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| Leal,Cecília G.; Junqueira,Nara T.; Santos,Hersília de A. e; Pompeu,Paulo S.. |
| O presente estudo teve como objetivo investigar os padrões local e regional de uso de habitat de Piabina argentea Reinhardt, 1867 em quatro diferentes rios da bacia do rio das Velhas. Os habitat amostrados foram caracterizados quanto à velocidade da água, profundidade e tipo de substrato. Para a análise ecomorfológica, foram calculados 17 atributos ecomorfológicos de 40 exemplares de cada rio. Embora estas populações tenham se sobreposto no espaço ecomorfológico, a Análise Discriminante Canônica mostrou haver diferença significativa entre elas, principalmente da população do rio das Velhas em relação às demais. A separação se deu em termos do índice de compressão, altura relativa do corpo e índice de achatamento ventral. Os padrões locais de seleção de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecomorfologia; Sobreposição morfológica; Variação intraespecífica; Bacia do rio São Francisco. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212013000300003 |
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| Lopes,João M.; Alves,Carlos B. M.; Silva,Fernanda O.; Bedore,Alessandra G.; Pompeu,Paulo S.. |
| ABSTRACT Implantation of telemetry transmitters in fish can be affected by different parameters. This study aimed to evaluate the effect of type of anesthetic, tag size, and surgeon experience on surgical and postsurgical wound healing in the neotropical fish Prochilodus lineatus . In total, eighty fish were surgically implanted with telemetry transmitters and forty fish were kept as controls. Forty fish were implanted with a small tag and other forty were implanted with a large tag. Similarly, forty fish were anesthetized with eugenol and forty fish were anesthetized by electroanesthesia, and forty surgeries were performed by an expert surgeon and forty surgeries were performed by novice surgeons. At the end of the experimental period seventeen (21.3%)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Incision; Infection; Postsurgical complications; Telemetry; Wound Healing. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000300209 |
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| Lira,Nibelle A.; Pompeu,Paulo S.; Agostinho,Carlos S.; Agostinho,Angelo A.; Arcifa,Marlene Sofia; Pelicice,Fernando M.. |
| ABSTRACT River regulation has fragmented fluvial ecosystems in South America, affecting fish migration and dispersion dynamics. In response, authorities have installed fish passage facilities (FPF) to mitigate impacts. However, little is known about the geographical distribution of these facilities, and no synthesis of the research effort applied to understanding their functioning and limitations exists. To address this issue, our study gathered the available scientific literature about fishways in South America to provide an overview of studied FPF and associated research effort. We found 80 studies that investigated 25 FPF, mostly ladders installed in the upper reaches of large rivers, particularly in the Paraná River Basin. One important finding is that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation; Dam; Fishway; Impact; Management. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200217 |
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| Souza,Marcela A.; Fagundes,Daniela C.; Leal,Cecília G.; Pompeu,Paulo S.. |
| In the present study, we assessed the ecomorphology of two species of Astyanax in streams with different substrates found in the Rio São Francisco Basin. The dominant substrate of each stream was defined as either "fine" (0 to 2 mm), "gravel" (2 to 250 mm), "rock" (> 250 mm), or "leaf bank". We analyzed a total of 22 ecomorphological attributes of Astyanax intermedius Eigenmann, 1908 (127 individuals) and Astyanax rivularis (Lütken, 1875) (238 individuals) adults. We detected significant ecomorphological differences between the populations of A. rivularis and A. intermedius from habitats with different types of substrates. However, the two species did not show the same morphological differences depending on the type of substrate. These results confirmed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Convergence; Divergence; Ecomorphological attributes; Freshwater fish; Habitat diversity; Intraspecific differences. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000100006 |
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| Alonso,Mirella B.; Carvalho,Débora R. de; Alves,Carlos B. M.; Moreira,Marcelo Z.; Pompeu,Paulo S.. |
| ABSTRACT The trophic plasticity of most fish species of Astyanax Baird & Girard, 1854 in response to environmental changes and resource availability is high. This work evaluates the differences in the trophic characteristics of two congeneric species, Astyanax taeniatus (Jenyns, 1842) and Astyanax lacustris (Lütken, 1875), in Rio das Velhas Basin, which is highly impacted by the discharge of sewage from the Metropolitan Region of Belo Horizonte (MRBH). Eight sites were sampled and grouped into three regions: upper course (two sites upstream of the MRBH); middle course (three sites located in the middle portion of the Rio das Velhas, region with greater influence of the MRBH), and lower course (three sites downstream of the MRBH). Samples of fish and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astyanax lacustris; Astyanax taeniatus carbon; Nitrogen enrichment; Stable isotopes; Stomach contents. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702019000100318 |
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| Castro,Miriam A. de; Santos,Hersília de A.; Sampaio,Francisco A. C.; Pompeu,Paulo S.. |
| Very little research has been conducted on the swimming capacity of Neotropical fish. The few studies available have focused on large migratory species. The present study used fixed and increasing velocity tests to determine prolonged and sustained speeds of the "pequira", Bryconamericus stramineus Eigenmann, 1908, a small, abundant species found in fish passages implemented at the Paraná basin, Brazil. The results of increasing velocity tests showed significant relationships between critical speeds, total and standard lengths, and body weight. When compared with other Neotropical fish, the "pequira" is able to swim faster than individuals of other species of similar length. The point of change from sustained to prolonged swimming was found to occur at an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Critical speed; Fish passage; Prolonged swimming; Tetragonopterinae. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600015 |
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