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Effect of water velocity on the physiology of a collapsing Sargassum siliquastrum canopy under a controlled environment
Phycological Research ( IF 1.5 ) Pub Date : 2020-08-25 , DOI: 10.1111/pre.12437 Yukio Inoue 1 , Ryuta Terada 2 , Dominic F. C. Belleza 1 , Gregory N. Nishihara 3
Phycological Research ( IF 1.5 ) Pub Date : 2020-08-25 , DOI: 10.1111/pre.12437 Yukio Inoue 1 , Ryuta Terada 2 , Dominic F. C. Belleza 1 , Gregory N. Nishihara 3
Affiliation
Seaweed beds form a canopy affecting water flow in and around them, and therefore affect mass transport processes between the canopy and the surrounding seawater. Nutrients and physiological byproducts are transferred to and from the bulk seawater and the macroalgae surface, where they are absorbed or released. A change in the canopy structure caused by the interaction of the canopy with water motion affects mass transport and therefore affects physiological rates. Many previous studies reported that photosynthesis and nutrient uptake rates increase as water velocity increases, and recent studies have begun to examine how the interaction between water velocity and canopies affects mass transport. To elucidate how this interaction can affect the physiology of macroalgae, we measured the spatial distribution of water velocity around and in a Sargassum siliquastrum canopy and examined its impact on photosynthesis and dark respiration in a re‐circulating flume. We examined eight water velocities ranging from 0.5 to 40 cm s−1 and three canopy densities, where the spacings between individuals were 4, 6, and 8 cm. Dissolved oxygen concentrations were measured at each velocity for 2 h under dark conditions and for 1 h under 800 μmol photons m−2 s−1. As water velocity increased, the canopy began to bend with the flow and collapse, which was quantified by digital images. The gross photosynthesis rate and the dark respiration rate of the canopy increased as water velocity increased. However, the gross photosynthesis rates began to decrease beyond 9 cm s−1, whereas the dark respiration rates began to decrease beyond 4 cm s−1. Canopy density did not influence either of the rates. We conclude that increasing water velocities led to a collapse of the canopy, which inhibited water exchange between the canopy exterior and interior, and further led to the decline in physiological rates at high water velocity.
中文翻译:
受控环境下水速对倒塌的马尾藻冠层生理的影响
海藻床形成一个树冠,影响它们内部和周围的水流,从而影响树冠与周围海水之间的物质传输过程。营养物质和生理副产品被转移到大量海水和大型藻类表面,在那里它们被吸收或释放。由冠层与水运动的相互作用引起的冠层结构的变化会影响质量传输,从而影响生理速率。许多先前的研究报告说,光合作用和养分吸收率随着水流速度的增加而增加,最近的研究已经开始研究水流速度和冠层之间的相互作用如何影响质量传输。为了阐明这种相互作用如何影响大型藻类的生理机能,我们测量了马尾藻冠层周围和内部水流速度的空间分布,并检查了它对循环水槽中光合作用和暗呼吸的影响。我们检查了从 0.5 到 40 cm s-1 的八种水速和三种冠层密度,其中个体之间的间距为 4、6 和 8 cm。溶解氧浓度在黑暗条件下以每个速度测量 2 小时,在 800 μmol 光子 m-2 s-1 下测量 1 小时。随着水流速度的增加,树冠开始随着流动和坍塌而弯曲,这可以通过数字图像进行量化。冠层的总光合速率和暗呼吸速率随着水流速度的增加而增加。然而,总光合作用速率开始下降超过 9 cm s−1,而暗呼吸率开始下降超过 4 cm s−1。冠层密度不影响任一比率。我们得出结论,增加的水速导致冠层塌陷,抑制了冠层外部和内部之间的水交换,并进一步导致高水速下的生理速率下降。
更新日期:2020-08-25
中文翻译:
受控环境下水速对倒塌的马尾藻冠层生理的影响
海藻床形成一个树冠,影响它们内部和周围的水流,从而影响树冠与周围海水之间的物质传输过程。营养物质和生理副产品被转移到大量海水和大型藻类表面,在那里它们被吸收或释放。由冠层与水运动的相互作用引起的冠层结构的变化会影响质量传输,从而影响生理速率。许多先前的研究报告说,光合作用和养分吸收率随着水流速度的增加而增加,最近的研究已经开始研究水流速度和冠层之间的相互作用如何影响质量传输。为了阐明这种相互作用如何影响大型藻类的生理机能,我们测量了马尾藻冠层周围和内部水流速度的空间分布,并检查了它对循环水槽中光合作用和暗呼吸的影响。我们检查了从 0.5 到 40 cm s-1 的八种水速和三种冠层密度,其中个体之间的间距为 4、6 和 8 cm。溶解氧浓度在黑暗条件下以每个速度测量 2 小时,在 800 μmol 光子 m-2 s-1 下测量 1 小时。随着水流速度的增加,树冠开始随着流动和坍塌而弯曲,这可以通过数字图像进行量化。冠层的总光合速率和暗呼吸速率随着水流速度的增加而增加。然而,总光合作用速率开始下降超过 9 cm s−1,而暗呼吸率开始下降超过 4 cm s−1。冠层密度不影响任一比率。我们得出结论,增加的水速导致冠层塌陷,抑制了冠层外部和内部之间的水交换,并进一步导致高水速下的生理速率下降。