Response of subtropical phytoplankton communities to ocean acidification under oligotrophic conditions and during nutrient fertilization
The subtropical oceans are home to the largest phytoplankton biome on the planet. Yet, little is known about potential impacts of ocean acidification (OA) on phytoplankton community composition in the vast oligotrophic ecosystems of the subtropical gyres. To address this question, we conducted an ex...
Published in: | Frontiers in Marine Science |
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Online Access: | http://hdl.handle.net/10553/51624 https://doi.org/10.3389/fmars.2018.00330 |
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ftunivlaspalmas:oai:accedacris.ulpgc.es:10553/51624 2023-05-15T17:32:56+02:00 Response of subtropical phytoplankton communities to ocean acidification under oligotrophic conditions and during nutrient fertilization Taucher, Jan Arístegui, Javier Bach, Lennart T. Guan, Wanchun Montero, María F. Nauendorf, Alice Achterberg, Eric P. Riebesell, Ulf 36873253700 7006816204 55050031600 24177832900 7102553402 56318475700 7003373116 7004763337 2047459 227201 936505 3995959 29564812 9331861 109726 112772 WOS:Taucher, J WOS:Aristegui, J WOS:Bach, LT WOS:Guan, WC WOS:Montero, MF WOS:Nauendorf, A WOS:Achterberg, EP WOS:Riebesell, U 2018 http://hdl.handle.net/10553/51624 https://doi.org/10.3389/fmars.2018.00330 eng eng Flujos de Carbono en Un Sistema de Afloramiento Costero (Cabo Blanco, Nw de Africa). Papel Del Carbono Disuelto y en Suspension en El Contexto de la Bomba Biologica. Frontiers in Marine Science 5 2296-7745 WoS http://hdl.handle.net/10553/51624 doi:10.3389/fmars.2018.00330 85053721530 000457318100001 330 Sí Frontiers in Marine Science [ISSN 2296-7745], v. 5 (330) 251001 Oceanografía biológica Ocean acidification Phytoplankton Marine ecology Diatoms Oligotrophic oceans Upwelling Canary Islands Subtropical North Atlantic Climate-Change Co2 info:eu-repo/semantics/article Article 2018 ftunivlaspalmas https://doi.org/10.3389/fmars.2018.00330 2021-02-03T00:10:40Z The subtropical oceans are home to the largest phytoplankton biome on the planet. Yet, little is known about potential impacts of ocean acidification (OA) on phytoplankton community composition in the vast oligotrophic ecosystems of the subtropical gyres. To address this question, we conducted an experiment with 9 in situ mesocosms (~35 m3) off the coast of Gran Canaria in the eastern subtropical North Atlantic over a period of 9 weeks. By establishing a gradient of pCO2 ranging from ~350 to 1,025 μatm, we simulated carbonate chemistry conditions as projected until the end of the twenty-first century. Furthermore, we injected nutrient-rich deep water into the mesocosms halfway through the experiment to simulate a natural upwelling event, which regularly leads to patchy nutrient fertilization in the study region. The temporal developments of major taxonomic groups of phytoplankton were analyzed by flow cytometry, pigment composition and microscopy. We observed distinct shifts in phytoplankton community structure in response to high CO2, with markedly different patterns depending on nutrient status of the system. Phytoplankton biomass during the oligotrophic phase was dominated by picocyanobacteria (Synechococcus), which constituted 60–80% of biomass and displayed significantly higher cell abundances at elevated pCO2. The addition of deep water triggered a substantial bloom of large, chain-forming diatoms (mainly Guinardia striata and Leptocylindrus danicus) that dominated the phytoplankton community during the bloom phase (70–80% of biomass) and until the end of the experiment. A CO2 effect on bulk diatom biomass became apparent only in the highest CO2 treatments (>800 μatm), displaying elevated concentrations especially in the stationary phase after nutrient depletion. Notably, these responses were tightly linked to distinct interspecific shifts within the diatom assemblage, particularly favoring the largest species Guinardia striata. Other taxonomic groups contributed less to total phytoplankton biomass, but also displayed distinct responses to OA treatments. For instance, higher CO2 favored the occurrence of prymnesiophyceae (Phaeocystis globosa) and dictyochophyceae, whereas dinoflagellates were negatively affected by increasing CO2. Altogether, our findings revealed considerable shifts in species composition in response to elevated CO2 and/or lower pH, indicating that phytoplankton communities in the subtropical oligotrophic oceans might be profoundly altered by ocean acidification. 14 Article in Journal/Newspaper North Atlantic Ocean acidification Universidad de Las Palmas de Gran Canaria: Acceda Frontiers in Marine Science 5 |
institution |
Open Polar |
collection |
Universidad de Las Palmas de Gran Canaria: Acceda |
op_collection_id |
ftunivlaspalmas |
language |
English |
topic |
251001 Oceanografía biológica Ocean acidification Phytoplankton Marine ecology Diatoms Oligotrophic oceans Upwelling Canary Islands Subtropical North Atlantic Climate-Change Co2 |
spellingShingle |
