Brycon opalinus

Autor: Rodrigues, Leydiane Nunes, Silva, Juliana Paulo Da, Lima, Fl��vio C��sar Thadeo, Ingenito, Leonardo Ferreira Da Silva, Duboc, Luiz Fernando, Machado, D��bora Ferreira, Sarmento-Soares, Luisa Maria
Rok vydání: 2021
Předmět:
DOI: 10.5281/zenodo.5733634
Popis: Brycon opalinus (Cuvier, 1819) Local name. Pirapitinga. Distribution and additional records. Brycon opalinus was previously known from the upper rio Para��ba do Sul and upper rio Doce basins in the states of S��o Paulo, Rio de Janeiro, and Minas Gerais, Brazil (Lima 2017). Its current geographical range is highly fragmented and restricted to some headwater tributaries of the rio Para��ba do Sul and rio Doce basins, with relatively healthy populations in some river stretches (Lima 2017). There is an old record for the species downstream from the rio Doce in Esp��rito Santo State, considered doubtful by Lima (2017) in view of the known preference of the species for headwater areas. Brycon opalinus is recorded herein for the first time from the rio Itapemirim (figure 5), a river system located in the southern portion of the Esp��rito Santo State. The specimens were all sampled in the upper rio Itapemirim basin, in the rio Bra��o Norte Direito, on a stretch limited upstream by Parque Estadual da Cachoeira da Fuma��a (PECF) and downstream by Central Geradora Hidrel��trica (CGH) Francisco Gross, near the mouth of tributaries. Habitat and ecological notes. Brycon opalinus is found in headwater areas, inhabiting small rivers, characterized by possessing slightly dark-stained to clear waters, and lentic stretches alternated with rapids (Lima 2017). All B. opalinus specimens collected in the rio Itapemirim basin were found in stretches close to rapids. The rio Bra��o Norte Direito near Parque Estadual da Cachoeira da Fuma��a, where the species was first recorded in this basin in the years 2012 and 2013, had a maximum width of 28.6 m, a maximum depth of about 2.2 m, and the river in this stretch has a fast current with rapids. The substrate is composed mainly of sand and pebbles, with scattered rocks. Water transparency in this river varies markedly throughout the year, with relatively low turbidity and clear waters during the dry season, and turbid waters, with low transparency, during the rainy season. The catchment area of the rio Bra��o Norte Direito is mostly deforested, being mainly composed of pastureland, with a few more vegetated areas in an initial phase of succession. Brycon opalinus is not known to undertake large migrations (Lima 2017). It is likely that this species uses the rio Bra��o Norte Direito as a migratory corridor and spawning area (this river stretch is approximately 18 km long). This assumption is based on the fact that only juveniles were recorded within the Parque Estadual da Cachoeira da Fuma��a (PECF) (Rodrigues 2013), which is situated downstream from a waterfall 144 meters high, which corresponds to a natural barrier for most of the aquatic fauna in this river. The PECF protects a preserved section of rio Bra��o Norte Direito, one of the main tributaries forming the rio Itapemirim. While the few recorded adult specimens were found downstream from the PECF, in the area comprised by CGH Francisco Gross.
Published as part of Rodrigues, Leydiane Nunes, Silva, Juliana Paulo Da, Lima, Fl��vio C��sar Thadeo, Ingenito, Leonardo Ferreira Da Silva, Duboc, Luiz Fernando, Machado, D��bora Ferreira & Sarmento-Soares, Luisa Maria, 2021, The genus Brycon M��ller & Troschel (Ostariophysi: Characiformes: Bryconidae) of Esp��rito Santo State, Brazil: new records and comments on conservation, pp. 145-156 in Zootaxa 5072 (2) on page 150, DOI: 10.11646/zootaxa.5072.2.3, http://zenodo.org/record/5733620
{"references":["Cuvier, G. (1819) Sur les poissons du sous-genre Hydrocyn [sic], sur deux nouvelles especes de Chalceus, sur trois nouvelles especes du Serrasalmes, et sur l'Argentina glossodonta de Forskahl, qui est l'Albula gonorhynchus de Bloch. Memoires du Museum National d'Histoire Naturelle (Serie A) Zoologie, 5, 351 - 379.","Lima, F. C. T. (2017) A revision of the cis-andean species of the genus Brycon Muller & Troschel (Characiformes: Characidae). Zootaxa, 4222 (1), 1 - 189. https: // doi. org / 10.11646 / zootaxa. 4222.1.1","Rodrigues, L. N. (2013) Ictiofauna do Parque Estadual da Cachoeira da Fumaca, Alegre-Ibitirama, regiao sul do ES Ictiofauna do Parque Estadual da Cachoeira da Fumaca, Alegre-Ibitirama, regiao sul do ES. Universidade Federal do Espirito Santo, Alegre, 50 pp."]}
Databáze: OpenAIRE
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