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Provedor de dados:  Neotropical Ichthyology
País:  Brazil
Título:  Conservation status and bio-ecology of Brycon orbignyanus (Characiformes: Bryconidae), an endemic fish species from the Paraná River basin (Brazil) threatened with extinction
Autores:  Tonella,Lívia Helena
Dias,Rosa Maria
Vitorino Junior,Oscar Barroso
Fugi,Rosemara
Agostinho,Angelo Antonio
Data:  2019-01-01
Ano:  2019
Palavras-chave:  Dam
Diet
Floodplain
Ontogeny
Recruitment
Resumo:  ABSTRACT Brycon orbignyanus is an endemic species from La Plata basin whose stocks have been presenting significant reductions throughout the Paraná River. Brycon orbignyanus is categorized as an endangered species. This study evaluated aspects of the bio-ecology of this species that may be related to this threat, highlighting its distribution, abundance, and diet as well as the corresponding relationships between its recruitment and flood regimes. Data were obtained from different parts of the upper Paraná River (stretches free and regulated by dams) from 1986 to 2010 with more detailed data collected from the free remnant of this basin. The results indicate that no records for species exist at more than half of the sampling points located in dam-regulated sections of the Paraná River, whereas specimens were collected from 75% sites in the free plain remnant. We observed a remarkable effect of the hydrological regime on recruitment as well as distinct food demands during ontogenetic development, with adults almost exclusively consuming fruits and seeds, revealing that these individuals are supported by riparian vegetation. Thus, it is concluded that changes in the natural flood regime as well as riparian vegetation removal threaten B. orbignyanus populations in the Paraná River basin.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000300207
Editor:  Sociedade Brasileira de Ictiologia
Relação:  10.1590/1982-0224-20190030
Formato:  text/html
Fonte:  Neotropical Ichthyology v.17 n.3 2019
Direitos:  info:eu-repo/semantics/openAccess
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