Vol 8 Num 3




Spatial and temporal variation in fish species diversity and composition in streams of Ivinhema River basin, upper Paraná River

Yzel Rondon Súarez

UEMS/CINAM/Laboratório de Ecologia
UEMS/CINAM/Laboratório de Ecologia. Rod. Dourados-Itahum km 12. C.E.P. 79804-970. Dourados-MS, Brazil
email: yzel@uems.br

keywords
Neotropical fish, species diversity, beta diversity, communities structure

publication date: 08-29-2008





Abstract
Aiming to describe the spatial and temporal patterns of the fish species diversity and composition in seven streams of Ivinhema basin, upper Paraná River, monthly samples were realized from January to December/2002. Forty six fish species were found, being estimated the occurrence of fifty five species in these streams. The species richness and evenness did not present seasonal variation, however, presented spatial (between streams) variations. The Similarity Analysis (ANOSIM) also suggested that only spatial variation in species composition is significant. The species richness presented significant correlation with the stream width (r=0.80) and depth (r=0.78). The evenness presented significant correlation only in mean number of collected individuals (r=-0.91). Only stream width explained significantly the distribution of main fish species in the sampled streams. Some species as H. marginatus , A. dentatus , M. sanctaefilomenae  occurred mainly in larger streams and A. fasciatus  and B. stramineus  occurred mainly in shallow streams and with high water velocity, indicating the importance of hydrological characteristics in species distribution. The physical characteristics of the streams are more important than temporal variations in fish assemblages organization of sampled streams.

how to quote this paper
Súarez, Y.R. Spatial and temporal variation in fish species diversity and composition in streams of Ivinhema River basin, upper Paraná River. Biota Neotrop.  Jul/Sep 2008 vol. 8, no. 3 https://www.biotaneotropica.org.br/v8n3/en/abstract?article+bn02308032008 ISSN 1676-0603.



Fundação de Amparo à Pesquisa do Estado de São Paulo, Fapesp
Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq
© BIOTA NEOTROPICA, 2008