Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Determining light suppression of mitochondrial respiration for three temperate marine macrophytes using the Kok method
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
2014 (English)In: Botanica Marina, ISSN 0006-8055, E-ISSN 1437-4323, Vol. 57, no 6, 483-486 p.Article in journal (Refereed) Published
Abstract [en]

To properly calculate the carbon budgets of coastal marine habitats, potential fluctuations in oxygen consumption due to mitochondrial respiration must be taken into account. As mitochondrial respiration is sometimes inhibited in light, we used the Kok method to estimate whether such suppression occurs in the seagrasses Zostera marina and Ruppia maritima as well as in the macroalga Ulva intestinalis. For Z. marina and U. intestinalis, the respiration rate was clearly downregulated in light, a finding that might be important when determining the impact of respiration on estimated net primary productivity in these marine habitats.

Place, publisher, year, edition, pages
2014. Vol. 57, no 6, 483-486 p.
Keyword [en]
coastal primary production, Kok effect, mitochondrial respiration in light
National Category
Biological Sciences
Research subject
Plant Physiology
Identifiers
URN: urn:nbn:se:su:diva-111404DOI: 10.1515/bot-2014-0046ISI: 000345632100008OAI: oai:DiVA.org:su-111404DiVA: diva2:775789
Note

AuthorCount:2;

Available from: 2015-01-05 Created: 2015-01-02 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Seagrass Respiration: An assessment of oxygen consumption patterns of temperate marine macrophytes
Open this publication in new window or tab >>Seagrass Respiration: An assessment of oxygen consumption patterns of temperate marine macrophytes
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In coastal seas, the abundance of marine macrophytes has profound influence on the flows of oxygen and inorganic carbon through the water. Vast amounts of carbon dioxide are taken up by photosynthesis and part of this is respired back into the water column. The photosynthetic carbon uptake of the most common seagrasses of the northern hemisphere is nowadays extensively studied at both community- and individual levels, and its impact on coastal carbon- and oxygen fluxes is quite well defined. However, the coinciding release of carbon dioxide and consumption of oxygen by the processes of mitochondrial respiration and photorespiration in these organisms has as yet not been given much attention, especially concerning how these processes are affected by external factors. For estimations of the rates of mitochondrial respiration, the common approach has been to use values obtained during darkness and treat them as being constant over the day. This approach is questioned in this thesis where the effects of different abiotic and biotic factors on oxygen consumption were examined to elucidate possible variations of seagrass respiration rates (with primary focus on the species Zostera marina), explored mainly using gas exchange techniques. The initial aim was to investigate whether the rates of respiration are at all fluctuating. This was found to be the case. Secondly, impacts of various factors on the respiration process were examined on Z. marina, with additional studies on the seagrass Ruppia maritima and the common green alga Ulva intestinalis. It was found that respiration rates were lower in the light for all three species. Specific investigations on Z. marina showed that respiration rates also varied with time of the day. Moreover, the rates of both respiration and photosynthesis differed between Z. marina shoots of different age as well as among different parts of the leaves. These differences were observed at both ambient (19.1oC) and elevated (29.1oC) temperatures. Photorespiration, previously considered insignificant in seagrasses, was found to have a profound role, as high rates were observed in productive bays, i.e. in settings with low inorganic carbon availability and high oxygen. Overall, this thesis has identified important external and developmental factors influencing the patterns of oxygen consumption and associated carbon dioxide release of two common temperate seagrasses. Clearly, respiration in seagrasses is a dynamic process that responds to a variety of external and developmental factors, which should be carefully considered when assessing the carbon budget of coastal vegetated areas.

Place, publisher, year, edition, pages
Stockholm: Department of Ecology, Environment and Plant Sciences, Stockholm University, 2015. 54 p.
Keyword
Mitochondrial respiration, Photorespiration, Seagrass productivity, Zostera marina, Marine carbon budgets, Ruppia maritima, Ulva intestinalis
National Category
Other Biological Topics
Research subject
Plant Physiology
Identifiers
urn:nbn:se:su:diva-120156 (URN)978-91-7649-230-7 (ISBN)
Public defence
2015-10-09, William-Olssonsalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript.

Available from: 2015-09-17 Created: 2015-09-02 Last updated: 2015-09-16Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Rasmusson, Lina M.Björk, Mats
By organisation
Department of Ecology, Environment and Plant Sciences
In the same journal
Botanica Marina
Biological Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 67 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf