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| Registros recuperados: 11 | |
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| Prado,Marina Rodrigues do; Carvalho,Débora Reis de; Alves,Carlos Bernardo Mascarenhas; Moreira,Marcelo Zacharias; Pompeu,Paulo Santos. |
| ABSTRACT This study aimed to evaluate if the presence of pollutants promotes changes in feeding habits of fish species from different trophic guilds: the detritivorous species, Hypostomus francisci, and the piscivorous, Hoplias intermedius. Both species were sampled at 12 sites (with different degrees of pollution) in the Rio das Velhas basin, which is heavily polluted by domestic and industrial sewage from the Metropolitan Region of Belo Horizonte (MRBH). Stable isotope analyses of carbon (δ13C) and nitrogen (δ15N) of fish tissue and the main food resources were performed. Fishes from both trophic guilds altered their diets in degraded environments, but the detritivorous species showed greater trophic plasticity. The isotopic niche of both trophic guilds... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Detritivorous; Hoplias intermedius; Hypostomus francisci; Piscivorous; Stable isotopes. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100203 |
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| Junqueira,Nara Tadini; Leal,Cecília Gontijo; Alves,Carlos Bernardo Mascarenhas; Pompeu,Paulo Santos. |
| The rio das Velhas, located in central Minas Gerais State (Brazil), is a major tributary of the rio São Francisco. Despite several anthropogenic pressures, this basin supports more than 115 fish species. The aim of this study was to compare the morphological space occupied by fish assemblages in four regions (headwaters, upper, middle, and lower course) along the channel of the rio das Velhas. We try to answer the following question: Is there a change in the morphological organization of the fish along the longitudinal gradient of the river? Individuals from 67 species, collected at several sites in the basin from 1999 to 2008, were measured for 11 morphological attributes related to swimming behavior and habitat use. Through the graphs, the first two... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community ecology; Ichthyofauna; Interspecific variation; Morphometry; Rio São Francisco. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000200017 |
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| Suzuki,Fábio Mineo; Pires,Lucas Vilela; Pompeu,Paulo Santos. |
| The objective of this study was to evaluate the passage of fish eggs and larvae through the Funil, Itutinga and Camargos Reservoirs, located in the upper Rio Grande basin, Minas Gerais, Brazil. Samples were taken downstream and upstream of the dams using a conical ichthyoplankton net and were collected every two weeks, twice per sampling day, between November 2008 and March 2009. Although eggs and larvae were abundant immediately upstream of the reservoirs, no ichthyoplankton were captured immediately downstream of the dams, possibly indicating that eggs and larvae do not pass through the reservoirs. The arrival of ichthyoplankton in the reservoirs without its effective passage downstream makes the survival of these eggs and larvae unlikely. Furthermore,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Downstream migration; Ichthyoplankton; Migratory fish; Spawning. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300014 |
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| Santos,Hersília de Andrade e; Leal,Cecília Gontijo; Pompeu,Paulo Santos; Chaves,Ceceo; Cunha,Stephanie Fernandes. |
| ABSTRACT Physical habitat simulation (PHABSIM) is an important step of the instream flow incremental methodology (IFIM), which is applied to establish environmental flow regimes. This study applied the PHABSIM in two reaches of the Velhas river basin, whose long-term discharges are similar but are under different degrees of impact. Suitability curves were obtained for fish species using traditional methods (Astyanax sp., Piabarchus stramineus, Piabina argentea and Serrapinnus heterodon) and generalized additive models for fish density (Astyanax sp., P. argentea and S. heterodon). The results of habitat use depended on the method for curves generation. Applying the suitability curves by traditional methods, different discharge scenarios were simulated. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental flow; GAM models; Habitat suitability curves; Hydrological scenarios; Velhas River. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400210 |
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| Loures,Raquel Coelho; Pompeu,Paulo Santos. |
| Damming rivers to generate hydroelectric energy causes a series of changes in the environment, including impacts on the ichthyofauna. Knowledge of the fish community immediately downstream from a hydroelectric dam can help to reduce the negative effects of dam operation, such as fish entrance into the draft tube during turbines maintenance. We evaluated the temporal variation in fish community composition and abundance, near Três Marias Hydroelectric Dam (TMD), and its relationship with abiotic variables. Samples (n = 18) were carried out using gill nets in the tailrace of the dam, over the course of a hydrological year, at six time points during a 24-hour period. Abiotic data were also sampled to assess the relationship with the biotic data. In the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish kill; Ichthyofauna; Impact; Nictemeral; Operation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000400006 |
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| Registros recuperados: 11 | |
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