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Type: Artigo de periódico
Title: Influence of the nycthemeral cycle on the roosting behaviour of the Orange-winged Amazon
Author: de Moura, LN
da Silva, ML
Vielliard, JME
Abstract: Environmental stimuli exert important effects on the expression of the endogenous rhythms. Daily movements of groups of parrots in response to the light/dark cycle have been studied by several researchers. However, the factors modifying the intrinsic rhythmicity of this behaviour remain little known. This study describes how the nychthemeral/circadian periodicity of roost daily movements of the Orange-winged Amazon Amazona amazonica is modified by weather factors. Numbers of parrots arriving or leaving the roosting site llha dos Papagaios were determined on a minute by minute basis. More parrots have significantly arrived at the roost after sunset than before, while more parrots have significantly left the roost before sunrise than after. The peak exodus of parrots occurred at 23 +/- 5.24 minutes before sunrise, when the average light intensity was 1 lux. The peak influx of parrots occurred at 6 +/- 6.1 minutes after sunset, when the average light intensity was 50 lux. By altering ambient light intensity, weather conditions have significantly influenced the arrival and departure times, with parrots leaving later and arriving earlier when conditions were overcast at the roost site.
Subject: Amazona amazonica
biological rhythms
light/dark cycles
roosting behaviour
weather conditions
Country: Brasil
Editor: Acad Brasileira De Ciencias
Citation: Anais Da Academia Brasileira De Ciencias. Acad Brasileira De Ciencias, v. 84, n. 2, n. 509, n. 515, 2012.
Rights: aberto
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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