Department of Ecology, Institute for Biological Research "Siniša Stanković", University of Belgrade, Bulevar despota Stefana 142, 11060, Belgrade, Serbia.
Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE40530, Göteborg, Sweden.
J Phycol. 2021 Jun;57(3):726-741. doi: 10.1111/jpy.13150. Epub 2021 Mar 28.
Although desmids typically inhabit freshwater environments characterized by low amounts of nutrients and low salinity, several desmid species have been recorded in eutrophic waters, indicating their adaptation to elevated pollution and conductivity. This study aimed to determine whether desmids could be used for remediation of moderately saline aquaculture wastewater (AWW) from a fish farm situated in the southeast of Sweden. Fourteen desmid strains isolated from different climates (tropical to polar) and trophic conditions (oligotrophic to eutrophic) were cultivated in diluted AWW and we estimated their growth rates, biomass, nutrient removal efficiency, chlorophyll fluorescence parameters and cellular C, N and P quotas. Despite being grown at moderate salinity, unfavourable N:P ratio, and relatively low light/temperature regime the eutrophic strains, Cosmarium humile, Cosmarium laeve and a meso-oligotrophic species Cosmarium impressulum, completely absorbed nitrate and phosphate from AWW media after 7 d, indicating their potential for remediation of fish effluents in colder climates. These species, along with the typical eutrophic species, Cosmarium meneghinii and Staurastrum chaetoceras, had biomass in the range 0.45-1.19 g · L while maximum growth rates ranged from 0.36 to 0.51 · d , similar to published rates for several fast-growing green microalgae cultivated in various AWW types. Tropical desmids had distinctly high values of saturating irradiance (I > 1,000 µmol photons · m · s ), and, along with eutrophic desmids, had high potential electron transport (rETR > 155 rel. units). Hence, the desmids studied demonstrated inherent photophysiological responses corresponding to their climate and trophic origin under the suboptimal growth conditions.
尽管鼓藻通常栖息于营养物质和盐度较低的淡水环境中，但已有几种鼓藻物种在富营养化水域中被记录到，这表明它们能够适应升高的污染和电导率。本研究旨在确定鼓藻是否可用于修复位于瑞典东南部的一个鱼类养殖场的中度含盐水产养殖废水（AWW）。从不同气候（热带到极地）和营养条件（贫营养到富营养）中分离出的 14 株鼓藻菌株在稀释的 AWW 中进行培养，并估算了它们的生长率、生物量、养分去除效率、叶绿素荧光参数以及细胞 C、N 和 P 含量。尽管在中等盐度、不利的 N:P 比以及相对较低的光照/温度条件下生长，富营养型菌株 Cosmarium humile、Cosmarium laeve 和一种中营养寡营养型物种 Cosmarium impressulum 仍能在 7 天后完全从 AWW 培养基中吸收硝酸盐和磷酸盐，表明它们具有在较冷气候下修复鱼类废水的潜力。这些物种与典型的富营养型物种 Cosmarium meneghinii 和 Staurastrum chaetoceras 一起，生物量在 0.45-1.19 g·L 范围内，最大生长率范围为 0.36-0.51·d ，与在各种 AWW 类型中培养的几种快速生长的绿藻的已发表速率相似。热带鼓藻具有明显较高的饱和辐照度（I >1,000 μmol 光子·m · s ），并且与富营养型鼓藻一样，具有很高的潜在电子传递速率（rETR >155 rel. units）。因此，在所研究的亚最佳生长条件下，鼓藻表现出与其气候和营养起源相对应的固有生理响应。
