Warming and CO2 effects under oligotrophication on temperate phytoplankton communities

WATER RESEARCH

卷:173

Article

Cabrerizo, Marco J.^1,5,6  Inmaculada Alvarez-Manzaneda, M.²  Leon-Palmero, Elizabeth²  Guerrero-Jimenez, Gerardo²  de Senerpont Domis, Lisette N.^3,4  Teurlincx, Sven³  Gonzalez-Olalla, Juan M.¹ 

[1] Univ Granada, Fac Sci, Dept Ecol, Campus Fuentenueva S-N, E-18071 Granada, Spain

[2] Univ Granada, Universitary Inst Water Res, PO 4, E-18071 Granada, Spain

[3] Netherlands Inst Ecol NIOO KNAW, Droevendaalsesteeg 10, NL-6708 PB Wageningen, Netherlands

[4] Wageningen Univ, Aquat Ecol & Water Qual Management Grp, Wageningen, Netherlands

[5] Univ Vigo, CIM UVigo, Ctr Invest Marina, Illa de Toralla S-N, Vigo 36331, Spain

[6] Univ Vigo, Fac Marine Sci, Dept Ecol & Anim Biol, Campus Lagoas Marcosende, Vigo 36310, Spain

关键词: Eukaryotes;    Global change;    Photosynthesis;    Cyanobacteria;    Resource use efficiency;    Shallow lakes;   

DOI  :  10.1016/j.watres.2020.115579

来源: Elsevier

【 摘 要 】

Eutrophication, global warming, and rising carbon dioxide (CO2) levels are the three most prevalent pressures impacting the biosphere. Despite their individual effects are well-known, it remains untested how oligotrophication (i.e. nutrients reduction) can alter the planktonic community responses to warming and elevated CO2 levels. Here, we performed an indoor mesocosm experiment to investigate the warming x CO2 interaction under a nutrient reduction scenario (40%) mediated by an in-lake management strategy (i.e. addition of a commercial solid-phase phosphorus sorbent -Phoslock (R)) on a natural freshwater plankton community. Biomass production increased under warming x CO2 relative to present-day conditions; however, a Phoslock (R)-mediated oligotrophication reduced such values by 30-70%. Conversely, the warming x CO2 x oligotrophication interaction stimulated the photosynthesis by 20% compared to ambient nutrient conditions, and matched with higher resource use efficiency (RUE) and nutrient demand. Surprisingly, at a group level, we found that the multi-stressors scenario increased the photosynthesis in eukaryotes by 25%, but greatly impaired in cyanobacteria (ca. -25%). This higher cyanobacterial sensitivity was coupled with a reduced light harvesting efficiency and compensation point. Since Phoslock (R)-induced oligotrophication unmasked a strong negative warming x CO2 effect on cyanobacteria, it becomes crucial to understand how the interplay between climate change and nutrient abatement actions may alter the, ecosystems functioning. With an integrative understanding of these processes, policy makers will design more appropriate management strategies to improve the ecological status of aquatic ecosystems without compromising their ecological attributes and functioning. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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