sea, antarctica, during the 1972 austral summer |
publisher |
Texas A&M University. Libraries |
publishDate |
1973 |
url |
https://hdl.handle.net/1969.1/DISSERTATIONS-187479 |
geographic |
Antarctic The Antarctic Austral Ross Sea Ross Ice Shelf New Zealand |
geographic_facet |
Antarctic The Antarctic Austral Ross Sea Ross Ice Shelf New Zealand |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ross Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ross Ice Shelf Ross Sea |
op_relation |
https://hdl.handle.net/1969.1/DISSERTATIONS-187479 5802152 |
op_rights |
This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. http://rightsstatements.org/vocab/InC/1.0/ |
_version_ |
1771551190949036032 |