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Deposit-feeders accumulate the cyanobacterial toxin nodularin
Stockholm University, Faculty of Science, Department of Systems Ecology.
2011 (English)In: Harmful Algae, ISSN 1568-9883, E-ISSN 1878-1470, Vol. 12, 77-81 p.Article in journal (Refereed) Published
Abstract [en]

Blooms of toxic cyanobacteria may potentially affect food web productivity and even be a human health hazard. In the Baltic Sea, regularly occurring summer blooms of nitrogen-fixing cyanobacteria are often dominated by Nodularia spumigena, which produces the potent hepatotoxin nodularin. Evidence of sedimentation of these blooms indicates that benthic fauna can be exposed to nodularin. In a one month experiment, we simulated the settling of a summer bloom dominated by N. spumigena in sediment microcosms with three species of sediment-dwelling, deposit-feeding macrofauna, the amphipods Monoporeia affinis and Pontoporeia femorata and the bivalve Macoma balthica, and analyzed nodularin in the animals by HPLC-ESI-MS (high-performance liquid chromatography-electrospray ionization-mass spectrometry). We found nodularin in quantities of 50-120 ng g(-1) DW. The results show that deposit-feeding macrofauna in the Baltic Sea may contribute to trophic transfer of nodularin.

Place, publisher, year, edition, pages
2011. Vol. 12, 77-81 p.
Keyword [en]
Benthic-pelagic coupling, Bioaccumulation, Ecosystem effects, Food web, Incorporation
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:su:diva-74041DOI: 10.1016/j.hal.2011.09.003ISI: 000299146400008OAI: oai:DiVA.org:su-74041DiVA: diva2:506703
Note

authorCount :2

Available from: 2012-02-29 Created: 2012-02-28 Last updated: 2017-10-04Bibliographically approved
In thesis
1. Benthic use of phytoplankton blooms: uptake, burial and biodiversity effects in a species-poor system
Open this publication in new window or tab >>Benthic use of phytoplankton blooms: uptake, burial and biodiversity effects in a species-poor system
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Animals living in marine sediments (the second largest habitat on earth) play a major role in global biogeochemical cycling. By feeding on organic matter from settled phytoplankton blooms they produce food for higher trophic levels and nutrients that can fuel primary production. In the Baltic Sea, anthropogenic stresses, such as eutrophication and introductions of invasive species, have altered phytoplankton dynamics and benthic communities. This thesis discusses the effects of different types of phytoplankton on the deposit-feeding community and the importance of benthic biodiversity for fate of the phytoplankton bloom-derived organic matter.

Deposit-feeders survived and fed on settled cyanobacterial bloom material and in doing so accumulated the cyanobacterial toxin nodularin. Their growth after feeding on cyanobacteria was much slower than on a diet of spring bloom diatoms. The results show that settling blooms of cyanobacteria are used as food without obvious toxic effects, although they do not sustain rapid growth of the fauna. Since all tested species accumulated the cyanotoxin, negative effects higher up in the food web can not be ruled out. Both species composition and richness of deposit-feeding macrofauna influenced how much of the phytoplankton bloom material that was incorporated in fauna or retained in the sediment. The mechanism behind the positive effect of species richness was mainly niche differentiation among functionally different species, resulting in a more efficient utilization of resources at greater biodiversity. This was observed even after addition of an invasive polychaete species. Hence, species loss can be expected to affect benthic productivity negatively. In conclusion, efficiency in organic matter processing depends both on pelagic phytoplankton quality and benthic community composition and species richness.

Place, publisher, year, edition, pages
Stockholm: Department of Systems Ecology, Stockholm University, 2010. 39 p.
Keyword
biodiversity, ecosystem functioning, benthic-pelagic coupling, niche, resource partitioning, competition, eutrophication, cyanobacterial blooms, diatoms, invasive species, Baltic Sea
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-32598 (URN)978-91-7155-991-3 (ISBN)
Public defence
2010-02-05, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 09:30 (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 4: In press. Paper 5: Manuscript.

Available from: 2009-12-21 Created: 2009-12-14 Last updated: 2017-10-04Bibliographically approved

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