Influencia del paisaje en el comportamiento territorial de la especie introducida Anolis sagrei (Duméril & Bibron, 1837) en ambientes urbanizados
Fecha
2019
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
Anolis sagrei es una especie de lagartija invasora que se ha introducido y reportado en el Ecuador desde el 2015, en áreas urbanizadas de la provincia del Guayas. Esta lagartija se comunica mediante cabeceos y extensiones gulares usadas durante interacciones territoriales. Estudios previos han demostrado que la cobertura vegetal y la disponibilidad de luz influencian la detectabilidad de las señales visuales. El objetivo del presente trabajo es identificar la influencia del hábitat en la comunicación visual de A. sagrei. Su hábitat fue evaluado en función de la cobertura vegetal (raíz, troncos, ramas y hojas), la disponibilidad de elementos artificiales, suelo (hojarasca), y disponibilidad de sombra en el área de percha en tres localidades de la Provincia del Guayas. Se digitalizó filmaciones de comportamiento territorial y se analizaron las exhibiciones visuales mecánicas considerando la frecuencia, amplitud, tiempo de cabeceos y extensiones gulares. Encontramos que las perchas frecuentemente utilizadas fueron ramas, troncos, raíces y que los sitios utilizados son similares entre localidades; así mismo, la comunicación visual de A. sagrei es similar entre localidades. Además, la cobertura vegetal y la disponibilidad de sombra no influyeron en los patrones de exhibición visual. Solamente, la frecuencia de extensiones gulares varía inversamente con la altura de perchamiento. Por lo tanto, se sugiere que la especie podría utilizar otras áreas naturales sin que esto afecte su comunicación.
Anolis sagrei is an invasive lizard species that has been introduced and reported in Ecuador since 2015, in urbanized areas of Guayas province. This lizard communicates through headbobs and dewlap extensions which are used during territorial interactions. Previous studies indicated that plant density and light availability influence the detectability of visual signals. The aim of this study was to identify the influence of habitat on the visual communication of A. sagrei. Its habitat was evaluated by the vegetation density (root, trunks, branches and leaves), the availability of artificial elements, soil (leaf litter), and shade availability at the perch site, in three localities of the Guayas Province. The territorial displays were recorded and digitized and the mechanical visual displays were analyzed considering frequency, amplitude, duration of headbobs and dewlap extensions. We found that the most frequently used perches were branches, trunks, roots and that the sites used by the lizards were similar across localities. Likewise, the visual communication of A. sagrei is similar in the three locations. In addition, plant cover and shade availability did not influence on visual display patterns. Only, the frequency of dewlap extensions varies inversely with the perch height. Therefore, we suggest that the species could use other natural areas without its communication been affected.
Anolis sagrei is an invasive lizard species that has been introduced and reported in Ecuador since 2015, in urbanized areas of Guayas province. This lizard communicates through headbobs and dewlap extensions which are used during territorial interactions. Previous studies indicated that plant density and light availability influence the detectability of visual signals. The aim of this study was to identify the influence of habitat on the visual communication of A. sagrei. Its habitat was evaluated by the vegetation density (root, trunks, branches and leaves), the availability of artificial elements, soil (leaf litter), and shade availability at the perch site, in three localities of the Guayas Province. The territorial displays were recorded and digitized and the mechanical visual displays were analyzed considering frequency, amplitude, duration of headbobs and dewlap extensions. We found that the most frequently used perches were branches, trunks, roots and that the sites used by the lizards were similar across localities. Likewise, the visual communication of A. sagrei is similar in the three locations. In addition, plant cover and shade availability did not influence on visual display patterns. Only, the frequency of dewlap extensions varies inversely with the perch height. Therefore, we suggest that the species could use other natural areas without its communication been affected.
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CABECEOS, COMUNICACIÓN VISUAL, EXTENSIÓN GULAR, PLASTICIDAD Y TERRITORIALIDAD