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Projected marine climate changes: effects on copepod oxidative status and reproduction
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Because of their important role between primary producers and fish, it is crucial to address zooplankton responses when predicting effects of climate change on pelagic ecosystems. For realistic community-level predictions, several biotic and abiotic climate-related variables should be examined in combination. We studied the combined effects of ocean acidification and global warming predicted for year 2100 with toxic cyanobacteria on a calanoid copepod, Acartia bifilosa. Together, acidification and temperature increase reduced copepod antioxidant capacity. Egg viability, nauplii development and oxidative status also decreased at above-ambient temperature. Exposure to cyanobacteria and its toxin had a negative effect on egg production but, surprisingly, a positive effect on oxidative status and egg viability. This resulted in no net effects on viable egg production. Additionally, nauplii development was enhanced by presence of cyanobacteria, which partially alleviated the otherwise negative effects of forecasted climate change on the copepod population.

National Category
Ecology
Research subject
Marine Ecology
Identifiers
URN: urn:nbn:se:su:diva-81677OAI: oai:DiVA.org:su-81677DiVA: diva2:563476
Available from: 2012-10-30 Created: 2012-10-30 Last updated: 2012-10-31Bibliographically approved
In thesis
1. Summer cyanobacterial blooms in the Baltic Sea - implications for copepod recruitment
Open this publication in new window or tab >>Summer cyanobacterial blooms in the Baltic Sea - implications for copepod recruitment
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

During summer, the Baltic Sea is subjected to the world’s largest cyanobacterial blooms. These blooms are linked to eutrophication and raise many questions concerning their effects on the ecosystem. To understand their impacts on the food web dynamics, it is essential to assess growth responses of grazers to these cyanobacteria. In the northern Baltic proper, copepods are the most important herbivores providing an essential link between the primary producers and higher trophic levels. In this Thesis, Papers I & II evaluate methods to estimate copepod growth in response to feeding conditions in situ. The most conspicuous diazotrophic filamentous cyanobacterium in the Baltic Sea is Nodularia spumigena, a producer of nodularin which is highly toxic to vertebrates, yet its ecological role is largely unknown. In Paper III, reciprocal interactions between cyanobacteria, sympatric algae and copepods are studied. The results suggest that nodularin is likely involved in allelopathic interactions, but it is not an inducible defense against grazers. Furthermore, the results of Papers IV & V, indicate that natural assemblages of N. spumigena and Anabaena spp. may support copepod reproduction and that total diazotrophic filamentous cyanobacteria appear to provide a beneficial feeding environment for the feeding stages of copepod nauplii, most probably by stimulating the microbial communities that nauplii feed upon. Since cyanobacterial blooms are projected to increase due to global climate change, the combined effects of toxic cyanobacteria, ocean acidification and global warming predicted for year 2100 are further investigated on copepods in Paper IV. Taken together, these studies indicate that filamentous diazotrophic cyanobacteria contribute to sustaining secondary productivity and have potential implications of management practices with respect to combating eutrophication, global climate change and sustaining fish feeding conditions.

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University, 2012. 56 p.
Keyword
Cyanobacteria, Calanoid copepods, Food web interactions, Harmful algae blooms, Zooplankton, Nodularin, Allelopathy, Baltic Sea, Biochemical markers, RNA-based indices, Acidification, Global Climate Change
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-81680 (URN)978-91-7447-566-1 (ISBN)
Public defence
2012-12-03, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 10:00 (English)
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Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 4: Manuscript. Paper 5: Manuscript.

Available from: 2012-11-12 Created: 2012-10-30 Last updated: 2015-04-13Bibliographically approved

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