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Toxic effects of decomposing red algae on littoral organisms
2005 (English)In: Estuarine, Coastal and Shelf Science, ISSN 0272-7714, E-ISSN 1096-0015, Vol. 62, no 4, 621-626 p.Article in journal (Refereed) Published
Abstract [en]

Large masses of filamentous red algae of the genera Polysiphonia, Rhodomela, and Ceramium are regularly washed up on beaches of the central Baltic Sea. As the algal masses start to decay, red coloured effluents leak into the water, and this tinge may be traced several hundred meters off shore. In this study, possible toxic effects of these effluents were tested on littoral organisms from different trophic levels. Effects on fertilisation, germination and juvenile survival of the brown seaweed Fucus vesiculosus were investigated, and mortality tests were performed on the crustaceans Artemia salina and Idotea baltica, as well as on larvae and adults of the fish Pomatoschistus microps. Fucus vesiculosus was the most sensitive species of the tested organisms to the red algal extract. The survival of F. vesiculosus recruits was reduced with 50% (LC50) when exposed to a concentration corresponding to 1.7 g l(-1) dw red algae. The lethal concentration for L baltica, A. salina and P. microps were approximately ten times higher. The toxicity to A. salina was reduced if the algal extract was left to decompose during two weeks but the decline in toxicity was not affected by different light or temperature conditions. This study indicates that the filamentous red algae in the central Baltic Sea may produce and release compounds with negative effects on the littoral ecosystem. The effects may be particularly serious for the key species F. vesiculosus, which reproduce in autumn when filamentous red algal blooms are most severe. (C) 2004 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2005. Vol. 62, no 4, 621-626 p.
National Category
Zoology Ecology Other Biological Topics
Identifiers
URN: urn:nbn:se:lnu:diva-18766OAI: oai:DiVA.org:lnu-18766DiVA: diva2:527862
Available from: 2012-05-22 Created: 2012-05-22 Last updated: 2016-05-03Bibliographically approved

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Svensson, A. P.
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Citation style
  • apa
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  • vancouver
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  • nn-NB
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