Phytoplankton community structure in relation to hydrographic features along a coast-to-offshore transect on the SW Atlantic Continental Shelf

Islabão, Carolina Antuarte; Mendes, Carlos; Detoni, Amália Maria Sacilotto; Odebrecht, Clarisse

doi:10.1016/j.csr.2017.10.003

Cited by 14 publications

(6 citation statements)

References 45 publications

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“…In all other stations, the observed nutrients concentration is in line with previous reports in the area that showed similar seasonal patterns (Hazin, 2009;Souza et al, 2013). Likewise, surface nitrogen concentrations, under 1 µmol l -1 , were similar to values reported for other stratified oligotrophic waters (Islabão et al, 2017;Mena et al, 2019). However, compared with other regions it is worth noticing that the N:P ratio of about 3:1, was markedly lower than the ratio observed in the Tropical Eastern Pacific (7-10:1) and in the Mediterranean Sea (5:1) (Mena et al, 2019;Yasunaka et al, 2019).…”

Section: Influence Of Physical Oceanographic Structures On Nutrients ...supporting

confidence: 84%

“…In communities dominated by the low-light adapted ecotypes, higher biomasses near the DCM are likely to be reached, as observed in oligotrophic oceans (Berube et al, 2016;Hawco et al, 2021). These ecotypes display a prochlorophyte chlorophyll-binding protein, which J o u r n a l P r e -p r o o f together with divinyl chlorophyll-b allows low-light adapted ecotypes a higher absorption of the blue light presented in deeper layers (Islabão et al, 2017). Although we did not distinguish ecotypes, Prochlorococcus biomass increased near the DCM, and the known relation with the nitrite primary maximum formation may indicate the dominance of low-light adapted Prochlorococcus in the SWTA phytoplankton community.…”

Section: 2phytoplankton Community Dynamics Associated With Environmen...mentioning

confidence: 90%

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Uncoupled changes in phytoplankton biomass and size structure in the western tropical Atlantic

Farias

Molinero

Carré

et al. 2022

Journal of Marine Systems

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Section: Influence Of Physical Oceanographic Structures On Nutrients ...supporting

confidence: 84%

Section: 2phytoplankton Community Dynamics Associated With Environmen...mentioning

confidence: 90%

Uncoupled changes in phytoplankton biomass and size structure in the western tropical Atlantic

Farias

Molinero

Carré

et al. 2022

Journal of Marine Systems

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“…They reported that cyanobacteria (confirmed by zeaxanthin) account for 20-60% of the phytoplankton community in DIN-limited surface water of the East Sea during spring, consistent with our results. Among cyanobacteria, Synechococcus can survive and adapt to most ocean conditions, but Prochlorococcus is detected only in oligotrophic warm waters [56]. The presence of prochlorophytes, including Prochlorococcus, can be confirmed by the detection of divinyl chl-a.…”

Section: Seasonal Phytoplankton Dynamicsmentioning

confidence: 99%

Characterization of Seasonal Phytoplankton Pigments and Functional Types around Offshore Island in the East/Japan Sea, Based on HPLC Pigment Analysis

et al. 2022

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In this study, we investigated the seasonal phytoplankton community and phytoplankton functional types (PFTs) in the vicinity of Dokdo Island, located in the East/Japan Sea, in 2019. With strong seasonal winds, the water column was well mixed in winter. In spring and autumn, the upper mixed layer depth (MLD) was relatively deep, and the Subsurface Chlorophyll Maximum (SCM) formed in the middle layer. Small phytoplankton were dominant in the summer, which is a time of high water temperatures and strong stratification associated with a shallower MLD. Based on CHEMTAX analysis, in spring, the high phytoplankton biomass was mainly derived from cyanobacteria, diatoms, and dinoflagellates. In summer, >73.2% of the surface biomass was comprised of cyanobacteria. In autumn, pelagophytes accounted for the highest proportion of the biomass. The fraction of microphytoplankton (fmicro) was highest in winter and spring, whereas the fraction of nanophytoplankton (fnano) was highest in autumn and summer. A high fraction of picophytoplankton (fpico) was evident in the surface layers in summer. Values for both the photoprotection index (PI) and the ratio of photoprotective carotenoids (PPC) to photosynthetic carotenoids (PSC) indicate that this study area had high primary productivity in 2019. In order to predict long-term changes in marine food webs due to climate change, it is important to evaluate the size and composition of phytoplankton.

