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dc.contributor.authorTames Espinosa, Maria Teresaen_US
dc.contributor.authorMartínez Sánchez, Icoen_US
dc.contributor.authorRomero Kutzner, Vanesaen_US
dc.contributor.authorCoca Saenz De Albéniz, Josepen_US
dc.contributor.authorAlgueró-Muñiz, Maríaen_US
dc.contributor.authorHorn, Henriette G.en_US
dc.contributor.authorLudwig, Andreaen_US
dc.contributor.authorTaucher, Janen_US
dc.contributor.authorBach, Lennarten_US
dc.contributor.authorRiebesell, Ulfen_US
dc.contributor.authorPackard, Theodore Trainen_US
dc.contributor.authorGómez Cabrera, María Milagrosaen_US
dc.description.abstractIn 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 harmful algal species (HAS), Vicicitus globosus, bloomed in the high pCO2 mesocosms. In these mesocosms, microzooplankton did not proliferate, and chl-a retention time in the water column increased. In these V. globosus-disrupted communities, the Φ/chl-a ratio [4.1 ± 1.5 μL O2 h−1 (μg chl-a)−1] was more similar to the Φ/chl-a ratio in a mixed plankton community than to a photoautotroph-dominated one.en_US
dc.relation.ispartofFrontiers in Marine Scienceen_US
dc.sourceFrontiers in marine science [ISSN 2296-7745], Mayo (2020)en_US
dc.subject251001 Oceanografía biológicaen_US
dc.subject.otherocean acidificationen_US
dc.subject.othernutrient fertilizationen_US
dc.subject.othersubtropical North-Atlanticen_US
dc.subject.otherpotential respirationen_US
dc.subject.otherplankton metabolismen_US
dc.titleMetabolic Responses of Subtropical Microplankton After a Simulated Deep-Water Upwelling Event Suggest a Possible Dominance of Mixotrophy Under Increasing CO2 Levelsen_US
dc.utils.revisionen_US 2020en_US
item.fulltextCon texto completo-
item.grantfulltextopen-ía de Organismos Marinos- de Investigación en Acuicultura Sostenible y Ec- de Biología- de Investigación en Acuicultura Sostenible y Ec- Espinosa, Maria Teresa-ínez Sánchez, Ico- Kutzner, Vanesa- Saenz De Albéniz, Josep-, Theodore Train-ómez Cabrera, María Milagrosa-
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