Marine Scotland Science, Marine Laboratory, 375 Victoria Road, Aberdeen, AB11 9DB, UK.
Marine Scotland Science, Marine Laboratory, 375 Victoria Road, Aberdeen, AB11 9DB, UK.
Harmful Algae. 2017 Mar;63:193-202. doi: 10.1016/j.hal.2017.01.004. Epub 2017 Mar 17.
The diatom genus Pseudo-nitzschia (Peragallo) associated with the production of domoic acid (DA), the toxin reposnsible for amnesic shellfish poisoning, is abundant in Scottish waters. A two year study examined the relationship between Pseudo-nitzschia cells in the water column and DA concentration in blue mussels (Mytilus edulis) at two sites, and king scallops (Pecten maximus) at one site. The rate of DA uptake and depuration differed greatly between the two species with M. edulis whole tissue accumulating and depurating 7μgg (now expressed as mgkg) per week. In contrast, it took 12 weeks for DA to depurate from P. maximus gonad tissue from a concentration of 68μgg (now mgkg) to <20μgg (now mgkg). The DA depuration rate from P. maximus whole tissue was <5% per week during both years of the study. Correlations between the Pseudo-nitzschia cell densities and toxin concentrations were weak to moderate for M. edulis and weak for P. maximus. Seasonal diversity on a species level was observed within the Pseudo-nitzschia genus at both sites with more DA toxicity associated with summer/autumn Pseudo-nitzschia blooms when P. australis was observed in phytoplankton samples. This study reveals the marked difference in DA uptake and depuration in two shellfish species of commercial importance in Scotland. The use of these shellfish species to act as a proxy for DA in the environment still requires investigation.
与产生软骨藻酸 (DA) 有关的硅藻属假菱形藻（Peragallo）是苏格兰水域中丰富的物种，DA 是导致失忆性贝类中毒的毒素。一项为期两年的研究调查了水柱中假菱形藻细胞与两个地点的贻贝（Mytilus edulis）和一个地点的扇贝（Pecten maximus）中 DA 浓度之间的关系。两种物种的 DA 吸收和排泄率差异很大，M. edulis 整个组织每周积累和排泄 7μgg（现表示为 mgkg）。相比之下，P. maximus 性腺组织中的 DA 需要 12 周才能从 68μgg（现表示为 mgkg）降至 <20μgg（现表示为 mgkg）。在研究的两年中，P. maximus 整个组织中的 DA 排泄率每周都低于 5%。M. edulis 和 P. maximus 的 Pseudo-nitzschia 细胞密度与毒素浓度之间的相关性较弱至中等，而 P. maximus 的相关性较弱。在两个地点，在属内观察到 Pseudo-nitzschia 物种的季节性多样性，当浮游植物样本中观察到 P. australis 时，与夏季/秋季 Pseudo-nitzschia 水华相关的 DA 毒性更高。这项研究揭示了苏格兰两种具有商业重要性的贝类物种在 DA 吸收和排泄方面的显著差异。仍需要研究这些贝类物种作为环境中 DA 的替代物的用途。
