Annual cycle of picophytoplankton photosynthesis and growth rates in a temperate coastal ecosystem: a major contribution to carbon fluxes

Morán, Xosé Anxelu G.

doi:10.3354/ame01151

Cited by 55 publications

(57 citation statements)

References 45 publications

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“…However, as potential light respiration of fixed carbon by phytoplankton cells could occur, the reported specific rates of CO 2 fixation into cell biomass should be treated as lower or net estimates. The total CO 2 fixation rates reported here ( Figure 4, Table 2) are comparable to previous measurements (for example, see Landry et al, 2000;Pérez et al, 2006;Morán, 2007). Moreover, the large contribution of small phytoplankton (that is, Prochlorococcus, Synechococcus, Euk-A and Euk-B) to CO 2 fixation reported here (Figure 4) is also in agreement with previous size-fractionation studies (for example, see Marañ ón et al, 2001;Pérez et al, 2006).…”

Section: Discussionsupporting

confidence: 82%

“…However, we still have a poor understanding of the phylogenetic affiliation of the smallest cells (for example, see Liu et al, 2010), and particularly in directly linking taxonomic identity with 14 C primary production measurements. In this study, to determine the precise contributions of different phytoplankton groups to CO 2 fixation into biomass in the subtropical and tropical northeast Atlantic Ocean, we used a modified NaH 14 CO 3 radiotracer incubation flow cytometric sorting approach (Li, 1994) on board ship with natural communities sampled in surface waters (between 5 and 20 m) in which the majority of CO 2 fixation is thought to occur (Marañ ó n et al, 2000;Poulton et al, 2006;Morán, 2007). In conjunction with these carbon fixation measurements, the differentiated phytoplankton groups were phylogenetically affiliated using molecular techniques, including fluorescence in situ hybridization (FISH).…”

Section: Introductionmentioning

confidence: 99%

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Significant CO2 fixation by small prymnesiophytes in the subtropical and tropical northeast Atlantic Ocean

et al. 2010

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Global estimates indicate the oceans are responsible for approximately half of the carbon dioxide fixed on Earth. Organisms p5 lm in size dominate open ocean phytoplankton communities in terms of abundance and CO 2 fixation, with the cyanobacterial genera Prochlorococcus and Synechococcus numerically the most abundant and more extensively studied compared with small eukaryotes. However, the contribution of specific taxonomic groups to marine CO 2 fixation is still poorly known. In this study, we show that among the phytoplankton, small eukaryotes contribute significantly to CO 2 fixation (44%) because of their larger cell volume and thereby higher cell-specific CO 2 fixation rates. Within the eukaryotes, two groups, herein called Euk-A and Euk-B, were distinguished based on their flow cytometric signature. Euk-A, the most abundant group, contained cells 1.8±0.1 lm in size while Euk-B was the least abundant but cells were larger (2.8±0.2 lm). The Euk-B group comprising prymnesiophytes (73±13%) belonging largely to lineages with no close cultured counterparts accounted for up to 38% of the total primary production in the subtropical and tropical northeast Atlantic Ocean, suggesting a key role of this group in oceanic CO 2 fixation.

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Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Significant CO2 fixation by small prymnesiophytes in the subtropical and tropical northeast Atlantic Ocean

et al. 2010

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“…While picocyanobacteria have long been recognized as important and typical biological components of oceans and, in general, of oligotrophic ecosystems (Morán, 2007), during the last few years they have been increasingly reported in brackish and eutrophic environments . The reasons for this expansion are largely unknown but may involve physical variables or alterations in nutrients and/or grazers (Sorokin et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

“…The results have served to highlight the increasing importance of these small-sized organisms, which for decades have been recognized as the main primary producers in oceans and oligotrophic aquatic ecosystems (Morán, 2007). However, the important role played by small free-living cyanobacteria in Mediterranean coastal blooms and the ecological damage they induce in areas with high trophic levels have yet to be thoroughly investigated (Sorokin et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

The dominance of cyanobacteria in Mediterranean hypereutrophic lagoons: a case study of Cabras Lagoon (Sardinia, Italy)

Pulina¹,

Padedda²,

Sechi³

et al. 2011

Sci. Mar.

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SUMMARY: An intense proliferation of cyanobacteria in Cabras Lagoon was investigated over a period of two years (July 2007 to June 2009. The influence of environmental and meteorological parameters in the lagoon on temporal variations in cyanobacteria orders was assessed. For 17 months, Chroococcales was the only cyanobacterial order observed in the lagoon. Cyanobium-type cells (Reynolds functional group Z) were the most abundant phytoplankton taxon during this period. In the following months, drastic changes in the cyanobacteria assemblages occurred simultaneously with constant, intense rainfall that led to a sudden drop in the lagoon's salinity. The succession of autumn-winter Oscillatoriales (Planktothrix sp. and Pseudanabaena catenata; Reynolds functional group S1) and late spring growth of Nostocales (Aphanizomenon gracile, Aphanizomenon aphanizomenoides, and Anabaenopsis circularis; Reynolds functional group H1) was monitored. Canonical Correspondence Analysis was carried out to quantify the influence of environmental variables, and indicated strong relationships between Chroococcales and salinity, Oscillatoriales and higher values of SRP and the DIN/SRP ratio, and Nostocales and lower nutrient concentrations, the DIN/SRP ratio and salinity.Keywords: cyanobacteria, phytoplankton, coastal lagoons, eutrophication, Sardinia, Mediterranean Sea. RESUMEN: Dominancia de las cianobacterias en lagunas mediterráneas hipertróficas: el caso de la laguna de Cabras (Cerdeña, Italia). -Durante dos años (julio 2007-junio 2009) se monitoreó una proliferación intensa de cianobacterias en la laguna de Cabras, así como los parámetros ambientales y climáticos que determinaron sus variaciones temporales. Durante 17 meses, Chroococcales fue el único orden de cianobacterias en la laguna, del cual células similares a Cyanobium (grupo funcional Z según Reynolds) fueron las más importantes en cuanto a abundancia. En los meses siguientes, las cianobacterias sufrieron cambios drásticos, que ocurrieron simultáneamente con lluvia constante e intensa que dio lugar a una caída brusca de la salinidad de la laguna. Se monitoreó también la sucesión de Oscillatoriales en otoño-invierno (Planktothrix sp. and Pseudanabaena catenata; grupo funcional S1 según Reynolds) y el crecimiento en primavera de Nostocales (Aphanizomenon gracile, Aphanizomenon aphanizomenoides, y Anabaenopsis circularis; grupo funcional H1 según Reynolds). Análisis de Correspondencia Canónica permitieron cuantificar la influencia de las variables ambientales, indicando una estrecha relación entre Chroococcales y salinidad, Oscillatoriales y altos niveles de SRP y proporción DIN/ SRP, y Nostocales y bajos niveles de nutrientes, proporción DIN/SRP y salinidad.

