Detection and vocalisations of three owl species (Strigiformes) in temperate rainforests of southern Chile

Norambuena, Heraldo V.
Muñoz Pedreros, Andrés
Datos de publicación:
New Zealand Journal of Zoology, Vol. 45, N°2, 121-135, 2018
Búhos - Glaucidium nana - Strix rufipes - Tyto alba - Vocalizaciones
Conspecific broadcasts are effective to increase detection of owls. To determine the most appropriate time of the year to survey owls, we played conspecific owl vocalisations monthly in a temperate rainforest of southern Chile. From 12 broadcast points surveyed we recorded detections of Glaucidium nana, Strix rufipes and Tyto alba. Glaucidium nana presented a bimodal detection curve throughout the year and we recorded two regular vocalisations in response to broadcasting: contact pair call and territorial call. Strix rufipes and T. alba both showed a peak of detection between February and May. Strix rufipes presented three vocalisations: territorial call, contact pair call and female contact pair call while T. alba uttered two vocalisations: territorial call and twittering call. We recommend surveys during the end of the breeding season (austral summer-autumn) when detection is higher in most owls. Surveys should also take into consideration the variability of the vocalisations and include covariates in monitoring to evaluate occupancy/detection models