Phytoplankton shifts in the Central Bohai Sea over the last 250 years reflect eutrophication and input from the Yellow River

Phytoplankton shifts driven by the environmental changes can significantly impact the functioning of marine ecosystems. Analyzing time series data is an important way to understand how phytoplankton responds to environmental changes. Here, multiple indicators, including diatoms and dinoflagellate cy...

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Autores principales:	Lei Li, Yujue Wang, Dongyan Liu
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Diatom frustules Dinoflagellate cysts Sediment core Paleoecology Organic matter Carbon and nitrogen isotopes Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/6aafd20abcf9411f91afc2f5ba0ac87b
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spelling	oai:doaj.org-article:6aafd20abcf9411f91afc2f5ba0ac87b2021-12-01T04:50:59ZPhytoplankton shifts in the Central Bohai Sea over the last 250 years reflect eutrophication and input from the Yellow River1470-160X10.1016/j.ecolind.2021.107676https://doaj.org/article/6aafd20abcf9411f91afc2f5ba0ac87b2021-07-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21003411https://doaj.org/toc/1470-160XPhytoplankton shifts driven by the environmental changes can significantly impact the functioning of marine ecosystems. Analyzing time series data is an important way to understand how phytoplankton responds to environmental changes. Here, multiple indicators, including diatoms and dinoflagellate cysts, total organic matter, carbon and nitrogen isotopes, and biosilicate, were analyzed in the sediment core from the Central Bohai Sea. A 250-year palaeo-environment was reconstructed based on these indicators to examine the responses of phytoplankton assemblages to environmental events. Two significant shifting points were identified from the varying trend of diatoms and cysts. The first one occurred in the 1850s, when the Yellow River outlet relocated from the southern Yellow Sea to the Bohai Sea, as evidenced by finer grain size and lower sea salinity, causing a significant increase in total biomass and brackish species. The other shift happened in the 1970s, when significantly increased fertilizer usage and wastewater discharge led to more organic matter in the core and nitrogen enrichment in the water column up to the 2010s, causing a marked increase in total biomass, small-sized species, and harmful algal bloom species. Redundancy analysis between major community shifts and environmental factors indicated that the Yellow River input and nutrient enrichment had a more important role in regulating phytoplankton shifts than rising temperature after the 1970s.Lei LiYujue WangDongyan LiuElsevierarticleDiatom frustulesDinoflagellate cystsSediment corePaleoecologyOrganic matterCarbon and nitrogen isotopesEcologyQH540-549.5ENEcological Indicators, Vol 126, Iss , Pp 107676- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Diatom frustules Dinoflagellate cysts Sediment core Paleoecology Organic matter Carbon and nitrogen isotopes Ecology QH540-549.5
spellingShingle	Diatom frustules Dinoflagellate cysts Sediment core Paleoecology Organic matter Carbon and nitrogen isotopes Ecology QH540-549.5 Lei Li Yujue Wang Dongyan Liu Phytoplankton shifts in the Central Bohai Sea over the last 250 years reflect eutrophication and input from the Yellow River
description	Phytoplankton shifts driven by the environmental changes can significantly impact the functioning of marine ecosystems. Analyzing time series data is an important way to understand how phytoplankton responds to environmental changes. Here, multiple indicators, including diatoms and dinoflagellate cysts, total organic matter, carbon and nitrogen isotopes, and biosilicate, were analyzed in the sediment core from the Central Bohai Sea. A 250-year palaeo-environment was reconstructed based on these indicators to examine the responses of phytoplankton assemblages to environmental events. Two significant shifting points were identified from the varying trend of diatoms and cysts. The first one occurred in the 1850s, when the Yellow River outlet relocated from the southern Yellow Sea to the Bohai Sea, as evidenced by finer grain size and lower sea salinity, causing a significant increase in total biomass and brackish species. The other shift happened in the 1970s, when significantly increased fertilizer usage and wastewater discharge led to more organic matter in the core and nitrogen enrichment in the water column up to the 2010s, causing a marked increase in total biomass, small-sized species, and harmful algal bloom species. Redundancy analysis between major community shifts and environmental factors indicated that the Yellow River input and nutrient enrichment had a more important role in regulating phytoplankton shifts than rising temperature after the 1970s.
format	article
author	Lei Li Yujue Wang Dongyan Liu
author_facet	Lei Li Yujue Wang Dongyan Liu
author_sort	Lei Li
title	Phytoplankton shifts in the Central Bohai Sea over the last 250 years reflect eutrophication and input from the Yellow River
title_short	Phytoplankton shifts in the Central Bohai Sea over the last 250 years reflect eutrophication and input from the Yellow River
title_full	Phytoplankton shifts in the Central Bohai Sea over the last 250 years reflect eutrophication and input from the Yellow River
title_fullStr	Phytoplankton shifts in the Central Bohai Sea over the last 250 years reflect eutrophication and input from the Yellow River
title_full_unstemmed	Phytoplankton shifts in the Central Bohai Sea over the last 250 years reflect eutrophication and input from the Yellow River
title_sort	phytoplankton shifts in the central bohai sea over the last 250 years reflect eutrophication and input from the yellow river
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/6aafd20abcf9411f91afc2f5ba0ac87b
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Phytoplankton shifts in the Central Bohai Sea over the last 250 years reflect eutrophication and input from the Yellow River

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