Phosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic Indian Ocean

Dynamics of picophytoplankton and photosynthesis will be inevitably impacted by changing marine environment, such as ocean acidification and nutrient supply, but related studies are very scarce. Here we cultured the picophytoplankton-dominated surface water of the oligotrophic Eastern Indian Ocean (...

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Autores principales:	Yuqiu Wei, Yuying Zhao, Jiang Gui, Jun Sun
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Picophytoplankton Photosynthesis Ocean acidification Nutrient supply Eastern Indian Ocean Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/6f1ce95e426d4df79d5d95c473ad6320
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spelling	oai:doaj.org-article:6f1ce95e426d4df79d5d95c473ad63202021-12-01T04:46:41ZPhosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic Indian Ocean1470-160X10.1016/j.ecolind.2021.107459https://doaj.org/article/6f1ce95e426d4df79d5d95c473ad63202021-06-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X21001242https://doaj.org/toc/1470-160XDynamics of picophytoplankton and photosynthesis will be inevitably impacted by changing marine environment, such as ocean acidification and nutrient supply, but related studies are very scarce. Here we cultured the picophytoplankton-dominated surface water of the oligotrophic Eastern Indian Ocean (EIO; R/V Shiyan-3, 20 March to 18 May 2019) at two levels of pCO2 (400 and 1000 ppm) and phosphate (0.05 and 1.50 µM) to investigate the interactive effects of elevated pCO2 and phosphate (P) on the dynamics of picophytoplankton and photosynthetic properties. High pCO2 and P levels interactively increased the abundances of Synechococcus, Prochlorococcus and picoeukaryotes by 33%, 18%, and 21%, respectively, of which high P level had a major promoting effect. Conversely, rising pCO2 alone decreased their abundances by 9%, 32%, and 46%, respectively. For the photophysiological responses in relation to the combination of high pCO2 and P levels, there was an increase in the maximum (Fv/Fm) and effective (Fq'/Fm') photochemical efficiency, the electron transfer rates (ETRRCII) and the charge separation rates (JVPSII, an indicator of primary production), but a decrease in the non-photochemical quenching (NPQNSV). Elevated pCO2 alone facilitated the NPQNSV process significantly, ultimately leading to reduced light use efficiency (e.g., Fv/Fm, Fq'/Fm' and ETRRCII) and primary production (JVPSII). There was a strong coupling of picophytoplankton and JVPSII, suggesting the EIO primary productivity was potentially controlled by picophytoplankton. Overall, our results indicate that the negative effects caused by ocean acidification may be masked or outweighted by the role that P availability plays in regulating growth and metabolism in this oligotrophic ecosystem.Yuqiu WeiYuying ZhaoJiang GuiJun SunElsevierarticlePicophytoplanktonPhotosynthesisOcean acidificationNutrient supplyEastern Indian OceanEcologyQH540-549.5ENEcological Indicators, Vol 125, Iss , Pp 107459- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Picophytoplankton Photosynthesis Ocean acidification Nutrient supply Eastern Indian Ocean Ecology QH540-549.5
spellingShingle	Picophytoplankton Photosynthesis Ocean acidification Nutrient supply Eastern Indian Ocean Ecology QH540-549.5 Yuqiu Wei Yuying Zhao Jiang Gui Jun Sun Phosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic Indian Ocean
description	Dynamics of picophytoplankton and photosynthesis will be inevitably impacted by changing marine environment, such as ocean acidification and nutrient supply, but related studies are very scarce. Here we cultured the picophytoplankton-dominated surface water of the oligotrophic Eastern Indian Ocean (EIO; R/V Shiyan-3, 20 March to 18 May 2019) at two levels of pCO2 (400 and 1000 ppm) and phosphate (0.05 and 1.50 µM) to investigate the interactive effects of elevated pCO2 and phosphate (P) on the dynamics of picophytoplankton and photosynthetic properties. High pCO2 and P levels interactively increased the abundances of Synechococcus, Prochlorococcus and picoeukaryotes by 33%, 18%, and 21%, respectively, of which high P level had a major promoting effect. Conversely, rising pCO2 alone decreased their abundances by 9%, 32%, and 46%, respectively. For the photophysiological responses in relation to the combination of high pCO2 and P levels, there was an increase in the maximum (Fv/Fm) and effective (Fq'/Fm') photochemical efficiency, the electron transfer rates (ETRRCII) and the charge separation rates (JVPSII, an indicator of primary production), but a decrease in the non-photochemical quenching (NPQNSV). Elevated pCO2 alone facilitated the NPQNSV process significantly, ultimately leading to reduced light use efficiency (e.g., Fv/Fm, Fq'/Fm' and ETRRCII) and primary production (JVPSII). There was a strong coupling of picophytoplankton and JVPSII, suggesting the EIO primary productivity was potentially controlled by picophytoplankton. Overall, our results indicate that the negative effects caused by ocean acidification may be masked or outweighted by the role that P availability plays in regulating growth and metabolism in this oligotrophic ecosystem.
format	article
author	Yuqiu Wei Yuying Zhao Jiang Gui Jun Sun
author_facet	Yuqiu Wei Yuying Zhao Jiang Gui Jun Sun
author_sort	Yuqiu Wei
title	Phosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic Indian Ocean
title_short	Phosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic Indian Ocean
title_full	Phosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic Indian Ocean
title_fullStr	Phosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic Indian Ocean
title_full_unstemmed	Phosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic Indian Ocean
title_sort	phosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic indian ocean
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/6f1ce95e426d4df79d5d95c473ad6320
work_keys_str_mv	AT yuqiuwei phosphorusenrichmentmaskedthenegativeeffectsofoceanacidificationonpicophytoplanktonandphotosyntheticperformanceintheoligotrophicindianocean AT yuyingzhao phosphorusenrichmentmaskedthenegativeeffectsofoceanacidificationonpicophytoplanktonandphotosyntheticperformanceintheoligotrophicindianocean AT jianggui phosphorusenrichmentmaskedthenegativeeffectsofoceanacidificationonpicophytoplanktonandphotosyntheticperformanceintheoligotrophicindianocean AT junsun phosphorusenrichmentmaskedthenegativeeffectsofoceanacidificationonpicophytoplanktonandphotosyntheticperformanceintheoligotrophicindianocean
_version_	1718405779438960640

Phosphorus enrichment masked the negative effects of ocean acidification on picophytoplankton and photosynthetic performance in the oligotrophic Indian Ocean

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