Análisis de las relaciones jerárquicas en un grupo de Sciurus granatensis (Mammalia: Rodentia: Humboldt, 1811) en Caracas, Venezuela.
DOI:
https://doi.org/10.53157/ecotropicos.33e0019Palabras clave:
Interacciones agonísticas, Comportamiento animal, Dominancia, Identificación no invasiba, Ardilla de cola roja, Fauna urbanaResumen
Las relaciones sociales dentro de los grupos de mamíferos implican el desarrollo de relaciones jerárquicas entre sus miembros para evitar conflictos. Esta jerarquía se establece mediante encuentros diádicos agresivos. Por ello, una forma de determinar si existe una jerarquía es cuantificar las interacciones agresión-sumisión y los desplazamientos entre pares de individuos. En este trabajo se estudiaron las interacciones sociales en un grupo de Sciurus granatensis dentro de un parche de bosque urbano en la ciudad de Caracas, Venezuela, para determinar la existencia de una jerarquía de dominancia durante sus visitas a un alimentador artificial. Además, se propone el uso de un método de identificación no invasivo con base a los caracteres morfológicos de los individuos. Los individuos fueron filmados durante 19 días consecutivos, desde sus áreas de descanso hasta el comedero. Las interacciones se analizaron utilizando métodos de observación focal y de barrido; posteriormente fueron descritas en un etograma y se clasificaron en desplazamiento (intimidación vs. retirada) y agresión (ataque vs. ataque con persecución). Se identificaron 19 individuos dentro del grupo y un total de 156 (con un promedio diario de 8,2 ± 4,3) interacciones para 11 de ellos. La forma más común de interacción fue la intimidación. Se encontró que había individuos residentes y visitantes ocasionales en el grupo. La existencia de dominancia se determinó con un índice de linealidad de Landau (h = 0,636), y se observó que dos de los individuos compartían el rango jerárquico más alto. Se observó una correlación negativa significativa entre el grosor de la cola y el rango social de los individuos. Se concluyó, con base a este método de identificación no invasivo, que existe una jerarquía lineal en el grupo
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Derechos de autor 2021 Irina Santana-Castro, Cristina Sainz-Borgo (Author)

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