Movimento longitudinal de peixes: uma análise cienciométrica, manutenção de comunidades e implicação na colonização de um riacho costeiro

Abstract

This study present a scientometric analyzese on fish movement papers published worldwide from 2000 to 2010, in order to give a brief summary of the actual research on this field. It also examines the patterns of longitudinal movement on 10 fish species in a coastal stream of the Atlantic Forest, the Ubatiba River (Márica-RJ). Addittionaly, the dispersion, distribution and density of an introduced species of fish is analyzed, regarding its impacts on the native species. The 525 articles found were obtained by search performed on the Web of Science database. We observed an increased number of publications about movements of fishes. Most of the studies were developed in the USA. The most researched ecosystems were rivers and streams, and 464 works have analyzed the movements by the marking method, where telemetry was notably the most used technique. The family Salmonidae was the target of most studies on displacement. To identify movement patterns of fish from the Ubatiba river, mark-recapture experiments were conducted in four different sampling points in the stream, between June 2011 and April 2012. A total of 1270 individuals of ten species were collected by electrofishing, identified, measured, marked with intra-dermal visible implant elastomer (VIE) and replaced in the same place where they were collected. We observed movements of short and long distance. The species that travel greater distances were A. tajasica and Characidium sp. In the rainy season, fishes tend to move more toward the upstream and go longer distances. The introduced species P. maculicauda, was first recorded on the Ubatiba river, in July 1999, in the lowest point of the sample stream, with low density. It was observed that over the years the alien species has dispersed, colonizing the highest points of the stream. Furthermore, there was a negative correlation between the densities of the alien species and the native species H. punctatus.