Channel curvature effects on estuarine circulation in a highly stratified tropical estuary: The São Francisco river estuary (Brazil)

2020 ◽  
Vol 238 ◽  
pp. 106723 ◽  
Author(s):  
Bárbara P. Paiva ◽  
Eduardo Siegle ◽  
Carlos A.F. Schettini
Keyword(s):  
River Estuary ◽  
Estuarine Circulation ◽  
Tropical Estuary ◽  
Sao Francisco River ◽  
Curvature Effects ◽  
São Francisco River ◽  
Channel Curvature

scholarly journals INSIGHTS ON THE INFLUENCE OF PHYLOGENETIC ON THE RELATIVE GROWTH USING Atherinella brasiliensis AS A TOOL

2021 ◽  
Vol 47 ◽  
pp. e640
Author(s):  
Renato Luiz BOT NETO ◽  
Barbara Maichak de CARVALHO ◽  
Roberto SCHWARZ JÚNIOR ◽  
Henry Louis SPACH
Keyword(s):  
Frequency Distribution ◽  
Environmental Influence ◽  
River Estuary ◽  
Weight Ratio ◽  
Brazilian Coast ◽  
Constant Input ◽  
Growth Coefficient ◽  
Relative Growth ◽  
Sao Francisco River ◽  
São Francisco River

The length–weight relationships (LWR) are important tools for ichthyology, they are useful to demonstrate the environmental influence on growth. In this study we estimate the LWR of the Atherinella brasiliensis in the shallow areas of the São Francisco river estuary and compare the growth of this specie in different environments of the Brazilian coast. Specimens of Brazilian silverside (A. brasiliensis, n = 3483), between 2.1 and 13.6 cm in length, were caught in the shallow areas of the São Francisco River estuary between May 2017 and April 2018. The length-weight ratio of the species was represented by the equation y=0.0047x3.0913. Frequency distribution indicates that the species is present in the shallow areas of the São Francisco River estuary in all its ontogenetic stages and apparently reproduces throughout the year with constant input of recruits into the population. Von Bertalanffy’s growth model and longevity were adjusted to reach asymptotic length (L∞) of 14.7 cm, growth coefficient (K) of 0.91 year-1 and longevity (A95) of 3.25 years. The analysis of variance revealed differences for the maximum total length. However, the differences found between the present study and data available in the literature appear to be caused by environmental and methodological differences.

scholarly journals Mangrove Soil in Physiographic Zones in the Sao Francisco River Estuary

2018 ◽  
Vol 25 (2) ◽  
Author(s):  
Karen Viviane Santana de Andrade ◽  
Francisco Sandro Rodrigues Holanda ◽  
Tiago de Oliveira Santos ◽  
Mykael Bezerra Santos Santana ◽  
Renisson Neponuceno de Araújo Filho
Keyword(s):  
River Estuary ◽  
Sao Francisco River ◽  
Mangrove Soil ◽  
São Francisco River

scholarly journals Circulation and salt balance in the São Francisco river Estuary (NE/Brazil)

RBRH ◽  
2017 ◽  
Vol 22 (0) ◽  
Author(s):  
Geórgenes Cavalcante ◽  
Luiz Bruner de Miranda ◽  
Paulo Ricardo Petter Medeiros
Keyword(s):  
River Discharge ◽  
Neap Tide ◽  
Spring Tide ◽  
River Estuary ◽  
Salt Transport ◽  
Salt Flux ◽  
Sao Francisco River ◽  
Tidal Cycles ◽  
São Francisco River ◽  
And Diffusion

ABSTRACT In order to evaluate how river discharge and tidal currents forcing influence the circulation and salt transport within the São Francisco River-Estuary, a two 25 hour surveys campaigns and along-channel profiles were performed in the estuary main channel (18/19 and 25/26 February 2014). The current intensity showed higher asymmetry between flood (v<0) and ebb (v>0) currents in spring tide (-0.6 and 1.1 m/s), as compared to neap tide (-0.4 and 1.0 m/s), which was attributed to the intense buoyancy energy enhanced by the stronger discharge in spring. Overall, salinity presented high stratified conditions and varied between 0.0<S<36.6, and 0.5<S<36.1 from surface to bottom, during spring and neap, respectively. Although river discharge reduced from spring to neap tide partially mixed-highly stratified conditions (type 2b) remained in both periods, with advection and diffusion contributing with 34% and 66% to the net upstream salt flux in spring, respectively, and 56% and 44% in neap tide, respectively, which was attributed to the balance of tidal and baroclinic forcing and river discharge. The dominant downstream advective salt transport in both spring (12.5 kg.m-1s-1) and neap (15.2 kg.m-1s-1) tidal cycles suggests that there is little salt accumulation inside the São Francisco estuary.

