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

Thumbnail Image
Authors
Norambuena, Heraldo V.
Muñoz Pedreros, Andrés
Authors
Date
2019-10-17
Datos de publicación:
New Zealand Journal of Zoology, Vol. 45, N°2, 121-135, 2018
Keywords
Búhos - Glaucidium nana - Strix rufipes - Tyto alba - Vocalizaciones
Collections
Abstract
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
Description