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Influence of Acartia cf. bifilosa (Copepoda) on morphology and toxicity of Nodularia spumigena (Cyanophyceae)
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences. (Plankton Ecology)
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences. (Plankton Ecology)
Berlin Institute of Technology (BIT), Germany. (Department Ecological Impact Research and Ecotoxicology)
2012 (English)In: Harmful Algae, ISSN 1568-9883, E-ISSN 1878-1470, Vol. 18, 35-46 p.Article in journal (Refereed) Published
Abstract [en]

Nodularia spumigena was exposed directly and indirectly (grazer cages) to increasing densities of Acartiacf. bifilosa to investigate if the presence of copepods influenced the morphology and/or the toxicity of thecyanobacterium. Monocultures with only N. spumigena and mixed cultures, containing N. spumigena andthe non-toxic Dunaliella tertiolecta, were included in each experiment. Following 6 days of incubation,the morphology and toxicity in grazer treatments were compared with grazer-free controls. Weobserved no effects of A. cf. bifilosa on either morphology or toxicity of N. spumigena. The lack of grazerinduced nodularin production and morphological alterations suggest that these two potential defensestrategies either has evolved as constitutive defenses or never evolved as grazer defenses. The mortalityof copepods was higher in the monoculture than in the mixed culture treatments. Gut contentobservations indicated a low level of grazing in monoculture treatments and a higher level of grazing inmixed culture treatments. This higher level of grazing most likely occurred on the alternative food D.tertiolecta. Given the indications of low grazing and the concentrations of dissolved nodularin observed,we postulate that the higher mortality was not related to toxic effects, but to starvation. This in turn mayhave resulted from bad taste, production of unknown grazer deterrents or morphological constraints;although the size of the filaments would not have imposed an absolute limit for ingestion by A. cf. bifilosa.The higher copepod mortality observed on monocultures of N. spumigena may contribute to the successand maintenance of N. spumigena blooms.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 18, 35-46 p.
Keyword [en]
Nodularia spumigena, Nodularin, Morphology, A. cf. bifilosa, Infochemicals
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-21337DOI: 10.1016/j.hal.2012.04.003OAI: oai:DiVA.org:lnu-21337DiVA: diva2:548040
Available from: 2012-08-29 Created: 2012-08-29 Last updated: 2016-12-20Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S1568988312000777

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CiteExportLink to record
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