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首页> 外文期刊>Estuarine Coastal and Shelf Science >Toxic effects of decomposing red algae on littoral organisms
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Toxic effects of decomposing red algae on littoral organisms

机译：分解红藻对沿海生物的毒性作用

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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 Anemia 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 I. 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.
机译：经常在波罗的海中部的海滩上冲刷掉大量的波西菲亚属，罗多梅拉属和天竺葵属的丝状红藻。随着藻类物质开始腐烂，红色的污水渗入水中，这种色泽可能在离岸几百米处被发现。在这项研究中，测试了这些废水对不同营养水平的滨海生物可能产生的毒性作用。考察了对褐藻海藻（Fusus vesiculosus）的受精，发芽和幼体存活的影响，并对甲壳类贫血盐虾和波多黎各（Idotea baltica）以及鱼Pomatoschistus microps的幼虫和成虫进行了死亡率测试。葡萄球菌是被测生物对红藻提取物最敏感的物种。当暴露于相当于1.7 g l〜（-1）dw红藻的浓度时，F。vesiculosus新兵的存活率降低了50％（LC50）。波罗的海I. salina和P. microps的致死浓度大约高十倍。如果藻类提取物在两周内分解，则对盐沼的毒性降低，但是毒性的下降不受不同光照或温度条件的影响。这项研究表明，波罗的海中部的丝状红藻可能产生和释放对沿海生态系统有负面影响的化合物。对于关键物种维氏梭菌（F. vesiculosus）的影响可能特别严重，该物种在秋季繁殖，此时丝状红色藻华最为严重。

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