CHEMTAX determination of Southern Ocean phytoplankton distribution and adaption: An observational and experimental study assessing the co-limitation of Light, Iron and other Trace Metals on phytoplankton productivity and community composition.
Thesis (MSc)--Stellenbosch University, 2018. ENGLISH ABSTRACT: This multi-manuscript study reports an elucidated understanding of the consequences key environmental changes has on phytoplankton community structure, productivity and their acclimation abilities for the Atlantic Sector of the Southern...
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ftunstellenbosch:oai:scholar.sun.ac.za:10019.1/104834 2023-11-12T04:08:26+01:00 CHEMTAX determination of Southern Ocean phytoplankton distribution and adaption: An observational and experimental study assessing the co-limitation of Light, Iron and other Trace Metals on phytoplankton productivity and community composition. Viljoen, Johannes Jacobus Fietz, Susanne Stellenbosch University. Faculty of Science. Dept. of Earth Sciences. 2018-10-03T09:34:17Z 135 pages : illustrations application/pdf http://hdl.handle.net/10019.1/104834 en_ZA eng Stellenbosch : Stellenbosch University http://hdl.handle.net/10019.1/104834 Stellenbosch University Phytoplankton Pigments Acclimation UCTD Thesis 2018 ftunstellenbosch 2023-10-22T07:26:59Z Thesis (MSc)--Stellenbosch University, 2018. ENGLISH ABSTRACT: This multi-manuscript study reports an elucidated understanding of the consequences key environmental changes has on phytoplankton community structure, productivity and their acclimation abilities for the Atlantic Sector of the Southern Ocean. All three manuscripts are based on data gathered on board the RV SA Agulhas II on a north-south transect along the Good Hope monitoring between Cape Town and the Antarctic Fimbul ice shelf (0° longitude). This transect crossed multiple oceanic fronts and zones from which a multi-parameter in-situ observational study of the links between trace metals and phytoplankton dynamics could be carried out. In addition, two stations were used to conduct bulk-community bottle incubation experiments to assess the response of phytoplankton in growth, photophysiology and community structure to iron and light variability in the Polar Frontal Zone and Antarctic waters. The results from the incubation studies revealed that the response of phytoplankton to changes in iron and light availability are very region-specific. In the Polar Frontal Zone irradiance is limiting significant phytoplankton growth and in the Antarctic Zone, iron addition resulted in growth stimulation even at low light levels. By combining data from the surface and the un-amended incubation bottles sampled from the respective depth of fluorescence maximum an assessment of how representative the surface and chla-max communities are of their region and, considering logistical constraints, if we can only use one to understand phytoplankton dynamics. Due to additional changes in irradiance and availability of iron with vertical depth, which is region specific, the acclimation of phytoplankton, which affects their photochemical efficiency (Fv/Fm) and productivity, can vary with depth which is exemplified by regional differences in water column structure and dynamics. The possibility of sampling a niche community when only one depth is sampled, which could lead ... Thesis Antarc* Antarctic Fimbul Ice Shelf Ice Shelf Southern Ocean Stellenbosch University: SUNScholar Research Repository Antarctic Southern Ocean The Antarctic Fimbul Ice Shelf ENVELOPE(-0.500,-0.500,-70.750,-70.750) |
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Open Polar |
collection |
Stellenbosch University: SUNScholar Research Repository |
op_collection_id |
ftunstellenbosch |
language |
English |
topic |
Phytoplankton Pigments Acclimation UCTD |
spellingShingle |
Phytoplankton Pigments Acclimation UCTD Viljoen, Johannes Jacobus CHEMTAX determination of Southern Ocean phytoplankton distribution and adaption: An observational and experimental study assessing the co-limitation of Light, Iron and other Trace Metals on phytoplankton productivity and community composition. |
topic_facet |
Phytoplankton Pigments Acclimation UCTD |
description |
