Effects of Elevated CO2 on a Natural Diatom Community in the Subtropical NE Atlantic
Diatoms are silicifying phytoplankton contributing about one quarter to primary production on Earth. Ocean acidification (OA) could alter the competitiveness of diatoms relative to other taxa and/or lead to shifts among diatom species. In spring 2016, we set up a plankton community experiment at the...
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ftdoajarticles:oai:doaj.org/article:74f56ae047bc4190ac2a602ff1a40988 2023-05-15T17:50:43+02:00 Effects of Elevated CO2 on a Natural Diatom Community in the Subtropical NE Atlantic Lennart T. Bach Nauzet Hernández-Hernández Jan Taucher Carsten Spisla Claudia Sforna Ulf Riebesell Javier Arístegui 2019-03-01T00:00:00Z https://doi.org/10.3389/fmars.2019.00075 https://doaj.org/article/74f56ae047bc4190ac2a602ff1a40988 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2019.00075/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2019.00075 https://doaj.org/article/74f56ae047bc4190ac2a602ff1a40988 Frontiers in Marine Science, Vol 6 (2019) ocean acidification climate change mesocosm food web phytoplankton Bacillariophyceae Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2019 ftdoajarticles https://doi.org/10.3389/fmars.2019.00075 2022-12-30T22:31:10Z Diatoms are silicifying phytoplankton contributing about one quarter to primary production on Earth. Ocean acidification (OA) could alter the competitiveness of diatoms relative to other taxa and/or lead to shifts among diatom species. In spring 2016, we set up a plankton community experiment at the coast of Gran Canaria (Canary Islands, Spain) to investigate the response of subtropical diatom assemblages to elevated seawater pCO2. Therefore, natural plankton communities were enclosed for 32 days in in situ mesocosms (∼8 m3 volume) with a pCO2 gradient ranging from 380 to 1140 μatm. Halfway through the study we added nutrients to all mesocosms (N, P, Si) to simulate injections through eddy-induced upwelling which frequently occurs in the region. We found that the total diatom biomass remained unaffected during oligotrophic conditions but was significantly positively affected by high CO2 after nutrient enrichment. The average cell volume and carbon content of the diatom community increased with CO2. CO2 effects on diatom biomass and species composition were weak during oligotrophic conditions but became quite strong above ∼620 μatm after the nutrient enrichment. We hypothesize that the proliferation of diatoms under high CO2 may have been caused by a fertilization effect on photosynthesis in combination with reduced grazing pressure. Our results suggest that OA in the subtropics may strengthen the competitiveness of (large) diatoms and cause changes in diatom community composition, mostly under conditions when nutrients are injected into oligotrophic systems. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 6 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ocean acidification climate change mesocosm food web phytoplankton Bacillariophyceae Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
ocean acidification climate change mesocosm food web phytoplankton Bacillariophyceae Science Q General. Including nature conservation geographical distribution QH1-199.5 Lennart T. Bach Nauzet Hernández-Hernández Jan Taucher Carsten Spisla Claudia Sforna Ulf Riebesell Javier Arístegui Effects of Elevated CO2 on a Natural Diatom Community in the Subtropical NE Atlantic |
topic_facet |
ocean acidification climate change mesocosm food web phytoplankton Bacillariophyceae Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Diatoms are silicifying phytoplankton contributing about one quarter to primary production on Earth. Ocean acidification (OA) could alter the competitiveness of diatoms relative to other taxa and/or lead to shifts among diatom species. In spring 2016, we set up a plankton community experiment at the coast of Gran Canaria (Canary Islands, Spain) to investigate the response of subtropical diatom assemblages to elevated seawater pCO2. Therefore, natural plankton communities were enclosed for 32 days in in situ mesocosms (∼8 m3 volume) with a pCO2 gradient ranging from 380 to 1140 μatm. Halfway through the study we added nutrients to all mesocosms (N, P, Si) to simulate injections through eddy-induced upwelling which frequently occurs in the region. We found that the total diatom biomass remained unaffected during oligotrophic conditions but was significantly positively affected by high CO2 after nutrient enrichment. The average cell volume and carbon content of the diatom community increased with CO2. CO2 effects on diatom biomass and species composition were weak during oligotrophic conditions but became quite strong above ∼620 μatm after the nutrient enrichment. We hypothesize that the proliferation of diatoms under high CO2 may have been caused by a fertilization effect on photosynthesis in combination with reduced grazing pressure. Our results suggest that OA in the subtropics may strengthen the competitiveness of (large) diatoms and cause changes in diatom community composition, mostly under conditions when nutrients are injected into oligotrophic systems. |
format |
Article in Journal/Newspaper |
author |
Lennart T. Bach Nauzet Hernández-Hernández Jan Taucher Carsten Spisla Claudia Sforna Ulf Riebesell Javier Arístegui |
author_facet |
Lennart T. Bach Nauzet Hernández-Hernández Jan Taucher Carsten Spisla Claudia Sforna Ulf Riebesell Javier Arístegui |
author_sort |
Lennart T. Bach |
title |
Effects of Elevated CO2 on a Natural Diatom Community in the Subtropical NE Atlantic |
title_short |
Effects of Elevated CO2 on a Natural Diatom Community in the Subtropical NE Atlantic |
title_full |
Effects of Elevated CO2 on a Natural Diatom Community in the Subtropical NE Atlantic |
title_fullStr |
Effects of Elevated CO2 on a Natural Diatom Community in the Subtropical NE Atlantic |
title_full_unstemmed |
Effects of Elevated CO2 on a Natural Diatom Community in the Subtropical NE Atlantic |
title_sort |
effects of elevated co2 on a natural diatom community in the subtropical ne atlantic |
publisher |
Frontiers Media S.A. |
publishDate |
2019 |
url |
https://doi.org/10.3389/fmars.2019.00075 https://doaj.org/article/74f56ae047bc4190ac2a602ff1a40988 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Frontiers in Marine Science, Vol 6 (2019) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2019.00075/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2019.00075 https://doaj.org/article/74f56ae047bc4190ac2a602ff1a40988 |
op_doi |
https://doi.org/10.3389/fmars.2019.00075 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
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1766157591279304704 |