Savannah River Ecology Laboratory, University of Georgia, Aiken, SC, 29802, USA.
Arch Environ Contam Toxicol. 2018 Aug;75(2):273-277. doi: 10.1007/s00244-017-0498-2. Epub 2018 Jan 3.
Plants are an important mode of transfer of contaminants from sediments into food webs. In aquatic ecosystems, contaminant uptake by macrophytes can vary by path of nutrient uptake (roots vs. absorption from water column). Carnivorous plants likely have additional exposure through consumption of small aquatic organisms. This study expanded on previous research suggesting that bladderworts (Genus Utricularia) accumulate radiocesium (Cs) and examined for (1) a potential association between sediment and plant concentrations and (2) differences in Cs accumulation among rooted and free floating Utricularia species. A strong correlation was found between average Cs concentrations in all Utricularia species (combined) and sediments (r = 0.9, p = 0.0374). Among three bladderwort species at common sites, Utricularia floridana, the only rooted species, had higher mean Cs concentrations than Utricularia purpurea, and U. purpurea had a greater mean Cs concentration than Utricularia inflata.
植物是污染物从沉积物向食物网转移的重要途径。在水生生态系统中，大型植物对污染物的吸收途径（根部吸收还是水柱吸收）不同。食虫植物可能通过摄食小型水生生物而受到额外暴露。本研究扩展了先前的研究，表明狸藻（狸藻属）会积累放射性铯（Cs），并检查了（1）沉积物和植物浓度之间的潜在关联，以及（2）有根和自由漂浮狸藻物种之间 Cs 积累的差异。在所有狸藻物种（合并）和沉积物中发现了平均 Cs 浓度之间的强烈相关性（r = 0.9，p = 0.0374）。在常见地点的三种狸藻物种中，唯一有根的物种佛罗里达狸藻的平均 Cs 浓度高于紫红色狸藻，而紫红色狸藻的平均 Cs 浓度高于膨胀狸藻。