Thesis (MSc)--Stellenbosch University, 2018. ENGLISH ABSTRACT: This multi-manuscript study reports an elucidated understanding of the consequences key environmental changes has on phytoplankton community structure, productivity and their acclimation abilities for the Atlantic Sector of the Southern Ocean. All three manuscripts are based on data gathered on board the RV SA Agulhas II on a north-south transect along the Good Hope monitoring between Cape Town and the Antarctic Fimbul ice shelf (0° longitude). This transect crossed multiple oceanic fronts and zones from which a multi-parameter in-situ observational study of the links between trace metals and phytoplankton dynamics could be carried out. In addition, two stations were used to conduct bulk-community bottle incubation experiments to assess the response of phytoplankton in growth, photophysiology and community structure to iron and light variability in the Polar Frontal Zone and Antarctic waters. The results from the incubation studies revealed that the response of phytoplankton to changes in iron and light availability are very region-specific. In the Polar Frontal Zone irradiance is limiting significant phytoplankton growth and in the Antarctic Zone, iron addition resulted in growth stimulation even at low light levels. By combining data from the surface and the un-amended incubation bottles sampled from the respective depth of fluorescence maximum an assessment of how representative the surface and chla-max communities are of their region and, considering logistical constraints, if we can only use one to understand phytoplankton dynamics. Due to additional changes in irradiance and availability of iron with vertical depth, which is region specific, the acclimation of phytoplankton, which affects their photochemical efficiency (Fv/Fm) and productivity, can vary with depth which is exemplified by regional differences in water column structure and dynamics. The possibility of sampling a niche community when only one depth is sampled, which could lead ... |
author2 |
Fietz, Susanne Stellenbosch University. Faculty of Science. Dept. of Earth Sciences. |
format |
Thesis |
author |
Viljoen, Johannes Jacobus |
author_facet |
Viljoen, Johannes Jacobus |
author_sort |
Viljoen, Johannes Jacobus |
title |
CHEMTAX determination of Southern Ocean phytoplankton distribution and adaption: An observational and experimental study assessing the co-limitation of Light, Iron and other Trace Metals on phytoplankton productivity and community composition. |
title_short |
CHEMTAX determination of Southern Ocean phytoplankton distribution and adaption: An observational and experimental study assessing the co-limitation of Light, Iron and other Trace Metals on phytoplankton productivity and community composition. |
title_full |
CHEMTAX determination of Southern Ocean phytoplankton distribution and adaption: An observational and experimental study assessing the co-limitation of Light, Iron and other Trace Metals on phytoplankton productivity and community composition. |
title_fullStr |
CHEMTAX determination of Southern Ocean phytoplankton distribution and adaption: An observational and experimental study assessing the co-limitation of Light, Iron and other Trace Metals on phytoplankton productivity and community composition. |
title_full_unstemmed |
CHEMTAX determination of Southern Ocean phytoplankton distribution and adaption: An observational and experimental study assessing the co-limitation of Light, Iron and other Trace Metals on phytoplankton productivity and community composition. |
title_sort |
chemtax determination of southern ocean phytoplankton distribution and adaption: an observational and experimental study assessing the co-limitation of light, iron and other trace metals on phytoplankton productivity and community composition. |
publisher |
Stellenbosch : Stellenbosch University |
publishDate |
2018 |
url |
http://hdl.handle.net/10019.1/104834 |
long_lat |
ENVELOPE(-0.500,-0.500,-70.750,-70.750) |
geographic |
Antarctic Southern Ocean The Antarctic Fimbul Ice Shelf |
geographic_facet |
Antarctic Southern Ocean The Antarctic Fimbul Ice Shelf |
genre |
Antarc* Antarctic Fimbul Ice Shelf Ice Shelf Southern Ocean |
genre_facet |
Antarc* Antarctic Fimbul Ice Shelf Ice Shelf Southern Ocean |
op_relation |
http://hdl.handle.net/10019.1/104834 |
op_rights |
Stellenbosch University |
_version_ |
1782328736112181248 |