scholarly journals LITTERFALL PRODUCTION IN MANGROVE FORESTS OF THE SÃO FRANCISCO RIVER ESTUARY, SERGIPE STATE, BRAZIL

FLORESTA ◽  
2019 ◽  
Vol 49 (4) ◽  
pp. 813
Author(s):  
Tiago De Oliveira Santos ◽  
Francisco Sandro Rodrigues Holanda ◽  
Luciano Carlos Sobral De Menezes ◽  
Karen Viviane Andrade Santana ◽  
Renisson Neponuceno De Araújo Filho
Keyword(s):  
River Estuary ◽  
Mangrove Forests ◽  
Sao Francisco River ◽  
Litterfall Production ◽  
São Francisco River

Temporal streamflow reduction and impact on the salt dynamics of the São Francisco River Estuary and adjacent coastal zone (NE/Brazil)

2020 ◽  
Vol 38 ◽  
pp. 101363 ◽  
Author(s):  
Geórgenes Cavalcante ◽  
Filipe Vieira ◽  
Edmo Campos ◽  
Nilva Brandini ◽  
Paulo R.P. Medeiros
Keyword(s):  
Coastal Zone ◽  
River Estuary ◽  
Sao Francisco River ◽  
São Francisco River

Anthropogenic activities on mangrove areas (São Francisco River Estuary, Brazil Northeast): A GIS-based analysis of CBERS and SPOT images to aid in local management

2014 ◽  
Vol 89 ◽  
pp. 39-50 ◽  
Author(s):  
Luciana Cavalcanti Maia Santos ◽  
Humberto Reis Matos ◽  
Yara Schaeffer-Novelli ◽  
Marília Cunha-Lignon ◽  
Marisa Dantas Bitencourt ◽  
...  
Keyword(s):  
Anthropogenic Activities ◽  
River Estuary ◽  
Local Management ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Phytoplankton community structure of the São Francisco river estuary (Piaçabuçu-Alagoas-Brazil): a study of its diversity

2011 ◽  
Vol 15 (1) ◽  
pp. 95 ◽  
Author(s):  
Enaide Marinho Melo-Magalhães ◽  
Ariadne Nascimento Moura ◽  
Paulo Ricardo Petter Medeiros ◽  
Elvidio Landim do Rego Lima ◽  
Maria Luise Koening
Keyword(s):  
Community Structure ◽  
Phytoplankton Community ◽  
River Estuary ◽  
Phytoplankton Community Structure ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in Cerrado streams of Paraguay, Paraná, and São Francisco river basins

2013 ◽  
Vol 13 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Renato de Mei Romero ◽  
Mônica Ceneviva-Bastos ◽  
Gustavo Henrique Baviera ◽  
Lilian Casatti
Keyword(s):  
Community Structure ◽  
Aquatic Insects ◽  
Regional Differences ◽  
River Basins ◽  
Taxonomic Composition ◽  
Taxonomic Resolution ◽  
Sao Francisco River ◽  
Original Distribution ◽  
São Francisco River

We evaluated qualitatively and quantitatively the community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in 19 streams in areas of Cerrado in the Paraguay, Paraná, and São Francisco river basins. The number of genera and taxonomic composition were compared at spatial (at the hydrographic basins level) and conservation levels (more preserved and less preserved areas). The influence of spatial and environmental factors in richness and abundance was also evaluated. The geographical distribution of Grumicha, Coryphorus, and Austrotinodes was expanded. The highest Trichoptera richness was found in the São Francisco river basin (F = 5,602, p = 0,004) and a higher number of Ephemeroptera genera occurred in the relatively less preserved sites (F = 6,835, p = 0,009). The pattern of genera distribution was different among basins (R = 0,0336, p = 0,001), but it was similar among relatively less and more preserved areas (R = -0,039, p = 0,737). These findings can be explained by the low impact level in these streams and also by the taxonomic resolution used in this study. Latitude and instream diversity were the most important factors to explain the variation in genera richness and abundance (p = 0.004 and p = 0.026, respectively). Hence, the regional differences can be attributed to spatial influences, quantity or quality of habitats and the original distribution of taxa within each basin.

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