Phyto- and protozooplankton assemblages and hydrographic variability during an early winter survey in the Southern Brazilian Continental Shelf

Gonçalves-Araujo, Rafael; Souza, Márcio Silva de; Tavano, Virgínia Maria; Mendes, Carlos; Souza, Ronald Buss de; Schultz, Cristina; Pollery, Ricardo

doi:10.1016/j.jmarsys.2018.04.005

Cited by 11 publications

(9 citation statements)

References 47 publications

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“…Along with that, we also present new insights into the absorption budget and distribution of CDOM and particles in the sampled area. CDOM was significantly correlated to Chl-a suggesting the presence of an autochthonous source of CDOM to the region driven mostly by the phytoplankton community over the shelf domain, generally composed by diatoms (Brandini et al, 2007(Brandini et al, , 2014Bergo et al, 2017;Gonçalves-Araujo et al, 2018a). DOC, on the other hand, was not correlated with salinity and presented high values within the TW, suggesting an input other than the continental runoff within those waters.…”

Section: Discussionmentioning

confidence: 93%

“…The SBB is a hydrographically dynamic environment with strong seasonality and the presence of mesoscale features as meanders and eddies (Castro, 2014). It sustains a diverse planktonic community encompassing a wide range of autoand heterotrophic organisms from picophytoplankton to microzooplankton (Brandini, 1990;Brandini et al, 2014;Detoni et al, 2016;Bergo et al, 2017;Gonçalves-Araujo et al, 2018a). During the Austral summer expedition CARBOM-3, we analyzed the hydrographic conditions and the OACs along a cross-shelf transect in the poorly sampled SBB.…”

Section: Discussionmentioning

confidence: 99%

“…Beneath the surface layer, the entire water column is characterized by the presence of the South Atlantic Central Water (SACW) (Castro, 2014). High phytoplankton biomass with great contribution of micro-planktonic organisms is observed in the inner-shelf, fueled by the nutrient input from continental runoff, whereas small organisms dominate within the oligotrophic TW (Brandini et al, 2007;Bergo et al, 2017;Gonçalves-Araujo et al, 2018a). During summer time, with the intense action of NE winds coupled to the Ekman transport, the shelf waters are pushed offshore, allowing for the intrusion of nutrient-rich SACW within the entire continental shelf (Castro, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Hydrography-Driven Variability of Optically Active Constituents of Water in the South Brazilian Bight: Biogeochemical Implications

et al. 2019

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The South Brazilian Bight (SBB) is a hydrographically dynamic environment with strong seasonality that sustains a diverse planktonic community involved in diverse biogeochemical processes. The inherent optical properties (IOPs; e.g., absorption and scattering coefficients) of optically actives constituents of water (OACs; phytoplankton, non-algal particles-NAP, and colored dissolved organic matter-CDOM) have been widely employed to retrieve information on biogeochemical parameters in the water. In this study conducted in the SBB, a cross-shelf transect was performed for biogeochemistry and hydrographic sampling during a summer expedition. Our research aimed to determine the distribution and amount of the OACs based on their spectral signature, in relation to the distribution of water masses in the region. That allows us to get insights into the biogeochemical processes within each water mass and in the boundaries between them. We observed a strong intrusion of South Atlantic Central Water (SACW) over the shelf, mainly driven by the wind action. With that, phytoplankton development was fueled by the input of nutrients, and increased chlorophyll-a (Chl-a) concentrations were observed within the shallowest stations. Colored dissolved organic matter did not follow the distribution of dissolved organic carbon (DOC). Both CDOM and DOC presented high values at the low salinity Coastal Water (CW), as an indication of the continental influence over the shelf. However, CDOM was inversely correlated with salinity and lowest values were observed within Tropical Water (TW), whereas DOC values within TW were as high as within CW, indicating an autochthonous DOM source. Additionally, a deep Chl-a maximum (DCM) was noticed in the boundary between the TW and SACW. Along with the DCM, we observed the production of fresh, non-colored DOM attributed to the microbial community. Finally, our results suggest that CDOM is photodegraded at the surface of CW. This is mainly due to the Ekman transport effect over the region that traps CW at the surface, making it longer exposed to solar radiation.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrography-Driven Variability of Optically Active Constituents of Water in the South Brazilian Bight: Biogeochemical Implications

et al. 2019

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“…The southern region SST is influenced by the fresh waters of the La Plata River (A) plume. During austral spring and summer, the river plume flows northeastward to about 32°S where it broadens offshore, whilst in autumn and winter the plume flows further along‐shelf beyond 28°S (Piola et al., 2000) with colder and low‐salinity signature reaching far north as the southern SBB (de Souza & Robinson, 2004; Gonçalves‐Araujo et al., 2018; Mendonça et al., 2017). These seasonal variations are primarily controlled by the along‐shore wind stress.…”

