Diatoms of the genus are widespread in marine waters. Some of them can produce the toxin domoic acid (DA) which can be responsible for amnesic shellfish poisoning (ASP) when transferred into the food web. These ASP events are of major concern, due to their ecological and socio-economic repercussions, particularly on the shellfish industry. Many studies have focused on the influence of abiotic factors on DA induction, less on the role of biotic interactions. Recently, the presence of predators has been shown to increase DA production in several species, in particular in Arctic areas. In order to investigate the relationship between species and grazers from the French coast, exposures between one strain of three species and the copepod were conducted for 5 days. Cellular and dissolved DA content were enhanced by 1,203 % and 1,556 % respectively after the 5-days exposure of whereas no DA induction was observed in and consumed all three species. The copepod survival was not related to DA content. This study is an essential first step to better understanding the interactions between planktonic species from the French coast and highlights the potential key role of copepods in the - bloom events in the temperate ecosystems.

中文翻译：

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法国海岸桡足类 Temora longicornis 诱导澳大利亚拟菱形藻产生软骨藻酸的第一个证据


该属硅藻广泛存在于海水中。其中一些会产生毒素软骨藻酸（DA），当转移到食物网中时，这种毒素会导致遗忘性贝类中毒（ASP）。这些 ASP 事件因其生态和社会经济影响而备受关注，特别是对贝类产业。许多研究关注非生物因素对 DA 诱导的影响，较少关注生物相互作用的作用。最近，捕食者的存在已被证明可以增加一些物种的 DA 产量，特别是在北极地区。为了调查法国海岸物种与食草动物之间的关系，对三种物种的一种品系与桡足类动物进行了为期 5 天的暴露。暴露 5 天后，细胞和溶解的 DA 含量分别增加了 1,203% 和 1,556%，而在所有三个物种中均未观察到并消耗了 DA 诱导。桡足类存活率与DA含量无关。这项研究是更好地了解法国海岸浮游物种之间相互作用的重要第一步，并强调了桡足类在温带生态系统水华事件中的潜在关键作用。