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首页> 外文期刊>Harmful Algae >Ingestion and clearance rates of the red Noctiluca scintillans fed on the toxic dinoflagellate Alexandrium minutum (Halim)
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Ingestion and clearance rates of the red Noctiluca scintillans fed on the toxic dinoflagellate Alexandrium minutum (Halim)

机译：以有毒的鞭毛藻亚历山大藻（哈林）为食的红色夜光闪烁藻的摄取和清除率

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摘要

In this study, we evaluated the ingestion and clearance rates of the heterotrophic dinoflagellate Noctiluca scintillans (Macartney) fed on the toxic microalgae Alexandrium minutum Halim in laboratory cultures. Specimens of the red form of N. scintillans were collected in the Ria de Vigo and kept in culture. The results showed that N. scintillans actively fed on A minutum, with maximum ingestion rates of 0.37μgCind-1 day-1, showing that there was non-satiated feeding by N. scintillans on A minutum. The mean cellular toxin content of A minutum in the stock culture ranged from 2.57 to 3.44 fmol cell-1. The HPLC analyses of the extracts from N. scintillans fed with 4 different abundances of A minutum revealed no detectable amounts of toxin. This suggested that although N. scintillans was able to ingest a toxic dinoflagellate such as A minutum into its vacuoles, the ingested toxin was bioconverted or excreted by Noctiluca. Our findings support the theory that Noctiluca may inflict grazing pressure on the growth of Paralytic Shellfish Toxin (PST) species in the field, and could therefore play an important role as a regulator against PST-producing phytoplankton. This is the first report about grazing rates of N. scintillans on Alexandrium cells.
机译：在这项研究中，我们评估了在实验室培养物中以有毒微藻亚历山大草哈利姆为食的异养二鞭毛藻夜蛾（Macartney）的摄入和清除率。闪烁红猪笼草的红色标本收集在维拉河中，并进行培养。结果表明，闪烁神经节食杆菌主动摄食A minutum，最大摄食率为0.37μgCind-1day-1，这表明闪烁藻对N minutumum有不饱足的摄食。在原种培养物中A minutum的平均细胞毒素含量范围为2.57至3.44 fmol cell-1。 HPLC分析了饲喂4种不同丰富量的A. minutum的闪烁猪笼草的提取物，未发现可检测量的毒素。这表明尽管闪烁神经猪能够将有毒的鞭毛鞭毛藻（如小茴香）摄入其液泡中，但摄取的毒素却被夜光藻生物转化或排泄了。我们的研究结果支持了夜光藻可能在野外对麻痹性贝类毒素（PST）物种的生长施加放牧压力的理论，因此可以作为生产PST浮游植物的调节剂发挥重要作用。这是关于亚历​​山大藻细胞上闪烁神经猪放牧率的第一份报告。

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