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首页> 外文期刊>Harmful Algae >Allelopathic interactions between the HAB dinoflagellate Ostreopsis cf. ovata and macroalgae
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Allelopathic interactions between the HAB dinoflagellate Ostreopsis cf. ovata and macroalgae

机译：HAB dinoflagellate Ostreopsis之间的化感相互作用。卵和大型藻类

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Intense blooms of the toxic benthic dinoflagellate Ostreopsis cf. ovata have been a recurrent phenomenon along several Mediterranean coasts during summer in the last few years. These blooms are often associated with noxious effects on humans and deaths of benthic invertebrates. Previous studies carried out on the Conero Riviera (northern Adriatic Sea) highlighted that Ostreopsis abundances recorded on rocks were significantly higher than on the surface of seaweeds, suggesting that some allelopathic interactions might occur between Ostreopsis and macroalgal substrates. In this study we investigated under experimental conditions the interactions between O. cf. ovata and three of the most common macroalgae in this area: Dictyota dichotoma (brown alga), Rhodymenia pseudopalmata (red alga) and Ulva rigida (green alga). Three different experiments were set up: O. cf. ovata was grown (i) together with fresh macroalgal tissues, (ii) in media in which macroalgae were previously cultured, and (iii) in media with the addition of dry macroalgal powder at different concentrations. The results indicated that all the investigated seaweeds exerted negative effects toward the benthic dinoflagellate O. cf. ovata. D. dichotoma inhibited the growth of O. cf. ovata in all tested experimental conditions; U. rigida had inhibitory effect both in form of fresh thalli and dry powder but not as growth medium filtrate, suggesting that either Ulva does not release any allelopathic compound in the medium in absence of O. cf. ovata or the alleged released allelochemicals are rapidly degradable. Neither the fresh thalli of R. pseudopalmata or the filtrate of its culture medium showed any inhibitory effects, while a negative effect was only observed at high concentrations of dry thallus powder. With the exception of D. dichotoma co-culture experiment, a complete algicidal effect was never observed partly because O. cf. ovata produced a large amount of resting stages, which permitted its survival. (C) 2015 Elsevier B.V. All rights reserved.
机译：有毒的底栖鞭毛鞭毛藻的强烈花开。在过去的几年中，卵子在地中海沿岸地区是一种经常性的现象。这些水华通常与对人类的有害影响以及底栖无脊椎动物的死亡有关。先前在Conero Riviera（北亚得里亚海）上进行的研究强调，岩石上记录的骨增生丰度明显高于海藻表面，这表明骨增生与大藻基质之间可能发生了某些化感作用。在这项研究中，我们研究了实验条件下的相互作用。卵和该区域最常见的三种藻类：Dictyota dichotoma（褐藻），Rhodymenia pseudopalmata（红藻）和Ulva生硬藻（绿藻）。建立了三个不同的实验：O．卵子（i）与新鲜的大型藻类组织一起生长，（ii）在先前已培养大型藻类的培养基中，和（iii）在培养基中加入不同浓度的干燥大型藻类粉末。结果表明，所有调查的海藻均对底栖的鞭毛藻有负面影响。卵形D. dichotoma抑制了O. cf.的生长。在所有测试过的实验条件下的卵子；刚性链球菌以新鲜的沙利和干粉的形式均具有抑制作用，但不作为生长培养基的滤液具有抑制作用，这表明Ulva在不存在O.cf.的情况下均不会在培养基中释放任何化感化合物。卵形蛋白或所谓的释放的化感物质可快速降解。假palmata的新鲜thalli或其培养基的滤液均未显示任何抑制作用，而仅在高浓度的thallus干粉中才观察到负面作用。除双歧杆菌共培养实验外，从未观察到完整的杀藻作用，部分原因是因为卵子产生了大量的休息期，使其得以存活。 （C）2015 Elsevier B.V.保留所有权利。

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