Agonistic behavior of breeding purple gallinules Porphyrula martinica: potential ecological correlates
Palabras clave:
rice field, aggression, competition, resource defense, economic defense, fightResumen
Purple gallinules Porphyrula martinica are territorial birds that breed in natural ponds with abundant aquatic vegetation as well as in rice fields. Observations of the aggressive behavior during the breeding season conducted on a rice field and on a naturally flooded savanna (estero), in the Central Llanos of Venezuela, showed that purple gallinules exhibit three types of agonistic behaviors towards conspecifics: replacements, chases and fights. Replacements are brief interactions involving two individuals in which one bird flies or walks toward another, with the result of the later moving away. Chases are pursues on vegetation or during flight, and fights are strong interactions involving mutual pecking and kicking. Fights were significantly longer in duration that replacements and chases in both sites but they were shorter in the rice field than in the natural pond. Replacements and chases were more frequent than fights in both breeding sites. Average overall interaction frequency (all types of aggressive interactions) was lower in the rice field than in the natural pond (0.83 and 2.04 h-1 respectively). Differences detected between sites do not mirror encounter probability because this was probably higher in the rice field than in the natural pond, as estimated from bird density in both sites (rice field: 31 ± 2.1 bird/ha, natural pond: 11.5 ± 0.9 bird/ha). Differences in frequency and duration among the three types of aggressive behaviors and between sites suggest some ecological correlates of aggression in breeding purple gallinules that must be analyzed.
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Derechos de autor 2003 Zaida Tárano (Author)
Esta obra está bajo una licencia internacional Creative Commons Atribución 4.0.
