Negligible effects of ocean acidification on <i>Eurytemora affinis</i> (Copepoda) offspring production
Ocean acidification is caused by increasing amounts of carbon dioxide dissolving in the oceans leading to lower seawater pH. We studied the effects of lowered pH on the calanoid copepod <i>Eurytemora affinis</i> during a mesocosm experiment conducted in a coastal area of the Baltic Sea....
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-02-01
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| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/13/1037/2016/bg-13-1037-2016.pdf |
| _version_ | 1818958547168264192 |
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| author | A.-K. Almén A. Vehmaa A. Brutemark L. Bach S. Lischka A. Stuhr S. Furuhagen A. Paul J. R. Bermúdez U. Riebesell J. Engström-Öst |
| author_facet | A.-K. Almén A. Vehmaa A. Brutemark L. Bach S. Lischka A. Stuhr S. Furuhagen A. Paul J. R. Bermúdez U. Riebesell J. Engström-Öst |
| author_sort | A.-K. Almén |
| collection | DOAJ |
| description | Ocean acidification is caused by increasing amounts of carbon dioxide
dissolving in the oceans leading to lower seawater pH. We studied the
effects of lowered pH on the calanoid copepod <i>Eurytemora affinis</i> during a mesocosm experiment
conducted in a coastal area of the Baltic Sea. We measured copepod
reproductive success as a function of pH, chlorophyll <i>a</i> concentration, diatom
and dinoflagellate biomass, carbon to nitrogen (C : N) ratio of suspended
particulate organic matter, as well as copepod fatty acid composition. The
laboratory-based experiment was repeated four times during 4 consecutive
weeks, with water and copepods sampled from pelagic mesocosms enriched with
different CO<sub>2</sub> concentrations. In addition, oxygen radical
absorbance capacity (ORAC) of animals from the mesocosms was measured weekly
to test whether the copepod's defence against oxidative
stress was affected by pH. We found no effect of pH on offspring production.
Phytoplankton biomass, as indicated by chlorophyll <i>a</i> concentration and
dinoflagellate biomass, had a positive effect. The concentration of
polyunsaturated fatty acids in the females was reflected in the eggs and
had a positive effect on offspring production, whereas monounsaturated fatty
acids of the females were reflected in their eggs but had no significant
effect. ORAC was not affected by pH. From these experiments we conclude that
<i>E. affinis</i> seems robust against direct exposure to ocean acidification on a
physiological level, for the variables covered in the study. <i>E. affinis</i> may not have
faced acute pH stress in the treatments as the species naturally face large
pH fluctuations. |
| first_indexed | 2024-12-20T11:27:29Z |
| format | Article |
| id | doaj.art-6570ea1236f9489195b364ee49ba86bd |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-12-20T11:27:29Z |
| publishDate | 2016-02-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-6570ea1236f9489195b364ee49ba86bd2022-12-21T19:42:20ZengCopernicus PublicationsBiogeosciences1726-41701726-41892016-02-011341037104810.5194/bg-13-1037-2016Negligible effects of ocean acidification on <i>Eurytemora affinis</i> (Copepoda) offspring productionA.-K. Almén0A. Vehmaa1A. Brutemark2L. Bach3S. Lischka4A. Stuhr5S. Furuhagen6A. Paul7J. R. Bermúdez8U. Riebesell9J. Engström-Öst10Environmental and Marine Biology, Faculty of Science and Engineering, Åbo Akademi University, Artillerigatan 6, 20500 Åbo, FinlandTvärminne Zoological Station, University of Helsinki, J.A. Palménin tie 260, 10900 Hanko, FinlandNovia University of Applied Sciences Coastal Zone Research Team, Raseborgsvägen 9, 10600, Ekenäs FinlandGEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, GermanyGEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, GermanyGEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, GermanyDepartment of Environmental Science and Analytical Chemistry, Stockholm University, Svante Arrhenius väg 8, 11418 Stockholm, SwedenGEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, GermanyGEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, GermanyGEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, GermanyEnvironmental and Marine Biology, Faculty of Science and Engineering, Åbo Akademi University, Artillerigatan 6, 20500 Åbo, FinlandOcean acidification is caused by increasing amounts of carbon dioxide dissolving in the oceans leading to lower seawater pH. We studied the effects of lowered pH on the calanoid copepod <i>Eurytemora affinis</i> during a mesocosm experiment conducted in a coastal area of the Baltic Sea. We measured copepod reproductive success as a function of pH, chlorophyll <i>a</i> concentration, diatom and dinoflagellate biomass, carbon to nitrogen (C : N) ratio of suspended particulate organic matter, as well as copepod fatty acid composition. The laboratory-based experiment was repeated four times during 4 consecutive weeks, with water and copepods sampled from pelagic mesocosms enriched with different CO<sub>2</sub> concentrations. In addition, oxygen radical absorbance capacity (ORAC) of animals from the mesocosms was measured weekly to test whether the copepod's defence against oxidative stress was affected by pH. We found no effect of pH on offspring production. Phytoplankton biomass, as indicated by chlorophyll <i>a</i> concentration and dinoflagellate biomass, had a positive effect. The concentration of polyunsaturated fatty acids in the females was reflected in the eggs and had a positive effect on offspring production, whereas monounsaturated fatty acids of the females were reflected in their eggs but had no significant effect. ORAC was not affected by pH. From these experiments we conclude that <i>E. affinis</i> seems robust against direct exposure to ocean acidification on a physiological level, for the variables covered in the study. <i>E. affinis</i> may not have faced acute pH stress in the treatments as the species naturally face large pH fluctuations.http://www.biogeosciences.net/13/1037/2016/bg-13-1037-2016.pdf |
| spellingShingle | A.-K. Almén A. Vehmaa A. Brutemark L. Bach S. Lischka A. Stuhr S. Furuhagen A. Paul J. R. Bermúdez U. Riebesell J. Engström-Öst Negligible effects of ocean acidification on <i>Eurytemora affinis</i> (Copepoda) offspring production Biogeosciences |
| title | Negligible effects of ocean acidification on <i>Eurytemora affinis</i> (Copepoda) offspring production |
| title_full | Negligible effects of ocean acidification on <i>Eurytemora affinis</i> (Copepoda) offspring production |
| title_fullStr | Negligible effects of ocean acidification on <i>Eurytemora affinis</i> (Copepoda) offspring production |
| title_full_unstemmed | Negligible effects of ocean acidification on <i>Eurytemora affinis</i> (Copepoda) offspring production |
| title_short | Negligible effects of ocean acidification on <i>Eurytemora affinis</i> (Copepoda) offspring production |
| title_sort | negligible effects of ocean acidification on i eurytemora affinis i copepoda offspring production |
| url | http://www.biogeosciences.net/13/1037/2016/bg-13-1037-2016.pdf |
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