An Assessment of Photosynthetic Activity in Large Benthic Foraminifers and the Optimization of Light Intensity for Lab-scale Cultivation

Q3 Environmental Science Journal of Water and Environment Technology Pub Date : 2021-01-01 DOI:10.2965/JWET.20-136

Shumona Akther, Wenzhao Sun, P. Pokhrel, Jumpei Suzuki, M. Fujita

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引用次数: 1

Abstract

We assessed the photosynthetic efficiency of the lab-cultured large benthic foraminifers (LBFs), Calcarina gaudichaudii and Baculogypsina sphaerulata, by means of a pulse-amplitude-modulated (PAM) fluorometer for representative photosynthetic activity; and identified an optimal light intensity and water temperature for the lab-scale cultivation. It is known that in the actual environment, the convex side of LBFs exhibit higher photosynthetic efficiency [Y(II)] than concave one. However, our experimental results from the lab setting showed that Y(II) values apparently did not differ on the basis of their having convex and concave sides. This was due to the condition between the position of the LBFs within the glass vial and light irradiation. The LBFs were exposed to eleven different light conditions for a period of 72 h. The LBFs exhibited relatively higher Y(II) at 40−120 and 240 lum/ft2, compared with that at 1150−1800 lum/ft2. Using a light intensity of 80 lum/ft2 and water temperature of 20°C to inhibit epiphyte infestation due to the growth of suspended microalgae released by the LBF hosts, LBFs were able to be cultured for 120 d under laboratory conditions, while B. sphaerulata could be cultured for 57 d under the on-site conditions in a previous study.

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大型底栖有孔虫光合活性评估及实验室培养光强优化

我们评估了实验室培养的大型底栖有孔虫(LBFs)， Calcarina gaudichadii和杆状虫(Baculogypsina sphaerulata)的光合效率，采用脉冲幅度调制(PAM)荧光仪测量具有代表性的光合活性;并确定了实验室规模培养的最佳光照强度和水温。已知在实际环境中，lbf的凸面比凹面具有更高的光合效率[Y(II)]。然而，我们在实验室环境下的实验结果表明，Y(II)值显然没有因为它们有凸边和凹边而有所不同。这是由于lbf在玻璃小瓶内的位置和光照射之间的条件。LBFs在11种不同的光照条件下暴露72 h，与1150 ~ 1800 lum/ft2相比，在40 ~ 120和240 lum/ft2下，LBFs表现出相对较高的Y(II)。在光照强度为80 μ m/ft2、水温为20℃的条件下，抑制寄主释放的悬浮微藻对附生真菌的侵染，在实验室条件下，LBF可培养120 d，而在之前的研究中，在现场条件下，B. sphaerulata可培养57 d。

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来源期刊

Journal of Water and Environment Technology Environmental Science-Water Science and Technology

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

43 weeks

期刊介绍： The Journal of Water and Environment Technology is an Open Access, fully peer-reviewed international journal for all aspects of the science, technology and management of water and the environment. The journal’s articles are clearly placed in a broader context to be relevant and interesting to our global audience of researchers, engineers, water technologists, and policy makers. JWET is the official journal of the Japan Society on Water Environment (JSWE) published in English, and welcomes submissions that take basic, applied or modeling approaches to the interesting issues facing the field. Topics can include, but are not limited to: water environment, soil and groundwater, drinking water, biological treatment, physicochemical treatment, sludge and solid waste, toxicity, public health and risk assessment, test and analytical methods, environmental education and other issues. JWET also welcomes seminal studies that help lay the foundations for future research in the field. JWET is committed to an ethical, fair and rapid peer-review process. It is published six times per year. It has two article types: Original Articles and Review Articles.