Structure and composition of the stream ichthyofauna of four tributary rivers of the upper Rio Parana basin, Brazil

Autor: Castro, Rmc, Casatti, L., Santos, He, Vari, Rp, Melo, Ala, Martins, Lse, Abreu, Tx, Benine, Rc, Gibran, Fz, Ribeiro, Ac, Bockmann, Fa, Murilo Carvalho, Pelicao, Gzp, Ferreira, Km, Stopiglia, R., Akama, A.
Přispěvatelé: Universidade de São Paulo (USP), Universidade Estadual Paulista (Unesp), Natl Museum Nat Hist, Universidade Estadual Paulista (UNESP), Smithsonian Institution
Zdroj: ResearcherID
Web of Science
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Scopus
Popis: Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2014-02-26T17:22:54Z No. of bitstreams: 0 Made available in DSpace on 2014-02-26T17:22:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-09-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T14:03:19Z No. of bitstreams: 0 Made available in DSpace on 2014-05-20T14:03:19Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-09-01 The ichthyofauna of 24 stretches of streams, all of 100 m length and of fifth or lower order and most of second and third order, were sampled along four left bank tributaries (Rio do Peixe, Rio Aguapei, Rio Sao Jose dos Dourados, lower Rio Tiete of the main channel of the Rio Parana in the state of São Paulo, southeastern Brazil. Sampling of the fish fauna at each of the six sites in the four basins incorporated a standardized fish collecting methodology and a standardized documentation of environmental data serving as the basis for a comparative analysis of the collecting locations. The 8,189 fish specimens collected represented six orders, 18 families, 42 genera, and 56 species, with a total biomass of 28.8 kg. Approximately 52% of the collected species were characiforms, 28% siluriforms, 9% gymnotiforms, 5% cyprinodontiforms, 4% perciforms, and 2% synbranchiforms. The most abundant of the species were the characiforms Astyanax altiparanae (15% of total) and Knodus moenkhausii (12% of total). The two species with the largest overall biomasses were A. altiparanae (34% of total biomass) and the siluriform Hypostomus sp. (8% of total biomass). Analysis of the trophic structure of the studied ichthyofauna indicated that the 10 numerically dominant species across the 24 sampled streams can be grouped into five guilds that are in decreasing order of numerical importance: omnivores, insectivores, insectivores/invertivores, periphytivores, and algivores. Species richness in the sampled stream stretches varied from six to 20 species with an average richness of 14. The species richness estimated by extrapolation for all 24 sampled stream stretches was 67 species. The Characidae are predominant among the collected specimens with approximately 50% of both individuals and biomass, a fact hypothesized to be a function of several attributes typical of the family. Six of the 56 collected species were new to science and six other species are of indefinite taxonomic status and require further analysis in order to determine their identity. USP, FFCLRP, Dept Biol, LIRP, BR-14040901 Ribeirao Preto, Brazil Univ Estadual Paulista, IBILCE, Dept Zool & Bot, BR-15054000 Sao Jose do Rio Preto, SP, Brazil Natl Museum Nat Hist, Div Fishes, Dept Vertebrate Zool, Smithsonian Inst, Washington, DC 20560 USA Univ São Paulo, Museu Zool, BR-04299970 São Paulo, Brazil Univ Estadual Paulista, IBILCE, Dept Zool & Bot, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
Databáze: OpenAIRE
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