Variação sazonal do fitoplâncton da região do Saco da Ribeira (Lat. 23º30'S; Long. 45º07'W), Ubatuba, Brasil

Sassi, Roberto; Kutner, M B B

doi:10.1590/s0373-55241982000200005

Cited by 19 publications

(25 citation statements)

References 12 publications

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“…Poor visibility in the water column prevailed during almost all sampling months, except for February, when the water transparency was greater. Whereas no measurements of total suspended matter were done in this study, literature reports for the same study area (Sassi & Kutner ; Aidar et al . ) are consistent with our visual observations of a marked pattern of increasing water turbidity from offshore to inshore and from summer to winter (Table ).…”

Section: Resultsmentioning

confidence: 87%

“…The coastal areas from the Ubatuba region seem to be characterized by three distinct periods: (i) summer; (ii) late summer and (iii) the rest of the year. Key factors influencing biological processes in the water‐column are: subsurface intrusion of SACW in early austral summer (around November–December; Sassi & Kutner ; Aidar et al . ) and the warmer and transparent waters in late summer (around February–March).…”

Section: Discussionmentioning

confidence: 99%

“…; Valdemarsen & Kristensen ) and can be released from the sediment during resuspension events. Accordingly, the lower range of Secchi depths usually documented in August (2–4 m) suggests that physical disturbances related to S winds in Fortaleza can lead to sediment resuspension (Sassi & Kutner ; Aidar et al . ), which in turn may enhance ammonium release to the water column.…”

Section: Discussionmentioning

confidence: 99%

“…C 22 OH, 30∆ 22 and alkenones) and the sterol 29∆ 5 , suggests that a large fraction of this sterol in the sediment is derived primarily from marine rather than terrestrial sources. The year‐round occurrence and abundance of the dinoflagellate Gymnodinium in Ubatuba waters (Sassi & Kutner ) can explain the contribution of 30∆ 22 in sediments. Episodic blooms of phytoflagellates ( e.g .…”

Section: Discussionmentioning

confidence: 99%

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Microbial biomass response to different quantities and sources of organic matter in Brazilian coastal sediments

et al. 2014

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This study investigates the benthic microbial responses to organic matter (OM) variations in quantity and sources in two shallow water bays (Fortaleza and Ubatuba Bays) on the SE coast of Brazil on six occasions during the year. The pelagic and benthic compartments of the bays were evaluated by: (i) nutrients and chlorophyll a (Chl a) in the water column; (ii) quantity and sources of OM in the sediment (Chl a, total organic carbon and total nitrogen and lipid biomarker composition); and (iii) microbial biomass in sediments as an indicator of active benthic response. Although there were changes in water‐column nutrients during the year, Chl a was fairly constant, suggesting a regular supply of microalgae‐derived OM to the sea bottom. Based on the composition of lipid biomarkers in sediments, OM sources were classified as mostly marine and with high contributions of labile (microalgae‐derived) OM. Labile OM composition varied from diatoms in the summer to phytoflagellates in the winter and tended to accumulate in areas protected by physical disturbances in one of the bays. Microbial biomass followed this trend and was 160% higher in protected than in exposed areas. This study suggests that the coupling between labile OM and benthic microbial biomass occurs primarily in protected areas, irrespective of the time of the year. Since meio‐ and macrofaunal assemblages depend upon secondary microbial production within the sediments, this coupling may have an important role for the benthic food‐web.

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Section: Resultsmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Microbial biomass response to different quantities and sources of organic matter in Brazilian coastal sediments

et al. 2014

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“…O objetivo específico do trabalho centrou-se em responder as seguintes hipóteses: (Braga & Muller, 1998). A produtividade primária da região é dominada por espécies do nanoplâncton, mesmo nas épocas de maiores produtividades, quando blooms esporádicos de diatomáceas podem ocorrer (Sassi & Kutner, 1982;Gaeta et al, 1999).…”

Section: Objetivounclassified

Dinâmica bacteriana em sedimentos costeiros de Ubatuba, São Paulo

Moraes¹

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Thin layers in the coastal zone of Ubatuba, Brazil: Mechanisms of formation and dissipation

Penninck

Lopes²,

Lima³

et al. 2020

Limnology & Oceanography

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Thin layers are vertically compressed, horizontally extensive, highly concentrated features comprised of plankton and/or particles. They are critical components of the marine ecosystem, likely playing a key role in the life histories and evolutionary trajectories of species found in, or, interacting with them. These structures have been reported in diverse marine environments around the globe. However, the mechanisms of thin layer formation/dissipation in the southwestern Atlantic Ocean were unknown until this contribution. To assess the temporal evolution of thin phytoplankton layers on the inner shelf off Ubatuba, Brazil, we conducted two oceanographic fixed station cruises, including optics, acoustics, and imaging techniques. Over a period of 2 days, three thin layers were observed: within the pycnocline close to the maximum stratification, and below the pycnocline where phytoplankton were affected by enhanced nutrient supply provided by the South Atlantic Central Water (SACW). Changes in regional wind patterns influenced the presence of SACW, which directly affected shear and stratification: the primary physical mechanisms we attribute to thin layer formation in this region. The associated biological mechanisms contributing to thin layer formation were biomass accumulation (in situ growth) and likely the mobility of dinoflagellates. The dominant organisms in the thin layer depths and surroundings, by our in situ imaging system, were cyanobacteria, diatoms, dinoflagellates, and crustaceans. Thin Layers likely have crucial importance for meso‐oligotrophic environments, representing important feeding resources for higher trophic levels.

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Variação sazonal do fitoplâncton da região do Saco da Ribeira (Lat. 23º30'S; Long. 45º07'W), Ubatuba, Brasil

Cited by 19 publications

References 12 publications

Microbial biomass response to different quantities and sources of organic matter in Brazilian coastal sediments

Microbial biomass response to different quantities and sources of organic matter in Brazilian coastal sediments

Dinâmica bacteriana em sedimentos costeiros de Ubatuba, São Paulo

Thin layers in the coastal zone of Ubatuba, Brazil: Mechanisms of formation and dissipation

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