Nutrient availability modulates the effects of climate change on growth and photosynthesis of marine macroalga Pyropia h
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Nutrient availability modulates the effects of climate change on growth and photosynthesis of marine macroalga Pyropia haitanensis (Bangiales, Rhodophyta) Chunxiang Liu 1,2 & Dinghui Zou 2,3 & Yahe Li 4 Received: 15 January 2020 / Revised and accepted: 17 June 2020 # Springer Nature B.V. 2020
Abstract The present research investigated the effect of pCO2 levels (C), seawater temperature (T), and nutrient availability (N) on the growth and physiochemical changes in Pyropia haitanensis. With nutrient enrichment, the interaction of higher pCO2 increased relative growth rates (RGR) by 105.9% when temperature increased (22 °C) compared with the control (lower T, lower C, and lower N: LTLCLN). The higher pCO2 decreased the Pm rates at the lower temperature (18 °C), yet displayed no interaction with higher T or N levels. The higher N increased dark respiration rate (Rd) at 18 °C. At 22 °C, higher pCO2 significantly enhanced the maximum ratio of (quantum yields (Fv/Fo) and the maximum quantum yield (ψpo), while it sharply decreased the absorption of photons per active reaction center (ABS/RC) and dissipation of energy fluxes (per RC) (DIo/RC). Higher temperature obviously reduced the Fv/Fo and ψpo under ambient CO2 level. The higher pCO2 significantly increased the phycoerythrin (PE) and phycocyanin (PC) contents, while higher temperature decreased the PE contents with elevated CO2 and declined the PC content regardless of CO2 condition. At lower nutrient condition, higher pCO2 increased Chl a content. Soluble carbohydrates (SC) and soluble protein (SP) content almost was unchanged among all treatments. Our findings indicate that nutrient availability may regulate photosynthetic mechanism to offset the negative effect of future ocean warming on P. haitanensis, thereby sustaining or increasing the biomass yield of the algae. Keywords Pyropia haitanensis . Climate change . Nutrient . Growth . Photosynthesis
Introduction Marine macroalgae, which are essential components of coastal ecosystems around the world, are currently threatened by a multitude of stressors. Those stressors include higher
* Dinghui Zou [email protected] 1
Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Huaibei Normal University, Huaibei 235000, China
2
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China
3
Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou 510006, China
4
Zhejiang Provincial Key Laboratory of Marine Biotechnology, Key Laboratory of Applied Marine Biotechnology of Department of Education, School of Marine Sciences, Ningbo University, Ningbo 315211, China
atmospheric CO2 and seawater temperature (which are related to global climate change) (Harley et al. 2012), increasing nutrient and sediment loading, and so on (Worm and Lotze 2006). It is predicted that the atmospheric CO2 concentration will continue to rise throughout this century (Bernstein et al. 2008), and
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