Longitudinal distribution of the ichthyofauna in a tributary of Tietê River with sources on the Basaltic Cuestas of São Paulo, Southeastern Brazil

Rodrigo Torres Cardoso,Alexandre Kannebley De Oliveira,Julio Cesar Garavello

doi:10.1590/1676-0611-bn-2015-0005

Rodrigo Torres Cardoso, Alexandre Kannebley De Oliveira + Show 1 more

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https://doi.org/10.1590/1676-0611-bn-2015-0005

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Journal: Biota Neotropica	Publication Date: Jun 1, 2016
Citations: 1	License type: cc-by

Affiliation: Universidade Federal de São Carlos

Abstract

This work aimed to study the composition and distribution of fish species at four sites along Cabeça River, an affluent of Corumbataí River, tributary of Tietê River, intending to better understand the influence of local geomorphology on the occurrence of the species along the river. Using gill nets, trawl net, cast net and sieves, five samples were taken from each site every two months. These data were analyzed from constancy of occurrence, similarity index of Jaccard, rarefaction analysis and descriptive statistical analysis of richness. 4,532 fish individuals belonging to six different orders, 17 families and 65 species were captured. Differences in composition, richness (diversity), abundance and frequency were observed at these sites along the river. The sample site near the mouth of Cabeça River, was richer (49 species) and more abundant than the other three upstream sites, which showed fewer species and equivalent amounts each other (between 22 and 29 species). Moreover, this downstream site had the highest percentage of accessory species, whereas the other samples had a greater number of constant species. Cluster analysis from the Jaccard similarity showed that each site had distinct species composition. Cabeça River basin drains a rugged terrain in the state of São Paulo, between the Basaltic Cuestas and Peripheral Depression geomorphologic provinces. In this scenario, waterfalls and rapids influence the distribution, composition and richness of fish species.

Highlights

The Tiete River rises in the Planalto Atlantico geomorphologic province, Serra do Mar region, and drains toward interior Sao Paulo State, crossing other provinces and flowing to the Parana River in the border with Mato Grosso do Sul state
Numerous sources of Corumbataı River and part of its tributaries, such as Passa Cinco and Cabeca rivers are at the top of the Cuestas Basalticas geomorphologic province (Tavares et al, 2007), and these small rivers flow toward the geomorphologic province called Depressao Periferica, a region that lies between the Precambrian flanges of Planalto Atlantico and escarpment edges of the Cuestas Basalticas western plateau
Bennemann et al (1995), Casatti (2005) e Oliveira & Garavello (2003) found that the rivers of the upper Parana River basin regularly have a natural tendency to increase in species richness from source toward the river mouth

Summary

Introduction

The Tiete River rises in the Planalto Atlantico geomorphologic province, Serra do Mar region, and drains toward interior Sao Paulo State, crossing other provinces and flowing to the Parana River in the border with Mato Grosso do Sul state. Changes in the river channel may affect the characteristics of "continuity", for example: occurrence of rapids and falls that may restrict the movement of fish and influence the distribution of species in different portions of the drainage. Such natural barriers may generate patterns of discontinuity in the composition and distribution of ichthyofauna (Balon & Stewart, 1983)

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