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Incorporation and burial of carbon from settling cyanobacterial blooms by deposit-feeding macrofauna
Stockholm University, Faculty of Science, Department of Systems Ecology. (Marin Ekologi)
Stockholm University, Faculty of Science, Department of Systems Ecology.
Stockholm University, Faculty of Science, Department of Systems Ecology.
2008 (English)In: Limnology and Oceanography, ISSN 0024-3590, Vol. 53, no 6, 2754-2758 p.Article in journal (Refereed) Published
Abstract [en]

Summer blooms of filamentous, nitrogen-fixing cyanobacteria are typical of the Baltic Sea, and recent findings indicate that cyanobacteria may be an important food source for the benthos below the euphotic zone. In a 2-week laboratory experiment, we measured incorporation of cyanobacterial carbon by the deposit-feeding amphipod Monoporeia affinis when exposed to 14C-radiolabeled, natural blooms of cyanobacteria dominated by either the toxic Nodularia spumigena or non-toxic Aphanizomenon sp. Carbon from both cyanobacterial blooms was used, with greater incorporation from Aphanizomenon-dominated bloom material than from N. spumigena, indicating that the latter is less suitable as food. However, neither cyanobacterium supported significant amphipod growth. Also, less cyanobacterial carbon was mixed down in the sediment in the N. spumigena treatment, indicating lower bioturbation activity in this treatment. Long-term effects on feeding and survival remain to be studied, especially for the toxic N. spumigena.

Place, publisher, year, edition, pages
American Society of Limnology and Oceanography, Inc. , 2008. Vol. 53, no 6, 2754-2758 p.
URN: urn:nbn:se:su:diva-32572ISI: 000261355500037OAI: diva2:281009
Available from: 2009-12-14 Created: 2009-12-14 Last updated: 2009-12-21Bibliographically 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.
biodiversity, ecosystem functioning, benthic-pelagic coupling, niche, resource partitioning, competition, eutrophication, cyanobacterial blooms, diatoms, invasive species, Baltic Sea
National Category
Research subject
Marine Ecology
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)
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: 2011-02-11Bibliographically approved

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Karlson, AgnesNascimento, FranciscoElmgren, Ragnar
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