Longitudinal segregation of Astyanax janeiroensis in Rio Ubatiba: a Neotropical stream of south-east Brazil

Authors: Mazzoni, R.¹; Schubart, S. A.¹; Iglesias-Rios, R.²

Source: Ecology of Freshwater Fish, Volume 13, Number 3, September 2004 , pp. 231-234(4)

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Abstract:

Mazzoni R, Schubart SA, Iglesias-Rios R. Longitudinal segregation of Astyanax janeiroensis in Rio Ubatiba: a Neotropical stream of south-east Brazil.

Ecology of Freshwater Fish 2004: 13: 231-234. © Blackwell Munksgaard, 2004 Abstract -

In this study, we explored patterns of size and abundance of Astyanax janeiroensis in Rio Ubatiba (Rio de Janeiro, south-east Brazil) in relation to reproduction. A. janeiroensis broadcast their eggs in the water column throughout the year. Samples at seven sites conducted every second month from July 1994 to August 1995 revealed a predominance of larger adult specimens upstream and immature juveniles downstream. We hypothesize that upstream movements of adult individuals is a response to drifting of eggs and larvae.

Keywords: migration; reproduction; stream; Serra do Mar

Document Type: Short communication

DOI: http://dx.doi.org/10.1111/j.1600-0633.2004.00062.x

Affiliations: 1: Departamento de Ecologia, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro 2: Departamento de Ecologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil

Publication date: 2004-09-01