Profiles of sex steroids, fecundity, and spawning of the curimatã-pacu Prochilodus argenteus in the São Francisco River, downstream from the Três Marias Dam, Southeastern Brazil

2010 ◽  
Vol 118 (2-4) ◽  
pp. 330-336 ◽  
Author(s):  
Fábio. P. Arantes ◽  
Helio B. Santos ◽  
Elizete Rizzo ◽  
Yoshimi Sato ◽  
Nilo Bazzoli
Keyword(s):  
Sex Steroids ◽  
Southeastern Brazil ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Effects of extended absence of flooding on the fish assemblages of three floodplain lagoons in the middle São Francisco River, Brazil

2006 ◽  
Vol 4 (4) ◽  
pp. 427-433 ◽  
Author(s):  
Paulo dos Santos Pompeu ◽  
Hugo Pereira Godinho
Keyword(s):  
Fish Species ◽  
Fish Assemblages ◽  
Local Extinction ◽  
Management Tool ◽  
Southeastern Brazil ◽  
Water Volume ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Large Water ◽  
To Receive

In the Neotropics, a large proportion of fish communities of large rivers use floodplain as habitats for feeding, reproduction, and refuge. An evaluation was made of the effects of extended dry periods on the species richness, abundance and local extinction of fish species in three marginal lagoons in the middle São Francisco River, southeastern Brazil. The studied lagoons fail to receive river floods during the study period (1994-1996). A gradual reduction in richness and abundance was observed in all lagoons. Migratory fish species had the highest probability to become extinct in the two lagoons that remained with large water volume. Species tolerant to low levels of dissolved oxygen had the lowest probability of local extinction in the lagoon showing an abrupt reduction in water volume. Similar changes to those observed in the current study are likely to occur in the floodplains if dams would be constructed in this segment of the river. Adequate water releases from Três Marias reservoir, located upstream, should be considered as a management tool for producing episodic flooding on the marginal lagoons of the region.

Impact of the Três Marias dam on the reproduction of the forage fish Astyanax bimaculatus and A. fasciatus from the São Francisco River, downstream from the dam, southeastern Brazil

2013 ◽  
Vol 97 (3) ◽  
pp. 309-319 ◽  
Author(s):  
Felipe Talin Normando ◽  
Kleber Biana Santiago ◽  
Marcos Vinícius Teles Gomes ◽  
Elizete Rizzo ◽  
Nilo Bazzoli
Keyword(s):  
Southeastern Brazil ◽  
Forage Fish ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Patterns of parasitism by Amblyomma rotundatum (Ixodidae) on Rhinella schneideri (Bufonidae) in islands of São Francisco River, Minas Gerais, Brazil

2015 ◽  
Vol 35 (6) ◽  
pp. 579-582 ◽  
Author(s):  
Hermes Ribeiro Luz ◽  
João Luiz Horacio Faccini ◽  
Hélio Ricardo da Silva
Keyword(s):  
Dry Season ◽  
Southeastern Brazil ◽  
Wet Season ◽  
Mean Intensity ◽  
Sao Francisco River ◽  
Hind Limbs ◽  
Hydroelectric Dam ◽  
São Francisco River ◽  
Rhinella Schneideri ◽  
Peak Abundance

Abstract: We sampled ticks from specimens of the rococo toad Rhinella schneideriby flannel dragging on two Islands located in the São Francisco River near the Três Marias hydroelectric dam, southeastern Brazil. A total of 120 toads was examined, of which 63 (52.5%) were parasitized only by Amblyomma rotundatumtotaling 96 larvae, 163 nymphs and 134 females. The burden of parasitism ranged from one to 43 ticks, with a mean intensity of infestation of 6.2±5.5 ticks per host. The tick A. rotundatumexhibited highly aggregated distribution. Peak abundance of larvae and nymphs occurred in the dry season (May to September), whereas peak abundance of females occurred in the wet season (October to April). We collected most ticks near the head and hind limbs of R. schneideri. The finding of two engorged A. rotundatumnymphs in the same resting places of two toads and the absence of this species in the dragged areas suggest a nidicolous behavior at the studied site.

scholarly journals First avifaunal survey of a Cerrado dry forest enclave on the right bank of the São Francisco River, Minas Gerais, Brazil, with insights on geographic variation of some species

