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Gabriel Luz Wallau Franchesco Della-Flora Anderson Saldanha Bueno Josmael Corso Mauro Freitas Ortiz Nilton Carlos Cáceres 《Acta ethologica》2010,13(2):127-135
This study presents data on behavioural acts performed by the Common Moorhen Gallinula chloropus in southern Brazil, and compares these with the behaviours previously reported for other populations. Focal observations
of individuals were conducted in the municipality of Santa Maria, in the central region of the state of Rio Grande do Sul,
Brazil. The sampling was done in 2-hour sessions, between January and March of 2007. A total of 20 behavioural acts, grouped
in seven categories, were identified and described: locomotion (N = 5 acts), grooming (N = 4), intra-specific behaviour (N = 2), inter-specific behaviour (N = 3), foraging (N = 2), reproduction (N = 2) and rest (N = 2). Among the observed behaviours were acts that are not described in the literature such as greeting of offspring and
some feeding acts. Regarding the use of habitat, we observed that this species has a preference for water or aquatic macrophytes,
which is contrary to other reports. In the analysis of behavioural daily variation, overall behavioural categories did not
vary significantly throughout the day, whereas we observed a significant difference in the use of categories during the periods
11:00 am–1:00 pm, 1:00–3:00 pm and 5:00–7:00 pm. The contrasting data between studies indicate that the variation between
habitats and ecological interactions may generate different selective pressures on the behaviour of G. chloropus. 相似文献
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Michele Santa Catarina Brodt Franchesco Della-Flora Nilton Cáceres 《Acta ethologica》2014,17(3):181-185
Blue Manakin Chiroxiphia caudata (Pipridae) has a lek mating system in which males cooperate in teams of two or more individuals for courtship displays to females. Males ascend through a dominance hierarchy to assume the rank of alpha male. Only alpha males copulate with females. In this study, we describe the ascension of a male to the alpha rank following the disappearance of the previous alpha male. The study was conducted in the seasonal Atlantic Forest of Southern Brazil. We observed nine banded males at two adjacent leks. The gamma male at the more successful lek also acted as an alpha male at a less successful lek 314 m away. Upon the disappearance of the alpha male at the more successful lek, the gamma gave up his alpha rank at the less successful lek and ascended to the alpha rank at the more successful lek, bypassing the beta male. Although a previous study suggests a strictly linear dominance hierarchy in C. caudata, with beta male ascending to alpha status, our results suggest that the rising to become the alpha male may be a more flexible and dynamic process than previously reported. 相似文献
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