Agasild Helen, Tõnno Ilmar, Ferraz Margarita E Gonzales, Nõges Peeter, Zingel Priit, Tuvikene Lea, Freiberg René, Nõges Tiina, Panksep Kristel
Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 51006 Tartu, Estonia.
Institute of Technology, University of Tartu, 50411 Tartu, Estonia.
Toxins (Basel). 2025 Jun 12;17(6):298. doi: 10.3390/toxins17060298.
is often a dominant cladoceran zooplankton species in water bodies experiencing harmful cyanobacterial blooms. However, its relationship with toxin-producing algae remains largely unexplored. In this study, the feeding behavior of on colonial cyanobacteria and potentially toxic was investigated in a temperate, shallow, eutrophic lake. Liquid chromatographic analyses of phytoplankton marker pigments in gut content revealed that pigments characteristic of cyanobacteria (identified a zeaxanthin, echinenone, and canthaxanthin) comprised the majority of its diet. Among them, colonial cyanobacteria (marked by the pigment canthaxanthin) were the highly preferred food source despite their minor contribution to phytoplankton biomass. qPCR targeting genus-specific synthase genes, which are involved in microcystin biosynthesis, indicated that potentially toxic strains of were present in gut content throughout its temporal and spatial presence in the lake. The results suggest that the common small cladoceran in eutrophic waters, , has a close trophic interaction with colonial cyanobacteria (including ) and may represent an important vector for transferring toxigenic to the food web, even under conditions of low biomass in the lake water.
在经历有害蓝藻水华的水体中，通常是优势枝角类浮游动物物种。然而，它与产毒素藻类的关系在很大程度上仍未得到探索。在本研究中，在一个温带、浅水、富营养化湖泊中研究了其对群体蓝藻和潜在有毒蓝藻的摄食行为。对其肠道内容物中浮游植物标记色素的液相色谱分析表明，蓝藻特有的色素（鉴定为玉米黄质、海胆酮和角黄素）占其食物的大部分。其中，群体蓝藻（以角黄素为标记）是高度偏好的食物来源，尽管它们在浮游植物生物量中所占比例较小。针对参与微囊藻毒素生物合成的蓝藻属特异性聚酮合酶基因的定量聚合酶链反应表明，在其在湖泊中的整个时间和空间存在过程中，其肠道内容物中都存在潜在有毒的蓝藻菌株。结果表明，富营养化水体中常见的小型枝角类动物与群体蓝藻（包括蓝藻）具有密切的营养相互作用，并且即使在湖水中蓝藻生物量较低的情况下，也可能是将产毒蓝藻转移到食物网的重要载体。
