Data/hora: 13/06/2024 22:33:32

Provedor de dados: | 42
País: | Brazil
Título: | Influence of the nycthemeral cycle on the roosting behaviour of the Orange-winged Amazon
Autores: | Moura,Leiliany N. de; Silva,Maria Luisa da; Vielliard,Jacques M.E.
Data: | 2012-06-01
Ano: | 2012
Palavras-chave: | Amazona amazonica; Amazônia; Biological rhythms; Light/dark cycles; Roosting behaviour; Weather conditions.
Resumo: | 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 Ilha 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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200019
Editor: | Academia Brasileira de Ciências
Relação: | 10.1590/S0001-37652012005000029
Formato: | text/html
Fonte: | Anais da Academia Brasileira de Ciências  v.84 n.2 2012
Fonte: | info:eu-repo/semantics/openAccess