The effect of climate change on the carbon balance between photosynthesis and respiration in Antarctic microalgae
The biological process of the carbon cycle in the Antarctic Ocean is controlled by the photosynthetic activity of the primary producers. The amount of fixed carbon does not only depend on the photosynthetic activity but also on the carbon losses due to respiration. Thus, the ratio photosynthesis to...
Main Author: | |
---|---|
Other Authors: | |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://nbn-resolving.org/urn:nbn:de:bsz:15-qucosa2-367487 https://ul.qucosa.de/id/qucosa%3A36748 https://ul.qucosa.de/api/qucosa%3A36748/attachment/ATT-0/ |
id |
ftunivleipzig:oai:qucosa:de:qucosa:36748 |
---|---|
record_format |
openpolar |
spelling |
ftunivleipzig:oai:qucosa:de:qucosa:36748 2023-09-05T13:14:06+02:00 The effect of climate change on the carbon balance between photosynthesis and respiration in Antarctic microalgae Bozzato, Deborah Universität Leipzig 2019-10-01 https://nbn-resolving.org/urn:nbn:de:bsz:15-qucosa2-367487 https://ul.qucosa.de/id/qucosa%3A36748 https://ul.qucosa.de/api/qucosa%3A36748/attachment/ATT-0/ eng eng urn:nbn:de:bsz:15-qucosa2-367487 https://ul.qucosa.de/id/qucosa%3A36748 https://ul.qucosa.de/api/qucosa%3A36748/attachment/ATT-0/ info:eu-repo/semantics/openAccess Antarctic Ocean Phytoplankton Primary productivity Respiration Iron limitation info:eu-repo/classification/ddc/570 ddc:570 info:eu-repo/semantics/updatedVersion doc-type:doctoralThesis info:eu-repo/semantics/doctoralThesis doc-type:Text 2019 ftunivleipzig 2023-08-11T13:58:42Z The biological process of the carbon cycle in the Antarctic Ocean is controlled by the photosynthetic activity of the primary producers. The amount of fixed carbon does not only depend on the photosynthetic activity but also on the carbon losses due to respiration. Thus, the ratio photosynthesis to respiration (rP/R) is an important parameter to predict the effect of climate change on the Antarctic ecosystem. Indeed, the ongoing changes in climate change are influencing the dynamics of environmental conditions, which has tremendous effects on the phytoplankton community. Therefore, two ecologically relevant species from the Southern Ocean were here investigated: the diatom Chaetoceros sp. and the prymnesiophyte Phaeocystis antarctica, studying the changes in the rP/R under global climate change conditions. Three main parameters were examined i.e temperature, salinity and iron limitation. The P/R ratio was significantly affected by temperature, while salinity had only a secondary importance, although with species-specific differences. More specifically, the values were ranging from 12.3 to 7.5 for Chaetoceros sp. and from 12.4 to 2.5 for P. antarctica. The changes in this ratio were principally due to variations in respiration, rather than in photosynthesis. Chaetoceros sp. appears to be less flexible in the regulation of the extent of photoprotective mechanisms (non-photochemical quenching and alternative electrons), but its photoprotective level was generally higher than in P. antarctica. Regarding iron limitation, data were successfully collected only for Chaetoceros sp. The P/R ratio, equal to 2.8, did not change under iron limitation, with iron limited cells showing a very efficient acclimation to the lowered assimilatory metabolism by decreasing their respiratory losses. Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctic Ocean Antarctica Southern Ocean Universität Leipzig: Qucosa Antarctic Antarctic Ocean Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Universität Leipzig: Qucosa |
op_collection_id |
ftunivleipzig |
language |
English |
topic |
Antarctic Ocean Phytoplankton Primary productivity Respiration Iron limitation info:eu-repo/classification/ddc/570 ddc:570 |
spellingShingle |
Antarctic Ocean Phytoplankton Primary productivity Respiration Iron limitation info:eu-repo/classification/ddc/570 ddc:570 Bozzato, Deborah The effect of climate change on the carbon balance between photosynthesis and respiration in Antarctic microalgae |
topic_facet |
Antarctic Ocean Phytoplankton Primary productivity Respiration Iron limitation info:eu-repo/classification/ddc/570 ddc:570 |
description |
The biological process of the carbon cycle in the Antarctic Ocean is controlled by the photosynthetic activity of the primary producers. The amount of fixed carbon does not only depend on the photosynthetic activity but also on the carbon losses due to respiration. Thus, the ratio photosynthesis to respiration (rP/R) is an important parameter to predict the effect of climate change on the Antarctic ecosystem. Indeed, the ongoing changes in climate change are influencing the dynamics of environmental conditions, which has tremendous effects on the phytoplankton community. Therefore, two ecologically relevant species from the Southern Ocean were here investigated: the diatom Chaetoceros sp. and the prymnesiophyte Phaeocystis antarctica, studying the changes in the rP/R under global climate change conditions. Three main parameters were examined i.e temperature, salinity and iron limitation. The P/R ratio was significantly affected by temperature, while salinity had only a secondary importance, although with species-specific differences. More specifically, the values were ranging from 12.3 to 7.5 for Chaetoceros sp. and from 12.4 to 2.5 for P. antarctica. The changes in this ratio were principally due to variations in respiration, rather than in photosynthesis. Chaetoceros sp. appears to be less flexible in the regulation of the extent of photoprotective mechanisms (non-photochemical quenching and alternative electrons), but its photoprotective level was generally higher than in P. antarctica. Regarding iron limitation, data were successfully collected only for Chaetoceros sp. The P/R ratio, equal to 2.8, did not change under iron limitation, with iron limited cells showing a very efficient acclimation to the lowered assimilatory metabolism by decreasing their respiratory losses. |
author2 |
Universität Leipzig |
format |
Doctoral or Postdoctoral Thesis |
author |
Bozzato, Deborah |
author_facet |
Bozzato, Deborah |
author_sort |
Bozzato, Deborah |
title |
The effect of climate change on the carbon balance between photosynthesis and respiration in Antarctic microalgae |
title_short |
The effect of climate change on the carbon balance between photosynthesis and respiration in Antarctic microalgae |
title_full |
The effect of climate change on the carbon balance between photosynthesis and respiration in Antarctic microalgae |
title_fullStr |
The effect of climate change on the carbon balance between photosynthesis and respiration in Antarctic microalgae |
title_full_unstemmed |
The effect of climate change on the carbon balance between photosynthesis and respiration in Antarctic microalgae |
title_sort |
effect of climate change on the carbon balance between photosynthesis and respiration in antarctic microalgae |
publishDate |
2019 |
url |
https://nbn-resolving.org/urn:nbn:de:bsz:15-qucosa2-367487 https://ul.qucosa.de/id/qucosa%3A36748 https://ul.qucosa.de/api/qucosa%3A36748/attachment/ATT-0/ |
geographic |
Antarctic Antarctic Ocean Southern Ocean The Antarctic |
geographic_facet |
Antarctic Antarctic Ocean Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctic Ocean Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Ocean Antarctica Southern Ocean |
op_relation |
urn:nbn:de:bsz:15-qucosa2-367487 https://ul.qucosa.de/id/qucosa%3A36748 https://ul.qucosa.de/api/qucosa%3A36748/attachment/ATT-0/ |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1776205159463911424 |