Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels
In the autumn of 2014, nine large mesocosms were deployed in the oligotrophic subtropical North-Atlantic coastal waters off Gran Canaria (Spain). Their deployment was designed to address the acidification effects of CO2 levels from 400 to 1,400 μatm, on a plankton community experiencing upwelling of...
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2020
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Online Access: | https://doi.org/10.3389/fmars.2020.00307 https://doaj.org/article/9e31e181fa7445b88db6138645a3ebe7 |
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ftdoajarticles:oai:doaj.org/article:9e31e181fa7445b88db6138645a3ebe7 2023-05-15T17:32:57+02:00 Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels Mayte Tames-Espinosa Ico Martínez Vanesa Romero-Kutzner Josep Coca María Algueró-Muñiz Henriette G. Horn Andrea Ludwig Jan Taucher Lennart Bach Ulf Riebesell Theodore T. Packard May Gómez 2020-05-01T00:00:00Z https://doi.org/10.3389/fmars.2020.00307 https://doaj.org/article/9e31e181fa7445b88db6138645a3ebe7 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2020.00307/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.00307 https://doaj.org/article/9e31e181fa7445b88db6138645a3ebe7 Frontiers in Marine Science, Vol 7 (2020) ocean acidification mesocosms nutrient fertilization subtropical North-Atlantic potential respiration plankton metabolism Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2020 ftdoajarticles https://doi.org/10.3389/fmars.2020.00307 2022-12-31T14:46:44Z In the autumn of 2014, nine large mesocosms were deployed in the oligotrophic subtropical North-Atlantic coastal waters off Gran Canaria (Spain). Their deployment was designed to address the acidification effects of CO2 levels from 400 to 1,400 μatm, on a plankton community experiencing upwelling of nutrient-rich deep water. Among other parameters, chlorophyll a (chl-a), potential respiration (Φ), and biomass in terms of particulate protein (B) were measured in the microplankton community (0.7–50.0 μm) during an oligotrophic phase (Phase I), a phytoplankton-bloom phase (Phase II), and a post-bloom phase (Phase III). Here, we explore the use of the Φ/chl-a ratio in monitoring shifts in the microplankton community composition and its metabolism. Φ/chl-a values below 2.5 μL O2 h−1 (μg chl-a)−1 indicated a community dominated by photoautotrophs. When Φ/chl-a ranged higher, between 2.5 and 7.0 μL O2 h−1 (μg chl-a)−1, it indicated a mixed community of phytoplankton, microzooplankton and heterotrophic prokaryotes. When Φ/chl-a rose above 7.0 μL O2 h−1 (μg chl-a)−1, it indicated a community where microzooplankton proliferated (>10.0 μL O2 h−1 (μg chl-a)−1), because heterotrophic dinoflagellates bloomed. The first derivative of B, as a function of time (dB/dt), indicates the rate of protein build-up when positive and the rate of protein loss, when negative. It revealed that the maximum increase in particulate protein (biomass) occurred between 1 and 2 days before the chl-a peak. A day after this peak, the trough revealed the maximum net biomass loss. This analysis did not detect significant changes in particulate protein, neither in Phase I nor in Phase III. Integral analysis of Φ, chl-a and B, over the duration of each phase, for each mesocosm, reflected a positive relationship between Φ and pCO2 during Phase II [α = 230·10−5 μL O2 h−1 L−1 (μatm CO2)−1 (phase-day)−1, R2 = 0.30] and between chl-a and pCO2 during Phase III [α = 100·10−5 μg chl-a L−1 (μ atmCO2)−1 (phase-day)−1, R2 = 0.84]. At the end of Phase II, a ... Article in Journal/Newspaper North Atlantic Ocean acidification Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 7 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ocean acidification mesocosms nutrient fertilization subtropical North-Atlantic potential respiration plankton metabolism Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
