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vol.12 issue1Disentangling the influences of habitat structure and limnological predictors on stream fish communities of a coastal basin, southeastern Brazil author indexsubject indexarticles search
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Neotropical Ichthyology

Print version ISSN 1679-6225On-line version ISSN 1982-0224

Abstract

MANNA, Luisa Resende; REZENDE, Carla Ferreira  and  MAZZONI, Rosana. Habitat use by Astyanax taeniatus (Jenyns, 1842) (Characiformes: Characidae) in a coastal stream from Southeast Brazil. Neotrop. ichthyol. [online]. 2014, vol.12, n.1, pp.187-192. ISSN 1679-6225.  http://dx.doi.org/10.1590/S1679-62252014000100020.

The habitat use of a stream-dwelling Astyanax taeniatus from the State of Rio de Janeiro was investigated. We performed 12 h of underwater observation in a 200 m long stretch in the upper Roncador stream and quantified the following microhabitat descriptors: (i) water velocity, (ii) distance from the stream bank, (iii) substratum, and (iv) water column depth. Microhabitat selectivity was analyzed by comparing the microhabitat used by fish and the microhabitat available in the study site as well as by applying the Ivlev Electivity Index to the microhabitat use data. Differences in the use and availability of the various microhabitats revealed non-stochastic patterns of spatial occupation by A. taeniatus, which was selective for two of the four analyzed microhabitats. Our findings indicated that A. taeniatusis associated with habitats that have higher depths, low water velocity, and sand and bedrock substratum.

Keywords : Snorkeling; Micro-habitat; Rain Forest; Non-stochastic use; Environmental resources.

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