scholarly journals Phytoplankton composition of the Itaparica and Xingó reservoirs, São Francisco River, Brazil

2015 ◽  
Vol 75 (3) ◽  
pp. 616-627 ◽  
Author(s):  
NKC Aragão-Tavares ◽  
JS Severiano ◽  
AN Moura
Keyword(s):  
Water Cycle ◽  
Taxonomic Composition ◽  
Phytoplankton Composition ◽  
Hydroelectric Reservoirs ◽  
Biological Communities ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Fragilaria Crotonensis ◽  
Aulacoseira Granulata ◽  
Instrumental Role

AbstractThe installation of dams causes changes to the integrity of rivers and to the water cycle, performing an instrumental role in the organization of biological communities, including that of phytoplankton. In the present study, we analyzed the taxonomic composition of phytoplankton in two hydroelectric reservoirs on the São Francisco River, Itaparica and Xingó reservoirs. Samples were collected at quarterly intervals between December 2007 and September 2009, at 12 sampling stations in each reservoir, totaling 92 samples. We identified 110 species in the Itaparica reservoir and 136 in the Xingó reservoir, of which diatoms followed by green algae, played a major contribution to both reservoirs. Most of the species is rare and/or occasional. In the Itaparica reservoir, there were no very frequent species, although in the Xingó this category was represented by the diatoms Aulacoseira granulata (Ehrenberg) Simonsen and Fragilaria crotonensis Kitton. These results show that, despite the similarity in the composition of phytoplankton, the reservoirs studied certainly differed regarding their environmental conditions.

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.

scholarly journals CO-OCORRÊNCIA DE ESPÉCIES DE PEIXES NAS ÁREAS RASAS DA FOZ DO RIO SÃO FRANCISCO SE/AL

2021 ◽  
Vol 25 (03) ◽  
pp. 738-750
Author(s):  
Renato Luiz Bot Neto ◽  
◽  
Roberto Schwarz Júnior ◽  
Henry Louis Spach ◽  
Keyword(s):  
Influencing Factor ◽  
General Pattern ◽  
River Mouth ◽  
Competitive Interactions ◽  
Random Pattern ◽  
Biological Communities ◽  
Community Assemblage ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Occurrence Patterns

CO-OCURRENCE OF FISH SPECIES IN THE SHALLOW AREAS OF SÃO FRANCISCO RIVER MOUTH. The "rules of community assemblage" indicate that competitive interactions would be the main influencing factor in the structuring of biological communities, which generates a non-random pattern of co-occurrence caused by competitive exclusion. Thus, the present study aimed to investigate the co-occurrence patterns in the shallow environments of the mouth of the São Francisco River. Ichthyofauna data from the area were obtained through manual trawling carried out monthly on its banks between May 2017 and April 2018. The data were tabulated in presence/absence matrices and the analyzes were performed through comparisons with null models (random) in a computational environment R, with the EcoSimR package, and through 5000 randomizations. To quantify the co-occurrence patterns, the C-score metric was used, which calculates the species segregation pattern. The results obtained from the simulations showed that the general pattern found did not differ significantly from what was expected at random, indicating that competitive interactions were not the greatest influencing force in the structuring of ichthyofauna in the studied area.

Candomblé e Cinema de Animação: Estratégias de resistência e territorialidade

2021 ◽  
Author(s):  
Pâmela Peregrino ◽  
Edileuza Penha de Souza
Keyword(s):  
Poetic Language ◽  
Public Places ◽  
Sao Francisco River ◽  
The People ◽  
São Francisco River ◽  
Popular Knowledge ◽  
Stop Motion ◽  
Short Movie

The majority of the knowledge and philosophy of African roots find a great discrimination in public places in Brazil, rarely we see schools take in consideration those questions, popular knowledge and ways of living of those who follow those religions of African roots. Take in account that reality and seeking for changing it, the members of Abassá of goddess Òsùn of Idjemim, Paulo Afonso - BA, Bahia took the initiative of producing an animated stop motion movie about the Òrìṣà Òsùn. In this short motion “Òpárà de Òsùn: when everything is born” (2018) we can see the language of animation cinema being used to tell stories of Òrìṣàs like of a way clamouring the religiosity from people from traditional places and also a way of facing religious racism. In this work, we will present the process of production of a short motion, that took in consideration the bio system Caatinga and of the Sao Francisco river as a scenery of some events, staring from the sonorities and images produced by the people in the Terreiro and including the poetic language (could it be sounding and visual or spoken). From those elements, we reflect about the role played by this short movie on the empowerment of children and territorially as didactic and educative space.

scholarly journals Mayfly diversity in the brazilian tropical headwaters of Serra do Cipó

2005 ◽  
Vol 48 (6) ◽  
pp. 983-996 ◽  
Author(s):  
Michael Goulart ◽  
Marcos Callisto
Keyword(s):  
Taxonomic Richness ◽  
Dry Period ◽  
Lotic Ecosystems ◽  
River Watershed ◽  
Rainy Period ◽  
Sao Francisco River ◽  
Serra Do Cipó ◽  
São Francisco River ◽  
Dry Seasons ◽  
Doce River