ocean acidification mesocosms nutrient fertilization subtropical North-Atlantic potential respiration plankton metabolism Science Q General. Including nature conservation geographical distribution QH1-199.5 Mayte Tames-Espinosa Ico Martínez Vanesa Romero-Kutzner Josep Coca María Algueró-Muñiz Henriette G. Horn Andrea Ludwig Jan Taucher Lennart Bach Ulf Riebesell Theodore T. Packard May Gómez Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels |
topic_facet |
ocean acidification mesocosms nutrient fertilization subtropical North-Atlantic potential respiration plankton metabolism Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
In the autumn of 2014, nine large mesocosms were deployed in the oligotrophic subtropical North-Atlantic coastal waters off Gran Canaria (Spain). Their deployment was designed to address the acidification effects of CO2 levels from 400 to 1,400 μatm, on a plankton community experiencing upwelling of nutrient-rich deep water. Among other parameters, chlorophyll a (chl-a), potential respiration (Φ), and biomass in terms of particulate protein (B) were measured in the microplankton community (0.7–50.0 μm) during an oligotrophic phase (Phase I), a phytoplankton-bloom phase (Phase II), and a post-bloom phase (Phase III). Here, we explore the use of the Φ/chl-a ratio in monitoring shifts in the microplankton community composition and its metabolism. Φ/chl-a values below 2.5 μL O2 h−1 (μg chl-a)−1 indicated a community dominated by photoautotrophs. When Φ/chl-a ranged higher, between 2.5 and 7.0 μL O2 h−1 (μg chl-a)−1, it indicated a mixed community of phytoplankton, microzooplankton and heterotrophic prokaryotes. When Φ/chl-a rose above 7.0 μL O2 h−1 (μg chl-a)−1, it indicated a community where microzooplankton proliferated (>10.0 μL O2 h−1 (μg chl-a)−1), because heterotrophic dinoflagellates bloomed. The first derivative of B, as a function of time (dB/dt), indicates the rate of protein build-up when positive and the rate of protein loss, when negative. It revealed that the maximum increase in particulate protein (biomass) occurred between 1 and 2 days before the chl-a peak. A day after this peak, the trough revealed the maximum net biomass loss. This analysis did not detect significant changes in particulate protein, neither in Phase I nor in Phase III. Integral analysis of Φ, chl-a and B, over the duration of each phase, for each mesocosm, reflected a positive relationship between Φ and pCO2 during Phase II [α = 230·10−5 μL O2 h−1 L−1 (μatm CO2)−1 (phase-day)−1, R2 = 0.30] and between chl-a and pCO2 during Phase III [α = 100·10−5 μg chl-a L−1 (μ atmCO2)−1 (phase-day)−1, R2 = 0.84]. At the end of Phase II, a ... |
format |
Article in Journal/Newspaper |
author |
Mayte Tames-Espinosa Ico Martínez Vanesa Romero-Kutzner Josep Coca María Algueró-Muñiz Henriette G. Horn Andrea Ludwig Jan Taucher Lennart Bach Ulf Riebesell Theodore T. Packard May Gómez |
author_facet |
Mayte Tames-Espinosa Ico Martínez Vanesa Romero-Kutzner Josep Coca María Algueró-Muñiz Henriette G. Horn Andrea Ludwig Jan Taucher Lennart Bach Ulf Riebesell Theodore T. Packard May Gómez |
author_sort |
Mayte Tames-Espinosa |
title |
Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels |
title_short |
Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels |
title_full |
Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels |
title_fullStr |
Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels |
title_full_unstemmed |
Metabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levels |
title_sort |
metabolic responses of subtropical microplankton after a simulated deep-water upwelling event suggest a possible dominance of mixotrophy under increasing co2 levels |
publisher |
Frontiers Media S.A. |
publishDate |
2020 |
url |
https://doi.org/10.3389/fmars.2020.00307 https://doaj.org/article/9e31e181fa7445b88db6138645a3ebe7 |
genre |
North Atlantic Ocean acidification |
genre_facet |
North Atlantic Ocean acidification |
op_source |
Frontiers in Marine Science, Vol 7 (2020) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2020.00307/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2020.00307 https://doaj.org/article/9e31e181fa7445b88db6138645a3ebe7 |
op_doi |
https://doi.org/10.3389/fmars.2020.00307 |
container_title |
Frontiers in Marine Science |
container_volume |
7 |
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1766131282694111232 |