Section: Space‐time Diagrams and The Seasonal Cyclementioning

confidence: 99%

“…The seasonality is notable but more remarkable is how distant some of the CHL signals can be observed farther downstream or even upstream from some of those rivers. From the La Plata River (A), CHL's annual maximum occurs in the fall months and that signal can be followed up to Cabo de Santa Marta (B) and for some years, up to Cabo Frio (C) as the La Plata Plume (Gonçalves‐Araujo et al., 2018). The Amazon River (G) exports CHL downstream but there is an annual contribution to that coming almost 2000 km from the south.…”

Section: Space‐time Diagrams and The Seasonal Cyclementioning

confidence: 99%

Evolution of Physical and Biological Patterns Along the Tropical and South Atlantic Western Boundary: A Satellite Perspective

et al. 2022

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We investigate the spatial and temporal patterns of satellite‐derived sea surface temperature, salinity and chlorophyll‐a concentration along the eastern South American coast. Two decade‐long time series (2002–2019; except for the salinity) allowed us to investigate changes from seasonal to interannual time scales on an array that stretches from the south (42°S) to the north (10°N) of the continent and from isobaths ranging from −50 to −1000 m away from the coast. The novelty of our approach is to assess comparatively the magnitude, variability, and spectrum of these variables following the same isobaths and using the same methodology. This allowed us to examine the influence of large scale ocean circulation patterns entangled with the local forcing systems such as river discharge and coastal currents, and to quantify to what extent these patterns are spatially and temporally consistent. The seasonal cycle of the temperature explains more variance than that of salinity and chlorophyll on average. Comparatively, salinity has a weak seasonal signal, except near major rivers. Significant long‐term trends were observed in specific regions in the salinity time series. Our study revealed distinct interannual changes at 2‐ and 4‐year period in the whole array with the largest spectral peaks near the La Plata and the Amazon Rivers. Within this period band, thermal signals propagate northward along the whole array. Statistical correlations between satellite‐derived variables and several climate indices suggest remote forcing.

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Stranding of Marine Animals: Effects of Environmental Variables

Brusius¹,

Souza²,

Barbieri³

2020

Encyclopedia of the UN Sustainable Development Goals

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Stranded is the term used to refer to a marine animal found on land that does not have the ability to return to the sea (Branco et al. 2015). Stranded marine animals are often observed on beaches around the world, and the reasons for this are varied, ranging from anthropic and fishery interaction to disease, marine pollution, and even due to the occurrence of storms (Barbieri 2009a, b). There are studies that attempt to investigate which are the factors more determinants for the marine animals that end up dead on the beaches. The stranding monitoring is a useful tool to know and learn more about the species and their relationship with the environment. Meteorological and oceanographic phenomena can generate intense winds and wave heights above normal, intensify marine currents, and cause the heating or cooling of sea surface temperatures (Tavares et al. 2016; Melo 2017). These events may affect the survival of a species due to exhaustion, which influences the displacement of individuals and their search for food, as well as the arrival of these animals on the beaches by drifting carcasses (Barbieri et al. 2007). The study of these stranded animals may provide the necessary knowledge to direct conservation efforts and provide data for assessing the mortality rate of taxonomic groups, causes of death, seasonality of events, and associations with oceanographic, meteorological, and anthropogenic variables.

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Phyto- and protozooplankton assemblages and hydrographic variability during an early winter survey in the Southern Brazilian Continental Shelf

Cited by 11 publications

References 47 publications

Hydrography-Driven Variability of Optically Active Constituents of Water in the South Brazilian Bight: Biogeochemical Implications

Hydrography-Driven Variability of Optically Active Constituents of Water in the South Brazilian Bight: Biogeochemical Implications

Evolution of Physical and Biological Patterns Along the Tropical and South Atlantic Western Boundary: A Satellite Perspective

Stranding of Marine Animals: Effects of Environmental Variables

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