Fridolfsson Emil, Majaneva Sanna, Hylander Samuel
Department of Biology and Environmental Sciences, Centre for Ecology and Evolution in Microbial model Systems - EEMiS, Linnaeus University, Kalmar SE-39182, Sweden.
Norwegian University of Science and Technology, Department of Biology / Trondhjem Biological Station, Trondheim NO-7491, Norway.
J Plankton Res. 2023 Feb 1;45(2):360-371. doi: 10.1093/plankt/fbad004. eCollection 2023 Mar-Apr.
Vitamin B (thiamin) is primarily produced by bacteria, phytoplankton and fungi in aquatic food webs and transferred to higher trophic levels by ingestion. However, much remains unknown regarding the dynamics this water-soluble, essential micronutrient; e.g. how it relates to macronutrients (carbon, nitrogen and phosphorous). Nutrient limitation has been found to be related to periods of thiamin deficiency as well as in models. Hence, thiamin transfer to copepods from three phytoplankton species from different taxa was investigated, along with the effect of various nutrient regimes on thiamin content. Nutrient levels did not affect thiamin content of phytoplankton nor the transfer to copepods. Instead, phytoplankton displayed species-specific thiamin and macronutrient contents and whilst a higher thiamin content in the prey lead to higher levels in copepods, the transfer was lower for compared to and . In all, thiamin transfer to copepods is not only dependent on thiamin content of the prey, but also the edibility and/or digestibility is of importance. Thiamin is essential for all organisms, and this study offers insights into the limited effect of macronutrients on the dynamics and transfer of thiamin in the aquatic food webs.
维生素B（硫胺素）主要由水生食物网中的细菌、浮游植物和真菌产生，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动态变化仍有许多未知之处；例如，它与大量营养素（碳、氮和磷）的关系。已发现营养限制与硫胺素缺乏期以及模型中的情况有关。因此，研究了三种不同分类群的浮游植物向桡足类动物的硫胺素转移情况，以及各种营养状况对硫胺素含量的影响。营养水平既不影响浮游植物的硫胺素含量，也不影响向桡足类动物的转移。相反，浮游植物表现出物种特异性的硫胺素和大量营养素含量，虽然猎物中较高的硫胺素含量会导致桡足类动物体内硫胺素水平升高，但与[具体物种1]和[具体物种2]相比，[具体物种3]的转移率较低。总之，硫胺素向桡足类动物的转移不仅取决于猎物中的硫胺素含量，其可食性和/或消化率也很重要。硫胺素对所有生物都是必不可少的，这项研究揭示了大量营养素对水生食物网中硫胺素动态和转移的有限影响。