The objectives of this study were to evaluate spatial and seasonal distribution, assemblage structure and substrate associations of mayfly nymphs in five lotic ecosystems in the headwaters of the Doce River and São Francisco River watersheds, Brazil. Samples were taken in 24 sampling stations during rainy and dry seasons in 1998. In total, 7,066 organisms were collected, belonging to 27 genera and 6 families of Ephemeroptera. The dominant taxa were Americabaetis, Paracloeodes, Leptohyphes and Hagenulus. During the rainy period, the São Francisco River watershed showed higher taxonomic richness, diversity and evenness, while in the dry period, the taxonomic richness was higher in Doce River watershed. No significant differences were found in the taxonomic richness, diversity, evenness and density of mayfly assemblages between the two studied sampling periods. The results suggested that the diversity of the mayfly assemblages in tropical headwaters of Serra do Cipó would be probably due to ecosystem and watershed characteristics.

scholarly journals Phytoplankton community of a polymictic reservoir, La Plata River basin, Uruguay

1999 ◽  
Vol 59 (4) ◽  
pp. 535-541 ◽  
Author(s):  
M. C. PÉREZ ◽  
S. BONILLA ◽  
G. MARTÍNEZ
Keyword(s):  
Spatial Heterogeneity ◽  
River Basin ◽  
Phytoplankton Community ◽  
Water Reservoir ◽  
Phytoplankton Composition ◽  
Phytoplankton Abundance ◽  
La Plata ◽  
Phytoplankton Distribution ◽  
Aulacoseira Granulata

This paper deals with the analysis of phytoplankton composition and abundance from four sampling stations at the polymictic system, Rincón del Bonete water reservoir in Uruguay. Sampling data were obtained in 4 seasonal periods between February and November 1993. A hundred and twenty-four taxa were identified, where Aulacoseira granulata (Ehrenb.) Simon., A. granulata var. angustissima (Muller) Simon., A. granulata var. angustissima f. spiralis, (Muller) Simon., A. cf. ambigua, (Grun.) Simon., A. cf.. distans (Ehrenb.) Simon., Cryptomonas spp. and Synedra ulna (Nitzsch) Ehrenberg, were always present. Phytoplankton abundance fluctuated between 29 (autumn) and 2129 (summer) ind/ml. The general dominance of Aulacoseira spp. could be related to the polymictic condition of the system. In cold months phytoplankton distribution was homogeneous among sampling stations, while in warm months, spatial heterogeneity was detected, suggesting that sampling stations can behave as independent compartments.

scholarly journals Induced reproduction and reproductive characteristics of Rhinelepis aspera Agassiz, 1829 (osteichthyes: Siluriformes, Loricariidae)

1998 ◽  
Vol 41 (3) ◽  
pp. 309-314 ◽  
Author(s):  
Yoshimi Sato ◽  
Nelsy Fenerich-Verani ◽  
José Roberto Verani ◽  
Hugo Pereira Godinho ◽  
Edson Vieira Sampaio
Keyword(s):  
Body Weight ◽  
Water Temperature ◽  
River Basin ◽  
Fertilization Rate ◽  
Pituitary Extract ◽  
Reproductive Characteristics ◽  
Sao Francisco River ◽  
Absolute Fecundity ◽  
São Francisco River

Rhinelepis aspera is the largest Loricariidae species found in the São Francisco river basin where it is now rarely caught. Brooders kept in tanks were hypophysed with crude carp pituitary extract (CCPE). Approximately 82% of the females responded positive to the treatment. The egg was opaque, demersal, round, yellow and adhesive. Egg stripping was done at 212 hour-degrees (= 8.2 h) after application of the second dose of CCPE (water temperature = 25-26 ºC). Hatching of the larvae occurred at 1022 hour-degrees (= 42.2 h), after fertilization of the eggs (water temperature =24-25 ºC). Fertilization rate of the eggs was 72%. Absolute fecundity (AF), initial fertility (IF) and final fertility (FF) in relation to the females' body weight are expressed, respectively, by the equations: AF = - 33993 + 122308 Wt (r² = 0.88), IF = - 14823 + 58619 Wt (r² = 0.71) and FF = - 6553 + 29741 (r² = 0.61)

scholarly journals Digenea of Hoplias intermedius and Hoplias malabaricus (Actinopterygii, Erythrinidae) from upper São Francisco River, Brazil

2015 ◽  
Vol 24 (2) ◽  
pp. 129-135 ◽  
Author(s):  
Danielle Priscilla Correia Costa ◽  
Cassandra Moraes Monteiro ◽  
Marilia Carvalho Brasil-Sato
Keyword(s):  
River Basin ◽  
Feeding Habits ◽  
Minas Gerais ◽  
New Host ◽  
Hoplias Malabaricus ◽  
Parasitic Fauna ◽  
Sao Francisco River ◽  
São Francisco River ◽  
New Location

A total of 103 specimens of Hoplias intermedius (Günther, 1864) and 86 specimens of H. malabaricus (Bloch, 1794) from the upper São Francisco River, State of Minas Gerais were collected between April 2011 and August 2013, and their parasitic fauna were investigated. Four species of Digenea were found: metacercariae of Austrodiplostomum sp., and Ithyoclinostomum sp.; and adult specimens of Phyllodistomum spatula Odhner, 1902, and Pseudosellacotyla lutzi (Freitas, 1941) Yamaguti, 1954. The prevalence of the metacercariae was higher than that of the adult digeneans of erythrinids from the upper São Francisco River as a result of piscivorous feeding habits of these adult erythrinids. The presence of metacercariae and adult digeneans indicate that they act as intermediate and definitive hosts, respectively, in their biological cycles. Hoplias intermedius is a new host for the four species of Digenea, and the São Francisco River basin is a new location for the known geographical distributions of P. spatula and P. lutzi.

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