Response of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea

In South Korea, sixteen multifunctional weirs were constructed on four major rivers (Han, Nakdong, Geum, Yeongsan) from 2009 to 2012. Hydrological changes resulting from weir construction altered the physical, chemical, and biological characteristics of natural large rivers. We aimed to investigate...

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Autores principales:	Kyung-Lak Lee, Jae Sin Choi, Jae-Hak Lee, Kang-Young Jung, Han Soon Kim
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Weir Nakdong River Epilithic diatom Hydraulic retention time Land use Diatom trophic index Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/0177a8c543264d82a0e0d140883a6b27
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spelling	oai:doaj.org-article:0177a8c543264d82a0e0d140883a6b272021-12-01T04:51:51ZResponse of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea1470-160X10.1016/j.ecolind.2021.107711https://doaj.org/article/0177a8c543264d82a0e0d140883a6b272021-07-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21003769https://doaj.org/toc/1470-160XIn South Korea, sixteen multifunctional weirs were constructed on four major rivers (Han, Nakdong, Geum, Yeongsan) from 2009 to 2012. Hydrological changes resulting from weir construction altered the physical, chemical, and biological characteristics of natural large rivers. We aimed to investigate the variation in epilithic assemblages responding to changes in physicochemical, meteorological, and hydrological variables in the eight weir (lentic) sections of the Nakdong River, which is the longest river in South Korea. Sampling was conducted to determine the influence of environmental parameters on community composition, and to monitor the seasonality of environmental and biological patterns.A total of 173 taxa including 26 major epilithic diatom taxa were identified. Among them, nutrient-tolerant diatom species were characterized by Cyclostephanos dubius, Navicula gregaria, Fragilaria crotonensis, Aulacoseira granulata, Melosira varians, Navicula minima, Nitzschia amphibia, Amphora pediculus, and Nitzschia inconspicua. These species were primarily dominant in the midstream and downstream weir sections of the river adjacent to urban-industrial land use zones relating to nutrient enrichment. Moreover, preference for longer hydraulic retention time (HRT) was identified in C. dubius, N. gregaria, and F. crotonensis, in addition to its tolerance for high nutrition. Redundancy analysis based on the relative abundance of diatom taxa demonstrated that the diatom assemblage composition was closely related to total nitrogen (TN), total phosphorus (TP), phosphate phosphorus (PO4-P), electrical conductivity, precipitation, water discharge, and HRT. Variation partitioning analysis further revealed that hydrological-meteorological variables play a synergistic role in enhancing the function of physical and chemical variables in structuring diatom assemblage composition soon after weir construction. A generalized linear model using the Akaike’s information criterion also suggests that the trophic diatom index (TDI) could indicate the water quality status in the weir sections, as the TDI was positively correlated (p < 0.05) with nutrients (TN and PO4-P). Our findings inform the applicability of using the TDI for efficiently monitoring and managing the water quality of consecutive weir sections of the Nakdong River and the weir systems of other rivers in temperate regions.Kyung-Lak LeeJae Sin ChoiJae-Hak LeeKang-Young JungHan Soon KimElsevierarticleWeirNakdong RiverEpilithic diatomHydraulic retention timeLand useDiatom trophic indexEcologyQH540-549.5ENEcological Indicators, Vol 126, Iss , Pp 107711- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Weir Nakdong River Epilithic diatom Hydraulic retention time Land use Diatom trophic index Ecology QH540-549.5
spellingShingle	Weir Nakdong River Epilithic diatom Hydraulic retention time Land use Diatom trophic index Ecology QH540-549.5 Kyung-Lak Lee Jae Sin Choi Jae-Hak Lee Kang-Young Jung Han Soon Kim Response of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea
description	In South Korea, sixteen multifunctional weirs were constructed on four major rivers (Han, Nakdong, Geum, Yeongsan) from 2009 to 2012. Hydrological changes resulting from weir construction altered the physical, chemical, and biological characteristics of natural large rivers. We aimed to investigate the variation in epilithic assemblages responding to changes in physicochemical, meteorological, and hydrological variables in the eight weir (lentic) sections of the Nakdong River, which is the longest river in South Korea. Sampling was conducted to determine the influence of environmental parameters on community composition, and to monitor the seasonality of environmental and biological patterns.A total of 173 taxa including 26 major epilithic diatom taxa were identified. Among them, nutrient-tolerant diatom species were characterized by Cyclostephanos dubius, Navicula gregaria, Fragilaria crotonensis, Aulacoseira granulata, Melosira varians, Navicula minima, Nitzschia amphibia, Amphora pediculus, and Nitzschia inconspicua. These species were primarily dominant in the midstream and downstream weir sections of the river adjacent to urban-industrial land use zones relating to nutrient enrichment. Moreover, preference for longer hydraulic retention time (HRT) was identified in C. dubius, N. gregaria, and F. crotonensis, in addition to its tolerance for high nutrition. Redundancy analysis based on the relative abundance of diatom taxa demonstrated that the diatom assemblage composition was closely related to total nitrogen (TN), total phosphorus (TP), phosphate phosphorus (PO4-P), electrical conductivity, precipitation, water discharge, and HRT. Variation partitioning analysis further revealed that hydrological-meteorological variables play a synergistic role in enhancing the function of physical and chemical variables in structuring diatom assemblage composition soon after weir construction. A generalized linear model using the Akaike’s information criterion also suggests that the trophic diatom index (TDI) could indicate the water quality status in the weir sections, as the TDI was positively correlated (p < 0.05) with nutrients (TN and PO4-P). Our findings inform the applicability of using the TDI for efficiently monitoring and managing the water quality of consecutive weir sections of the Nakdong River and the weir systems of other rivers in temperate regions.
format	article
author	Kyung-Lak Lee Jae Sin Choi Jae-Hak Lee Kang-Young Jung Han Soon Kim
author_facet	Kyung-Lak Lee Jae Sin Choi Jae-Hak Lee Kang-Young Jung Han Soon Kim
author_sort	Kyung-Lak Lee
title	Response of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea
title_short	Response of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea
title_full	Response of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea
title_fullStr	Response of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea
title_full_unstemmed	Response of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea
title_sort	response of epilithic diatom assemblages to weir construction on the nakdong river, republic of korea
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/0177a8c543264d82a0e0d140883a6b27
work_keys_str_mv	AT kyunglaklee responseofepilithicdiatomassemblagestoweirconstructiononthenakdongriverrepublicofkorea AT jaesinchoi responseofepilithicdiatomassemblagestoweirconstructiononthenakdongriverrepublicofkorea AT jaehaklee responseofepilithicdiatomassemblagestoweirconstructiononthenakdongriverrepublicofkorea AT kangyoungjung responseofepilithicdiatomassemblagestoweirconstructiononthenakdongriverrepublicofkorea AT hansoonkim responseofepilithicdiatomassemblagestoweirconstructiononthenakdongriverrepublicofkorea
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Response of epilithic diatom assemblages to weir construction on the Nakdong River, Republic of Korea

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