Toxic effects of decomposing red algae on littoral organisms

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Eklund, B. (author)

Toxic effects of decomposing red algae on littoral organisms

Article/chapterEnglish2005

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2005
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LIBRIS-ID:oai:DiVA.org:lnu-18766
https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-18766URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

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.

Subject headings and genre

NATURVETENSKAP Biologi Zoologi hsv//swe
NATURAL SCIENCES Biological Sciences Zoology hsv//eng
NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
NATURVETENSKAP Biologi Annan biologi hsv//swe
NATURAL SCIENCES Biological Sciences Other Biological Topics hsv//eng

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Svensson, A. P. (author)
Jonsson, C. (author)
Malm, T. (author)

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In:Estuarine, Coastal and Shelf Science62:4, s. 621-6260272-77141096-0015

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By the author/editor: Eklund, B.; Svensson, A. P.; Jonsson, C.; Malm, T.

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Zoology

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Other Biological ...

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By the university: Linnaeus University

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