251001 Oceanografía biológica Ocean acidification Phytoplankton Marine ecology Diatoms Oligotrophic oceans Upwelling Canary Islands Subtropical North Atlantic Climate-Change Co2 Taucher, Jan Arístegui, Javier Bach, Lennart T. Guan, Wanchun Montero, María F. Nauendorf, Alice Achterberg, Eric P. Riebesell, Ulf Response of subtropical phytoplankton communities to ocean acidification under oligotrophic conditions and during nutrient fertilization |
topic_facet |
251001 Oceanografía biológica Ocean acidification Phytoplankton Marine ecology Diatoms Oligotrophic oceans Upwelling Canary Islands Subtropical North Atlantic Climate-Change Co2 |
description |
The subtropical oceans are home to the largest phytoplankton biome on the planet. Yet, little is known about potential impacts of ocean acidification (OA) on phytoplankton community composition in the vast oligotrophic ecosystems of the subtropical gyres. To address this question, we conducted an experiment with 9 in situ mesocosms (~35 m3) off the coast of Gran Canaria in the eastern subtropical North Atlantic over a period of 9 weeks. By establishing a gradient of pCO2 ranging from ~350 to 1,025 μatm, we simulated carbonate chemistry conditions as projected until the end of the twenty-first century. Furthermore, we injected nutrient-rich deep water into the mesocosms halfway through the experiment to simulate a natural upwelling event, which regularly leads to patchy nutrient fertilization in the study region. The temporal developments of major taxonomic groups of phytoplankton were analyzed by flow cytometry, pigment composition and microscopy. We observed distinct shifts in phytoplankton community structure in response to high CO2, with markedly different patterns depending on nutrient status of the system. Phytoplankton biomass during the oligotrophic phase was dominated by picocyanobacteria (Synechococcus), which constituted 60–80% of biomass and displayed significantly higher cell abundances at elevated pCO2. The addition of deep water triggered a substantial bloom of large, chain-forming diatoms (mainly Guinardia striata and Leptocylindrus danicus) that dominated the phytoplankton community during the bloom phase (70–80% of biomass) and until the end of the experiment. A CO2 effect on bulk diatom biomass became apparent only in the highest CO2 treatments (>800 μatm), displaying elevated concentrations especially in the stationary phase after nutrient depletion. Notably, these responses were tightly linked to distinct interspecific shifts within the diatom assemblage, particularly favoring the largest species Guinardia striata. Other taxonomic groups contributed less to total phytoplankton biomass, but also displayed distinct responses to OA treatments. For instance, higher CO2 favored the occurrence of prymnesiophyceae (Phaeocystis globosa) and dictyochophyceae, whereas dinoflagellates were negatively affected by increasing CO2. Altogether, our findings revealed considerable shifts in species composition in response to elevated CO2 and/or lower pH, indicating that phytoplankton communities in the subtropical oligotrophic oceans might be profoundly altered by ocean acidification. 14 |
author2 |
36873253700 7006816204 55050031600 24177832900 7102553402 56318475700 7003373116 7004763337 2047459 227201 936505 3995959 29564812 9331861 109726 112772 WOS:Taucher, J WOS:Aristegui, J WOS:Bach, LT WOS:Guan, WC WOS:Montero, MF WOS:Nauendorf, A WOS:Achterberg, EP WOS:Riebesell, U |
format |
Article in Journal/Newspaper |
author |
Taucher, Jan Arístegui, Javier Bach, Lennart T. Guan, Wanchun Montero, María F. Nauendorf, Alice Achterberg, Eric P. Riebesell, Ulf |
author_facet |
Taucher, Jan Arístegui, Javier Bach, Lennart T. Guan, Wanchun Montero, María F. Nauendorf, Alice Achterberg, Eric P. Riebesell, Ulf |
author_sort |
Taucher, Jan |
title |
Response of subtropical phytoplankton communities to ocean acidification under oligotrophic conditions and during nutrient fertilization |
title_short |
Response of subtropical phytoplankton communities to ocean acidification under oligotrophic conditions and during nutrient fertilization |
title_full |
Response of subtropical phytoplankton communities to ocean acidification under oligotrophic conditions and during nutrient fertilization |
title_fullStr |
Response of subtropical phytoplankton communities to ocean acidification under oligotrophic conditions and during nutrient fertilization |
title_full_unstemmed |
Response of subtropical phytoplankton communities to ocean acidification under oligotrophic conditions and during nutrient fertilization |
title_sort |
response of subtropical phytoplankton communities to ocean acidification under oligotrophic conditions and during nutrient fertilization |
publishDate |
2018 |
url |
http://hdl.handle.net/10553/51624 https://doi.org/10.3389/fmars.2018.00330 |
genre |
North Atlantic Ocean acidification |
genre_facet |
North Atlantic Ocean acidification |
op_source |
Frontiers in Marine Science [ISSN 2296-7745], v. 5 (330) |
op_relation |
Flujos de Carbono en Un Sistema de Afloramiento Costero (Cabo Blanco, Nw de Africa). Papel Del Carbono Disuelto y en Suspension en El Contexto de la Bomba Biologica. Frontiers in Marine Science 5 2296-7745 WoS http://hdl.handle.net/10553/51624 doi:10.3389/fmars.2018.00330 85053721530 000457318100001 330 Sí |
op_doi |
https://doi.org/10.3389/fmars.2018.00330 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
_version_ |
1766131263840714752 |