Seasonal variation in social organisation and diurnal activity budget of the Greater Rhea (Rhea americana) in the Argentinean pampas

We analysed seasonal variation in the size and composition of groups, and individual behaviour, of a wild population of Greater Rheas (Rhea americana) in the Argentinean pampas. We performed seasonal censuses over 8 years, and made focal observations on 59 individuals from different groups to assess...

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Autor principal: Carro, M.E
Otros Autores: Fernández, G.J
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Lenguaje:Inglés
Publicado: CSIRO 2008
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100 1 |a Carro, M.E. 
245 1 0 |a Seasonal variation in social organisation and diurnal activity budget of the Greater Rhea (Rhea americana) in the Argentinean pampas 
260 |b CSIRO  |c 2008 
270 1 0 |m Carro, M. E.; Laboratorio de Ecología Y Comportamiento Animal, Departamento de Ecología, Genética Y Evolución, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina; email: camariana@gmail.com 
506 |2 openaire  |e Política editorial 
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520 3 |a We analysed seasonal variation in the size and composition of groups, and individual behaviour, of a wild population of Greater Rheas (Rhea americana) in the Argentinean pampas. We performed seasonal censuses over 8 years, and made focal observations on 59 individuals from different groups to assess the proportion of time spent in vigilance, feeding, walking, preening or resting, and noted the number of courtship displays, copulations and aggressive interactions. Rheas were solitary or formed groups of 2-20 individuals. Mean typical group-size (TGS) over the year was 7.61 birds but varied significantly with season, TGS decreasing during the breeding season (spring), possibly owing to formation of harems. TGS of males decreased in spring whereas TGS of females did not vary seasonally. During spring, individuals spent more time vigilant and less time feeding, and were involved in many courtship interactions. Most aggression (72%) was between males and mainly occurred during winter and spring, suggesting strong intrasexual competition. Social organisation and group dynamics appear to be profoundly affected by the mating system of the Greater Rhea. © Royal Australasian Ornithologists Union 2008.  |l eng 
593 |a Laboratorio de Ecología Y Comportamiento Animal, Departamento de Ecología, Genética Y Evolución, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina 
690 1 0 |a ACTIVITY PATTERN 
690 1 0 |a AGGRESSION 
690 1 0 |a COMPETITION (ECOLOGY) 
690 1 0 |a COPULATION 
690 1 0 |a COURTSHIP 
690 1 0 |a DIURNAL ACTIVITY 
690 1 0 |a FEEDING BEHAVIOR 
690 1 0 |a GROUP SIZE 
690 1 0 |a INTRASEXUAL INTERACTION 
690 1 0 |a REPRODUCTIVE STRATEGY 
690 1 0 |a SEASONAL VARIATION 
690 1 0 |a SOCIAL ORGANIZATION 
690 1 0 |a VIGILANCE 
690 1 0 |a WILD POPULATION 
690 1 0 |a RHEA 
690 1 0 |a RHEIFORMES 
650 1 7 |2 spines  |a BIRD 
650 1 7 |2 spines  |a AVES 
651 4 |a ARGENTINA 
651 4 |a SOUTH AMERICA 
651 4 |a RHEA AMERICANA 
700 1 |a Fernández, G.J. 
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