Fridolfsson Emil, Lindehoff Elin, Legrand Catherine, Hylander Samuel
Centre for Ecology and Evolution in Microbial Model Systems - EEMiS, Department of Biology and Environmental Science, Linnaeus University, Pedalstråket 13, SE-39231 Kalmar, Sweden.
J Plankton Res. 2020 May;42(3):274-285. doi: 10.1093/plankt/fbaa015. Epub 2020 Apr 27.
Thiamin (vitamin B) is primarily produced by bacteria and phytoplankton in aquatic food webs and transferred by ingestion to higher trophic levels. However, much remains unknown regarding production, content and transfer of this water-soluble, essential micronutrient. Hence, the thiamin content of six phytoplankton species from different taxa was investigated, along with the effect of thiamin amendment on thiamin content. Furthermore, thiamin transfer to copepods was estimated in feeding experiments. Prey type, not phytoplankton thiamin content , was the most important factor for the transfer of thiamin, as it was lowest from filamentous Cyanophyceae and highest from more easily ingested prey like and . Cyanophyceae had the highest thiamin content of the investigated species, eightfold higher than the lowest. Phytoplankton varied in thiamin content related to the supply of thiamin, where thiamin addition enabled higher thiamin content in some species, while copepod thiamin content was less variable. In all, thiamin transfer is not only dependent on the prey thiamin content, but also the edibility and/or digestibility is of importance. Thiamin is essential for all organisms, and this study constitutes an important building block to understanding the dynamics and transfer of thiamin in the aquatic food web.
硫胺素（维生素B）主要由水生食物网中的细菌和浮游植物产生，并通过摄食传递到更高营养级。然而，关于这种水溶性必需微量营养素的产生、含量和转移，仍有许多未知之处。因此，研究了来自不同分类群的六种浮游植物的硫胺素含量，以及硫胺素添加对硫胺素含量的影响。此外，在摄食实验中估计了硫胺素向桡足类动物的转移。猎物类型而非浮游植物的硫胺素含量是硫胺素转移的最重要因素，因为从丝状蓝藻转移的硫胺素最低，而从更容易摄食的猎物（如[此处原文缺失具体猎物名称]和[此处原文缺失具体猎物名称]）转移的硫胺素最高。在所研究的物种中，蓝藻的硫胺素含量最高，比最低的高八倍。浮游植物的硫胺素含量因硫胺素供应情况而异；添加硫胺素可使某些物种的硫胺素含量升高，而桡足类动物的硫胺素含量变化较小。总之，硫胺素的转移不仅取决于猎物的硫胺素含量，其可食性和/或消化率也很重要。硫胺素对所有生物都至关重要，本研究是理解硫胺素在水生食物网中的动态和转移的重要基石。