2018 ◽  
Vol 58 ◽  
pp. 15
Author(s):  
Marcelo Ferreira de Vasconcelos ◽  
Santos D’Angelo Neto
Keyword(s):  
Geographic Variation ◽  
Minas Gerais ◽  
Dry Forest ◽  
Southeastern Brazil ◽  
Left Bank ◽  
Dry Forests ◽  
Sao Francisco River ◽  
Intermediate Phenotypes ◽  
São Francisco River ◽  
The Right

Cerrado dry forest enclaves have been treated as an endemic bird area. In the last years, some avifaunal surveys have been conducted in dry forests on the left bank of the São Francisco River, eastern Brazil. Nevertheless, there is a gap of detailed ornithological surveys in the Cerrado dry forest enclaves on the right bank of this river. Here, we present the first avifaunal survey of a Cerrado dry forest enclave on the right bank of the São Francisco River. The study area, named “Curral de Pedras”, comprises a dry forest enclave and other associated habitats in central Minas Gerais state, southeastern Brazil. We recorded 172 bird species; nine taxa have their ranges strongly associated to the Caatinga; six present their ranges associated to the Atlantic Forest and one is typical of the Cerrado. Important records are those of Campylopterus calcirupicola, a recently described species associated with dry forests of central Brazil, and Celeus ochraceus, collected in its southernmost range. Furthermore, we obtained specimens that present intermediate phenotypes between the following woodcreeper species: Lepidocolaptes squamatus / L. wagleri and Xiphocolaptes albicollis / X. falcirostris. Those records reinforce the need of further sampling and collecting activities in those dry forest enclaves aiming future researches in taxonomy, geographic variation, and phylogeography.

Certain species of Plecoptera from the headwater springs of National Integration River (São Francisco), Brazil

Zootaxa ◽  
2018 ◽  
Vol 4429 (1) ◽  
pp. 195
Author(s):  
MARCOS CARNEIRO NOVAES ◽  
DIOGO SILVA VILELA ◽  
VINICIUS MARQUES LOPEZ ◽  
RHAINER GUILLERMO NASCIMENTO FERREIRA
Keyword(s):  
New Species ◽  
National Park ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
National Integration ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Minas Gerais State ◽  
A New Species

Specimens of Anacroneuria Klapálek 1909 (Plecoptera: Perlidae) and Tupiperla Froehlich 1969 (Plecoptera: Gripopterygidae) from the headwater springs of the National Integration River (São Francisco River), Serra da Canastra National Park, in Minas Gerais State, of southeastern Brazil, were studied. A new species, Anacroneuria saofrancisco n. sp. is described and the descriptions of the nymph and the female of A. saofrancisco are also presented. 

scholarly journals Does predator benefits prey? Commensalism between Corynoneura Winnertz (Diptera, Chironomidae) and Corydalus Latreille (Megaloptera, Corydalidae) in Southeastern Brazil

2006 ◽  
Vol 23 (2) ◽  
pp. 569-572 ◽  
Author(s):  
Marcos Callisto ◽  
Michael D.C. Goulart ◽  
Pablo Moreno ◽  
Rogério P. Martins
Keyword(s):  
Body Size ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
Sao Francisco River ◽  
Serra Do Cipó ◽  
São Francisco River ◽  
Minas Gerais State

Commensalism between Corydalus Latreille, 1802 (Megaloptera, Corydalidae) and Corynoneura Winnertz, 1846 (Diptera, Chironomidae, Orthocladiinae) larvae was recorded in Indaiá stream, at 1,380 m a.s.l. (Parque Nacional da Serra do Cipó, 19º-20ºS, 43º-44ºW) and in the headwaters of São Francisco river, at 1,300-1,700 m a.s.l. (Parque Nacional da Serra da Canastra, 20º00'-20º30'S, 46º15'-47º00'W), in Minas Gerais state, Brazil. Seventy eight Corydalus larvae (range 22-88 mm) were sampled: 61 in the Indaiá stream and 17 in other two streams. Twelve Corydalus larvae (22-79 mm) in the Indaiá stream and three out of 15 larvae in the headwaters of São Francisco river (38-50 mm) had Corynoneura, larvae and pupae on their gills (3rd to 6th) and a few larvae attached to the abdominal segments of larger Corydalus larvae (> 25 mm). Sixty-nine larvae of Corynoneura were found in the regurgitated material from Corydalus. It is remarkable that by attaching to larger body size predators, prey could become free from predator bouts and could also be transported by them.

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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