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“…The phytoplanktonic community composition exerts a fundamental role in CO2 uptake via photosynthesis. In the PLE, diatoms are the dominant phytoplankton group, followed by cyanobacteria, flagellates, dinoflagellates, and chlorophytes along the coastal offshore gradient (Islabão et al 2017). Microphytoplanktonic diatoms tend to show a higher capacity for capturing CO2 in water (e.g., Hopkinson et al 2011) than nano-and picoplanktonic species, which helps to balance the carbon concentration.…”

Section: Water-air Co 2 Fluxes and Co 2 Concentrationsmentioning

confidence: 99%

“…The complex balance between freshwater outflow and oceanic inflow leads to large variations in salinity, which significantly affects physical (e.g., Möller et al 2001), chemical (e.g., Niencheski et al 2006;Albuquerque et al under review) and biological properties (e.g., Haraguchi et al 2015). Although the PLE is a well-studied environment in terms of estuarine hydrodynamics (e.g., Möller et al 2001;Möller and Fernandes 2010), biology and physiology of dominant estuarine species, and ecosystem ecology (e.g., Haraguchi et al 2015;Abreu and Odebrecht 2016;Mendes et al 2016;Islabão et al 2017;, very little is known about estuarine carbon biogeochemistry (Albuquerque et al under review). Recently, the first assessment of the estuarine carbonate system in the region indicated that the surface waters in the lower zone of the PLE have natural alkaline conditions, with an average pCO2 of ~380 atm and a supersaturated calcium carbonate environment with respect to both calcite and aragonite (Albuquerque et al under review).…”

Section: Introductionmentioning

confidence: 99%

Water-Air Exchanges In The Lower Estuary Of The Patos Lagoon: Seasonal Variability, Drivers, And Sources Of CO2

Albuquerque

Kerr

Monteiro

et al. 2022

Preprint

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We investigated the primary drivers of changes in the partial pressure of carbon dioxide (pCO2) together with the seasonal and interannual variability in the water-air net carbon dioxide flux (FCO2) in the lower estuarine zone surface waters of Patos Lagoon, the largest choked lagoon worldwide. Sampling occurred monthly during May 2017-June 2021 at the estuary’s inner inlet and mouth, which are contrasting hydrodynamic zones in the Patos Lagoon Estuary (PLE). The water pCO2 was mainly controlled by seasonal changes in total alkalinity and total dissolved inorganic carbon. The lower zone experienced periods of CO2 ingassing (austral summer/autumn) and CO2 outgassing (austral winter/spring). During summer/autumn, both protected and sea-exposed areas uptake an average of –15 mmol m−2 d−1 CO2, whereas during winter/spring, CO2 emissions prevail, reaching an average of 22 mmol m−2 d−1 at the inner estuary. Additionally, while much of the CO2 absorbed in summer/autumn is released to the atmosphere in the inner estuarine zone, the summer/autumn CO2 uptake in the estuary mouth is 4-fold higher than the winter/spring CO2 released. Unlike most estuarine systems, the PLE acted as a net CO2 sink of –2 mmol m−2 d−1 during the period investigated. The balance between CO2 uptake and emissions in the PLE was modulated by the combination of wind speed, freshwater discharge, water temperature, and outflow/inflow currents. Furthermore, phytoplankton blooms and strong wind-induced vertical mixing lead to highly variable CO2 exchanges. The highest estuarine CO2 concentration by autochthonous production indicates heterotrophy in estuarine waters. Part of this carbon produced in the estuary is exported to the coast, as evidenced by the high CO2 concentration in the estuary mouth. Therefore, the lower estuarine zone resists increased CO2 concentrations and has overcome regional anthropogenic emissions. The regional FCO2 range and complex PLE biogeochemistry dynamics need ongoing investigation to improve knowledge of regional CO2 exchanges and elucidate the role of large estuaries and coastal bays in the global carbon budget.

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Phytoplankton community structure in relation to hydrographic features along a coast-to-offshore transect on the SW Atlantic Continental Shelf

Cited by 14 publications

References 45 publications

Uncoupled changes in phytoplankton biomass and size structure in the western tropical Atlantic

Uncoupled changes in phytoplankton biomass and size structure in the western tropical Atlantic

Characterization of Seasonal Phytoplankton Pigments and Functional Types around Offshore Island in the East/Japan Sea, Based on HPLC Pigment Analysis

Water-Air Exchanges In The Lower Estuary Of The Patos Lagoon: Seasonal Variability, Drivers, And Sources Of CO2

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