Seasonal dynamics of picoplankton in shelf waters of the southern Bay of Biscay

Calvo‐Díaz, Alejandra; Morán, Xosé Anxelu G.

doi:10.3354/ame042159

Cited by 176 publications

(179 citation statements)

References 59 publications

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“…In the cyanobacteria, growth is promoted at higher temperatures (Shiah & Ducklow 1994, Moore et al 1995, and active division of cells could increase the population size, potentially decreasing mean cell volumes. A decrease in the cell volume of cyanobacteria in summer when abundance increases has also been found in Blanes Bay (Mediterrnanean Sea) (Agawin et al 1998) and in the central Cantabrian Sea, Spain (Calvo-Díaz & Morán 2006). This may also occur in bacteria.…”

Section: Environmental Factors Influencing Seasonal Variations In Celmentioning

confidence: 91%

“…However, we did not find any significant correlation between bacterial mean cell volumes and temperature (Table 1). Discernable seasonal patterns in cell volume of bacteria were not recognized in the cenral Cantabrian Sea (Calvo-Díaz & Morán 2006). Temperature is an important factor directly affecting bacterial physiological responses, but the degree and the range of its effect probably vary with bacterial species.…”

Section: Environmental Factors Influencing Seasonal Variations In Celmentioning

confidence: 99%

“…The maximum cell densities at coastal sites in the North Atlantic and Pacific Oceans also fall within this limited range (Worden et al 2004, Calvo-Díaz & Morán 2006. However, cyanobacterial abundances higher by one order of magnitude have been reported in coastal waters in the northern Baltic Sea and near Florida (Kuosa 1991, Murrel & Lores 2004.…”

mentioning

confidence: 99%

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Seasonal variations in abundance and biomass of picoplankton in an oyster-farming area of northern Japan

Kamiyama

Iwai²,

Hamasaki

2009

Plankton Benthos Res

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Section: Environmental Factors Influencing Seasonal Variations In Celmentioning

confidence: 91%

Section: Environmental Factors Influencing Seasonal Variations In Celmentioning

confidence: 99%

See 1 more Smart Citation

Seasonal variations in abundance and biomass of picoplankton in an oyster-farming area of northern Japan

Kamiyama

Iwai²,

Hamasaki

2009

Plankton Benthos Res

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“…Autotrophic cells were separated into 2 groups of cyanobacteria (Synechococcus and Prochlorococcus) and 2 groups of picoeukaryotes (small and large), based on their orange (FL2, 585 nm) and red (FL3, >650 nm) fluorescence and side-scattered light (SSC) (Calvo-Díaz and Morán, 2006). Two groups of heterotrophic bacteria, with high and low nucleic acid content (HNA and LNA, respectively), were distinguished based on their relative green fluorescence (FL1, 530 nm), which was used as a proxy for nucleic acid content.…”

Section: Flow Cytometric Countingmentioning

confidence: 99%

Biological N2 Fixation in the Upwelling Region off NW Iberia: Magnitude, Relevance, and Players

et al. 2017

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The classical paradigm about marine N 2 fixation establishes that this process is mainly constrained to nitrogen-poor tropical and subtropical regions, and sustained by the colonial cyanobacterium Trichodesmium spp. and diatom-diazotroph symbiosis. However, the application of molecular techniques allowed determining a high phylogenic diversity and wide distribution of marine diazotrophs, which extends the range of ocean environments where biological N 2 fixation may be relevant. Between February 2014 and December 2015, we carried out 10 one-day samplings in the upwelling system off NW Iberia in order to: (1) investigate the seasonal variability in the magnitude of N 2 fixation, (2) determine its biogeochemical role as a mechanism of new nitrogen supply, and (3) quantify the main diazotrophs in the region under contrasting hydrographic regimes. Our results indicate that the magnitude of N 2 fixation in this region was relatively low (0.001 ± 0.002 -0.095 ± 0.024 µmol N m −3 d −1 ), comparable to the lower-end of rates described for the subtropical NE Atlantic. Maximum rates were observed at the surface during both upwelling and relaxation conditions. The comparison with nitrate diffusive fluxes revealed the minor role of N 2 fixation (<2%) as a mechanism of new nitrogen supply into the euphotic layer. Small diazotrophs (<10 µm) were responsible for all N 2 fixation activity detected in the region. Quantitative PCR targeting the nifH gene revealed the highest abundances of two sublineages of Candidatus Atelocyanobacterium thalassa or UCYN-A (UCYN-A1 and UCYN-A2), mainly at surface waters during upwelling and relaxation conditions, and of Gammaproteobacteria γ-24774A11 at deep waters during downwelling. Maximum abundance for the three groups were up to 6.7 × 10 2 , 1.5 × 10 3 , and 2.4 × 10 4 nifH copies L −1 , respectively. Our findings demonstrate measurable N 2 fixation activity and presence of diazotrophs throughout the year in a nitrogen-rich temperate region.

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“…The distribution of Prochlorococcus is controlled by various factors, including physical forces (temperature, salinity, and light) caused by upwelling, a mesoscale eddy, and fronts, which are frequent in the open ocean, as well as chemical factors, such as nutrient concentrations. Despite the lack of information on the mechanisms underlying the dynamics of picophytoplankton communities in the continental shelf waters (Mackey et al 2009, Calvo-Diaz and Moran 2006, Calvo-Diaz et al 2008, the variability of hydrodynamics may identify the variability and relative importance of the environmental factors affecting the picophytoplankton distribution in these ecosystems (Jiao et al 2002).…”

Section: Picophytoplanktonmentioning

confidence: 99%

Effects of coastal upwelling on picophytoplankton distribution off the coast of Zhanjiang in South China Sea

Wang

et al. 2014

Oceanological and Hydrobiological Studies

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Coastal upwelling occurred along the west coast of Guangdong in the northern South China Sea during the summer of 2006. The effects of upwelling on the vertical and horizontal distributions of Prochlorococcus and Synechococcus were investigated. A distinct vertical temperature difference between the surface water and water at a depth of 30 m was observed in the coastal upwelling region. There was a clear spatial variability of temperature, and an increasingly obvious horizontal gradient was created from the coast to offshore waters. Picophytoplankton communities observed from the coast to offshore waters were significantly different. In the coastal upwelling waters, the picophytoplankton community was dominated by Synechococcus within the euphotic zone. Prochlorococcus dominated the * Corresponding author: dongjd@scsio.ac.cn picophytoplankton community in the euphotic zone in the nonupwelling region. This difference in the picophytoplankton community structure was due to different hydrodynamics. The results of canonical correspondence analysis demonstrate that temperature, salinity, and phosphate concentration may be important factors affecting the distribution of Prochlorococcus and Synechococcus.

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Seasonal dynamics of picoplankton in shelf waters of the southern Bay of Biscay

Cited by 176 publications

References 59 publications

Seasonal variations in abundance and biomass of picoplankton in an oyster-farming area of northern Japan

Seasonal variations in abundance and biomass of picoplankton in an oyster-farming area of northern Japan

Biological N2 Fixation in the Upwelling Region off NW Iberia: Magnitude, Relevance, and Players

Effects of coastal upwelling on picophytoplankton distribution off the coast of Zhanjiang in South China Sea

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