Numerical contribution of phytoplanktonic cells, heterotrophic particles and bacteria to size fractionated POC in the Cananéia estuary (25ºS 48ºW), Brazil

Mesquita, Hilda de Souza Lima; Peres, C.

doi:10.1590/s0373-55241985000100006

Cited by 2 publications

(2 citation statements)

References 18 publications

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“…These findings suggest that the POM pool found in the photic zone of the estuarine sectors was more represented by phytoplankton than bacteria and, consequently, that bacterial activities played a low influence on N:P:Si ratios. Under an annual analysis of POM contributors (phytoplankton and bacteria) in CIELC, Mesquita and Peres (1985) found non-significant correlation factors between POM and the numerical abundance of heterotrophic particles.…”

Section: N:p:si Ratios and Trophic State Index (Trix)mentioning

confidence: 87%

Sinking particles in the photic zone: relations with biogeochemical properties in different sectors of the Cananéia-Iguape Estuarine-Lagoon Complex (CIELC)-Brazil

Sutti,

Chiozzini,

Castro

et al. 2023

Ocean Coast. Res.

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Over the last decades, regional climate changes, erosion, and heightened agricultural runoffs have increased nutrient and particle input in rivers, unbalancing the biogeochemical cycle of this suspended material along estuaries. In this context, particle fluxes in the euphotic zone, a very productive layer and important to maintain the food chain and estuarine preservation, require better understanding. This study aims to evaluate particle sedimentation fluxes in the photic zone of the Cananéia-Iguape Estuarine-Lagoon Complex (CIELC), considering sectors under different salinities and trophic statuses. A cylindrical sediment trap was installed at the base of the photic layer to measure particle fluxes and photopigments. Meanwhile, water samples were taken to measure temperature, salinity, pH, dissolved oxygen, and nutrients. Valo Grande (a freshwater domain) showed high nutrient concentrations, in which high fluxes of phaeopigments and chlorophyll-b highlighted the contribution of vegetable detritus to particle sinking. In the Batatais mangrove creek, the high fluxes of organic particles (675.32 mg m -2 d -1 ) and chlorophyll-a (98.40 mg m -2 d -1 ) evinced a high contribution of microplankton to carbon sinking. During the winter of 2018, flocculation processes were evinced in the flood tide of the Cananéia Bay as an important driver of sedimentation rates, with considerable fluxes of inorganic particles (1161.20 mg m -2 d -1 ) and chlorophyll-a (83.27 mg m -2 d -1 ). In the summer of 2019, we observed a lower flux in total particles (451.24 mg m -2 d -1 ) in a period of haline stratification. In the Ararapira Channel, the lowest organic particle fluxes (<100 mg m -2 d -1 ) were associated with ultra-oligotrophic conditions, indicating a low influence of microplankton on sinking particles. These findings suggest that freshwater input, tidal variation, and trophic status are relevant controls of sinking particles in different CIELC sectors.

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Section: N:p:si Ratios and Trophic State Index (Trix)mentioning

confidence: 87%

Sinking particles in the photic zone: relations with biogeochemical properties in different sectors of the Cananéia-Iguape Estuarine-Lagoon Complex (CIELC)-Brazil

Sutti,

Chiozzini,

Castro

et al. 2023

Ocean Coast. Res.

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“…No Brasil, estudos com comunidades bacterianas bênticas ainda não são muito numerosos. Estudos bacterianos em coluna de água foram realizados na região de Cananéia (SP) (Watanabe, 1980;Mesquita & Peres, 1985) e Ubatuba (SP) (Mesquita, 1993). Na região de Ubatuba (SP), área de estudo do presente projeto, nenhum estudo anterior sobre bactérias do sedimento foi realizado.…”

Section: Através Das Investigações Deunclassified

Dinâmica bacteriana em sedimentos costeiros de Ubatuba, São Paulo

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Numerical contribution of phytoplanktonic cells, heterotrophic particles and bacteria to size fractionated POC in the Cananéia estuary (25ºS 48ºW), Brazil

Cited by 2 publications

References 18 publications

Sinking particles in the photic zone: relations with biogeochemical properties in different sectors of the Cananéia-Iguape Estuarine-Lagoon Complex (CIELC)-Brazil

Sinking particles in the photic zone: relations with biogeochemical properties in different sectors of the Cananéia-Iguape Estuarine-Lagoon Complex (CIELC)-Brazil

Dinâmica bacteriana em sedimentos costeiros de Ubatuba, São Paulo

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