Submersed macrophyte restoration with artificial light-emitting diodes: A mesocosm experiment

Urban lakes are important natural assets but are exposed to multiple stressors from human activities. Submersed macrophytes, a key plant group that helps to maintain clear-water conditions in lakes, tend to be scarce in urban lakes, particularly when they are eutrophic or hypertrophic, and their los...

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Autores principales:	Ye-Xin Yu, Yan Li, Hai-Jun Wang, Xiao-Dong Wu, Miao Zhang, Hong-Zhu Wang, David P. Hamilton, Erik Jeppesen
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	LED Macrophyte restoration Urban lakes Eutrophication Environmental pollution TD172-193.5 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/544996962f884808991698ca27979d84
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spelling	oai:doaj.org-article:544996962f884808991698ca27979d842021-12-02T04:58:57ZSubmersed macrophyte restoration with artificial light-emitting diodes: A mesocosm experiment0147-651310.1016/j.ecoenv.2021.113044https://doaj.org/article/544996962f884808991698ca27979d842021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0147651321011568https://doaj.org/toc/0147-6513Urban lakes are important natural assets but are exposed to multiple stressors from human activities. Submersed macrophytes, a key plant group that helps to maintain clear-water conditions in lakes, tend to be scarce in urban lakes, particularly when they are eutrophic or hypertrophic, and their loss is linked, in part, to impaired underwater light climate. We tested if enhancing the underwater light conditions using light-emitting diodes (LEDs) could restore submersed macrophytes in urban lakes. Twelve mesocosms (1000 L each) were each planted with tape grass (Vallisneria natans) and monitored over three months (22 August–7 November), using a control and three artificial light intensity treatments (10, 50, and 100 µmol m-2 s-1). Compared with the control, the high light treatment (100 µmol m-2 s-1) had higher leaf number, maximum leaf length, and average leaf length (3.9, 5.8, and 2.8 times, respectively). Shoot number, leaf number, leaf dry mass, root dry mass, and photosynthetic photon flux density in the high-light treatment were significantly greater than the control, but root length and phytoplankton chlorophyll a were not related to plant growth variables and were low in all treatments. Periphyton chlorophyll a increased significantly with the plant growth variables (i.e., shoot number, leaf number, and maximum leaf length) and was high in the light treatments but did not hamper the growth of the macrophytes. These results indicate that LED light supplementation enables the growth of V. natans under eutrophic conditions, at least in the absence of fish as in our experiment, and that the method may have potential as a restoration method in urban lakes. Lake-scale studies are needed, however, to fully evaluate LED light supplementation under natural conditions where other stressors (e.g., fish grazing) may need to be controlled for successful restoration of urban lakes.Ye-Xin YuYan LiHai-Jun WangXiao-Dong WuMiao ZhangHong-Zhu WangDavid P. HamiltonErik JeppesenElsevierarticleLEDMacrophyte restorationUrban lakesEutrophicationEnvironmental pollutionTD172-193.5Environmental sciencesGE1-350ENEcotoxicology and Environmental Safety, Vol 228, Iss , Pp 113044- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	LED Macrophyte restoration Urban lakes Eutrophication Environmental pollution TD172-193.5 Environmental sciences GE1-350
spellingShingle	LED Macrophyte restoration Urban lakes Eutrophication Environmental pollution TD172-193.5 Environmental sciences GE1-350 Ye-Xin Yu Yan Li Hai-Jun Wang Xiao-Dong Wu Miao Zhang Hong-Zhu Wang David P. Hamilton Erik Jeppesen Submersed macrophyte restoration with artificial light-emitting diodes: A mesocosm experiment
description	Urban lakes are important natural assets but are exposed to multiple stressors from human activities. Submersed macrophytes, a key plant group that helps to maintain clear-water conditions in lakes, tend to be scarce in urban lakes, particularly when they are eutrophic or hypertrophic, and their loss is linked, in part, to impaired underwater light climate. We tested if enhancing the underwater light conditions using light-emitting diodes (LEDs) could restore submersed macrophytes in urban lakes. Twelve mesocosms (1000 L each) were each planted with tape grass (Vallisneria natans) and monitored over three months (22 August–7 November), using a control and three artificial light intensity treatments (10, 50, and 100 µmol m-2 s-1). Compared with the control, the high light treatment (100 µmol m-2 s-1) had higher leaf number, maximum leaf length, and average leaf length (3.9, 5.8, and 2.8 times, respectively). Shoot number, leaf number, leaf dry mass, root dry mass, and photosynthetic photon flux density in the high-light treatment were significantly greater than the control, but root length and phytoplankton chlorophyll a were not related to plant growth variables and were low in all treatments. Periphyton chlorophyll a increased significantly with the plant growth variables (i.e., shoot number, leaf number, and maximum leaf length) and was high in the light treatments but did not hamper the growth of the macrophytes. These results indicate that LED light supplementation enables the growth of V. natans under eutrophic conditions, at least in the absence of fish as in our experiment, and that the method may have potential as a restoration method in urban lakes. Lake-scale studies are needed, however, to fully evaluate LED light supplementation under natural conditions where other stressors (e.g., fish grazing) may need to be controlled for successful restoration of urban lakes.
format	article
author	Ye-Xin Yu Yan Li Hai-Jun Wang Xiao-Dong Wu Miao Zhang Hong-Zhu Wang David P. Hamilton Erik Jeppesen
author_facet	Ye-Xin Yu Yan Li Hai-Jun Wang Xiao-Dong Wu Miao Zhang Hong-Zhu Wang David P. Hamilton Erik Jeppesen
author_sort	Ye-Xin Yu
title	Submersed macrophyte restoration with artificial light-emitting diodes: A mesocosm experiment
title_short	Submersed macrophyte restoration with artificial light-emitting diodes: A mesocosm experiment
title_full	Submersed macrophyte restoration with artificial light-emitting diodes: A mesocosm experiment
title_fullStr	Submersed macrophyte restoration with artificial light-emitting diodes: A mesocosm experiment
title_full_unstemmed	Submersed macrophyte restoration with artificial light-emitting diodes: A mesocosm experiment
title_sort	submersed macrophyte restoration with artificial light-emitting diodes: a mesocosm experiment
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/544996962f884808991698ca27979d84
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Submersed macrophyte restoration with artificial light-emitting diodes: A mesocosm experiment

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