Data/hora: 02/06/2024 13:50:01

Provedor de dados: | 83
País: | Brazil
Título: | Changes in the structure of fish assemblages in streams along an undisturbed-impacted gradient, upper Paraná River basin, Central Brazil
Autores: | Dias,Alesandra Martins; Tejerina-Garro,Francisco Leonardo.
Data: | 2010-01-01
Ano: | 2010
Palavras-chave: | Anthropogenic impacts; Conservation unit; Meia Ponte River; Altamiro de Moura Pacheco.
Resumo: | The João Leite River is located in the upper Paraná basin, Central Brazil. It drains areas covered by Cerrado vegetation interspersed with urban and agricultural areas. This study aims to asses changes of the fish assembleges structure along a undisturbed-impacted gradient in ten stream stretches using ecological descriptors, a similarity index and the abundance-biomass relationship (ABC curves). The fish were collected during the dry period using electrofishing gear in stretches of 50 m. Results show that the environmental variation observed along the undisturbed-impacted gradient considered influences on fish assemblage structure. Both richness and diversity differences between fish assemblages are partially influenced by stream stretch orthonian order and anthropogenic impacts. ABC curves classified six stream stretches located in preserved or impacted areas as undisturbed while four stretches were classified as disturbed. This is attributed to the influence of the undisturbed habitat within the conservation unit and the presence of K- or r- strategist species. This type of study contributes to an understanding of the effects of aquatic environment conservation on the Brazilian Cerrado core area, where the choice of conservation areas prioritizes terrestrial over aquatic aspects.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000300003
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252010000300003
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.8 n.3 2010
Fonte: | info:eu-repo/semantics/openAccess