Diatomáceas cêntricas da zona de arrebentação de uma ilha amazônica.

Matos, Jislene Brito; Cardoso, Eliz Helena Nogueira; Pereira, Luci Cajueiro Carneiro; Costa, Rauquı́rio Marinho da

doi:10.5914/tropocean.v41i1-2.5414

Cited by 4 publications

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“…In the surf zone, the resuspension of sediments results in the exchange of benthic microalgae, which become part of plankton (tychoplankton), thus causing dramatic changes in the structure of the phytoplankton community as a whole (Sousa et al 2009, Matos et al 2013. At Ajuruteua beach, the strong Spearman correlation coefficient (r) -Significant correlations (p < 0.05) were observed between salinity, chlorophyll-a and dissolved nutrient (phosphate and silicate) concentrations and the characteristics of the phytoplankton community.…”

Section: Discussionmentioning

confidence: 97%

“…The occurrence and distribution of phytoplankton have been analyzed on other beaches in northeastern Pará, such as Princesa beach on Algodoal Island (Matos et al 2012(Matos et al , 2013 and Atalaia beach, in the town of Salinópolis ), but no general pattern has yet been determined in this region. Given this, the present study evaluates the composition and temporal variation in the phytoplankton community of Ajuruteua beach, considering variables not previously analyzed, such as dissolved nutrient concentrations, together with other local hydrological, hydrodynamic and climatic variables in order to improve the knowledge of the dynamics of phytoplankton populations in the Amazon Coastal Zone.…”

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confidence: 99%

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Structure and temporal variation of the phytoplankton of a macrotidal beach from the Amazon coastal zone

Matos

Oliveira

Pereira

et al. 2016

An. Acad. Bras. Ciênc.

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The present study aimed to analyze the structure and the temporal variation of the phytoplankton of Ajuruteua beach (Bragança, Pará) and to investigate the influence of environmental variables on the dynamics of this community to provide a basis about the trophic state of this environment. Biological, hydrological and hydrodynamic samplings were performed during a nyctemeral cycle in the months of November/08, March/09, June/09 and September/09. We identified 110 taxa, which were distributed among the diatoms (87.3%), dinoflagellates (11.8%) and cyanobacteria (0.9%), with the predominance of neritic species, followed by the tychoplankton species. Chlorophyll-a concentrations were the highest during the rainy period (24.5 mg m -3 ), whereas total phytoplankton density was higher in the dry period(1,255 x 10 3 cell L -1 ). However, phytoflagellates density was significantly higher during the rainy period.Cluster Analysis revealed the formation of four groups, which were influenced by the monthly differences in the environmental variables. The Principal Component Analysis indicated salinity and chlorophyll-a as the main variables that explained the components. Spearman correlation analysis supported the influence of these variables on the local phytoplankton community. Overall, the results obtained suggest that rainfall and strong local hydrodynamics play an important role in the dynamic of the phytoplankton of Ajuruteua beach, by influencing both environmental and biological variables.

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Section: Discussionmentioning

confidence: 97%

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confidence: 99%