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“…Finenko et al (2002) studied the different seasons during different years in the Black Sea. One-year studies are available for more sites, such as the Bay of Biscay (Morán 2007, Morán andScharek 2015) and the Tagus estuary (Gameiro et al 2011). Yet the seasonality of the photophysiology parameters in coastal or open oceanic stations has often had to be inferred from sparse samplings in various seasons (e.g.…”

Section: Introductionmentioning

confidence: 99%

Seasonal patterns in phytoplankton photosynthetic parameters and primary production at a coastal NW Mediterranean site

Gasol¹,

Cardelús²,

Morán³

et al. 2016

Sci. Mar.

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Summary:We carried out monthly photosynthesis-irradiance (P-E) experiments with the 14 C-method for 12 years (2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014) to determine the photosynthetic parameters and primary production of surface phytoplankton in the Blanes Bay Microbial Observatory, a coastal sampling station in the NW Mediterranean Sea. Our goal was to obtain seasonal trends and to establish the basis for detecting future changes of primary production in this oligotrophic area. The maximal photosynthetic rate P B max ranged 30-fold (0.5-15 mg C mg Chl a -1 h -1 ), averaged 3.7 mg C mg Chl a -1 h -1 (±0.25 SE) and was highest in August and lowest in April and December. We only observed photoinhibition twice. The initial or light-limited slope of the P-E relationship, α B , was low, averaging 0.007 mg C mg Chl a -1 h -1 (μmol photons m -2 s -1 ) -1 (±0.001 SE, range 0.001-0.045) and showed the lowest values in spring (April-June). The light saturation parameter or saturation irradiance, E K , averaged 711 μmol photons m -2 s -1 (± 58.4 SE) and tended to be higher in spring and lower in winter. Phytoplankton assemblages were typically dominated by picoeukaryotes in early winter, diatoms in late autumn and late winter, dinoflagellates in spring and cyanobacteria in summer. Total particulate primary production averaged 1.45 mg C m -3 h -1 (±0.13 SE) with highest values in winter (up to 8.50 mg C m -3 h -1 ) and lowest values in summer (summer average, 0.30 mg C m -3 h -1 ), while chlorophyllspecific primary production averaged 2.49 mg C mg Chl a -1 h -1 (±0.19, SE) and peaked in summer (up to 12.0 mg C mg Chl a -1 h -1 in August). 14 C-determined phytoplankton growth rates varied between ca. 0.3 d -1 in winter and 0.5 d -1 in summer and were within 60-80% of the maximal rates of growth, based on P B max . Chlorophyll a was a good predictor of primary production only in the winter and autumn. Seasonality appeared to explain most of the variability in the studied variables, while phytoplankton composition played a minor role. Daily integrated primary production was fairly constant throughout the year: similar to previous oxygen-based estimates in winter but considerably lower than these in summer. The difference between 14 C-and oxygen-based estimates of primary production could be explained by community respiration. Annually integrated primary production amounted to a rather modest 48 g C m -2 yr -1 (equivalent to 130 mg C m -2 d -1 ). Although no interannual patterns were detected, our work soundly establishes the seasonal trends for the coastal NW Mediterranean, therefore setting the basis for future detection of change.Keywords: coastal time-series station, primary production, seasonality, photosynthetic parameters, P B max , α B Regularidades estacionales en la producción primaria y los parámetros fotosintéticos en una estación costera del NO MediterráneoResumen: Hemos llevado a cabo mediciones mensuales de la relación entre fotosíntesis e irradiancia (curvas P-E) con el método del 1...

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Annual cycle of picophytoplankton photosynthesis and growth rates in a temperate coastal ecosystem: a major contribution to carbon fluxes

Cited by 55 publications

References 45 publications

Significant CO2 fixation by small prymnesiophytes in the subtropical and tropical northeast Atlantic Ocean

Significant CO2 fixation by small prymnesiophytes in the subtropical and tropical northeast Atlantic Ocean

The dominance of cyanobacteria in Mediterranean hypereutrophic lagoons: a case study of Cabras Lagoon (Sardinia, Italy)

Seasonal patterns in phytoplankton photosynthetic parameters and primary production at a coastal NW Mediterranean site

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