Iron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics

We hypothesize that iron availability plays an important role in driving phytoplankton structure and dynamics in tropical reservoir. This role has often been neglected in routine monitoring of water quality since the main focus has been addressed on macronutrients such phosphorus and nitrogen. To el...

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Autores principales:	Li-Juan Xiao, La-Mei Lei, Liang Peng, Qiu-Qi Lin, Luigi Naselli-Flores
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Year-round cyanobacteria blooms Tropical reservoirs Thermal regime Iron Phytoplankton dynamics Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/54411e47ec09487c8a4c51ed570ed167
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spelling	oai:doaj.org-article:54411e47ec09487c8a4c51ed570ed1672021-12-01T04:46:24ZIron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics1470-160X10.1016/j.ecolind.2021.107446https://doaj.org/article/54411e47ec09487c8a4c51ed570ed1672021-06-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21001114https://doaj.org/toc/1470-160XWe hypothesize that iron availability plays an important role in driving phytoplankton structure and dynamics in tropical reservoir. This role has often been neglected in routine monitoring of water quality since the main focus has been addressed on macronutrients such phosphorus and nitrogen. To elucidate the potential regulation exerted by iron availability on phytoplankton, a limnological investigation was carried out in two neighboring eutrophic reservoirs in tropical China. Traditional physical and chemical variables were measured along with total and dissolved iron concentrations to explore how they could influence phytoplankton structure. Statistical analyses showed that dissolved iron (DFe) as well as dissolved nitrogen (DIN) and soluble reactive phosphorus (SRP) significantly explained the variance of phytoplankton assemblages in both reservoirs. We could also find that diazotrophic cyanobacteria blooms generally developed when DFe concentrations were above 0.025 mg/L. Moreover, the DFe availability in the water columns was modulated by the effects exerted by the stratification/circulation patterns on redox conditions and pH values. Anaerobic conditions favored the release of iron and phosphorus from sediments, and likely favored an enhanced nitrogen assimilation and a decrease of DIN in the epilimnion. Our results highlighted that iron functions as an important factor promoting diazotrophic cyanobacteria and driving seasonal phytoplankton succession in tropical eutrophic reservoirs, not only with a direct effect on phytoplankton growth but also indirect effect by modifying the availability of nitrogen and phosphorus.Li-Juan XiaoLa-Mei LeiLiang PengQiu-Qi LinLuigi Naselli-FloresElsevierarticleYear-round cyanobacteria bloomsTropical reservoirsThermal regimeIronPhytoplankton dynamicsEcologyQH540-549.5ENEcological Indicators, Vol 125, Iss , Pp 107446- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Year-round cyanobacteria blooms Tropical reservoirs Thermal regime Iron Phytoplankton dynamics Ecology QH540-549.5
spellingShingle	Year-round cyanobacteria blooms Tropical reservoirs Thermal regime Iron Phytoplankton dynamics Ecology QH540-549.5 Li-Juan Xiao La-Mei Lei Liang Peng Qiu-Qi Lin Luigi Naselli-Flores Iron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics
description	We hypothesize that iron availability plays an important role in driving phytoplankton structure and dynamics in tropical reservoir. This role has often been neglected in routine monitoring of water quality since the main focus has been addressed on macronutrients such phosphorus and nitrogen. To elucidate the potential regulation exerted by iron availability on phytoplankton, a limnological investigation was carried out in two neighboring eutrophic reservoirs in tropical China. Traditional physical and chemical variables were measured along with total and dissolved iron concentrations to explore how they could influence phytoplankton structure. Statistical analyses showed that dissolved iron (DFe) as well as dissolved nitrogen (DIN) and soluble reactive phosphorus (SRP) significantly explained the variance of phytoplankton assemblages in both reservoirs. We could also find that diazotrophic cyanobacteria blooms generally developed when DFe concentrations were above 0.025 mg/L. Moreover, the DFe availability in the water columns was modulated by the effects exerted by the stratification/circulation patterns on redox conditions and pH values. Anaerobic conditions favored the release of iron and phosphorus from sediments, and likely favored an enhanced nitrogen assimilation and a decrease of DIN in the epilimnion. Our results highlighted that iron functions as an important factor promoting diazotrophic cyanobacteria and driving seasonal phytoplankton succession in tropical eutrophic reservoirs, not only with a direct effect on phytoplankton growth but also indirect effect by modifying the availability of nitrogen and phosphorus.
format	article
author	Li-Juan Xiao La-Mei Lei Liang Peng Qiu-Qi Lin Luigi Naselli-Flores
author_facet	Li-Juan Xiao La-Mei Lei Liang Peng Qiu-Qi Lin Luigi Naselli-Flores
author_sort	Li-Juan Xiao
title	Iron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics
title_short	Iron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics
title_full	Iron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics
title_fullStr	Iron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics
title_full_unstemmed	Iron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics
title_sort	iron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/54411e47ec09487c8a4c51ed570ed167
work_keys_str_mv	AT lijuanxiao ironoperatesasanimportantfactorpromotingyearrounddiazotrophiccyanobacteriabloomsineutrophicreservoirsinthetropics AT lameilei ironoperatesasanimportantfactorpromotingyearrounddiazotrophiccyanobacteriabloomsineutrophicreservoirsinthetropics AT liangpeng ironoperatesasanimportantfactorpromotingyearrounddiazotrophiccyanobacteriabloomsineutrophicreservoirsinthetropics AT qiuqilin ironoperatesasanimportantfactorpromotingyearrounddiazotrophiccyanobacteriabloomsineutrophicreservoirsinthetropics AT luiginaselliflores ironoperatesasanimportantfactorpromotingyearrounddiazotrophiccyanobacteriabloomsineutrophicreservoirsinthetropics
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Iron operates as an important factor promoting year-round diazotrophic cyanobacteria blooms in eutrophic reservoirs in the tropics

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