Please use this identifier to cite or link to this item:
Title: Diel variation of larval fish abundance in the Amazon and Rio Negro
Authors: Araújo-Lima, Carlos Alberto Rego Monteiro
Silva, V. V. da
Petry, Paulo
Oliveira, Eurides de
Moura, S. M.L.
Keywords: Fresh Water
Circadian Rhythm
Population Density
Circadian Rhythm
Fresh Water
Population Density
Issue Date: 2001
metadata.dc.publisher.journal: Revista Brasileira de Biologia
metadata.dc.relation.ispartof: Volume 61, Número 3, Pags. 357-362
Abstract: Many streams and large rivers present higher ichthyoplankton densities at night. However, in some rivers this does not occur and larvae are equally abundant during the day. Larval drift diel variation is an important information for planning sampling programs for evaluating larval distribution and production. The aim of this study was to test whether the abundance of larval fish was different at either period. We tested it by comparing day and night densities of characiform, clupeiform and siluriform larvae during five years in the Amazon and one year in Rio Negro. We found that larvae of three species of characiform and larvae of siluriform were equally abundant during day and night in the Amazon. Conversely, the catch of Pellona spp. larvae was significantly higher during the day. In Rio Negro, however, larval abundance was higher during the night. These results imply that day samplings estimate adequately the abundance of these characiform and siluriform larvae in the Amazon, but not Pellona larvae. Evaluations of larved densities of Rio Negro will have to consider night sampling.
metadata.dc.identifier.doi: 10.1590/S1519-69842001000300003
Appears in Collections:Artigos

Files in This Item:
File Description SizeFormat 
artigo-inpa.pdf355,19 kBAdobe PDFThumbnail

This item is licensed under a Creative Commons License Creative Commons