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Artículo de publicación ISIAn understanding of the ecological factors determining bird species’ distributions is essential for making informedconservation decisions. These data are especially important for range-restricted species, such as the Santa Marta Bush-Tyrant (Myiotheretes pernix), a threatened endemic of the Sierra Nevada de Santa Marta (SNSM) in Colombia. Here weadopt a novel hierarchical analysis to describe the bush-tyrant’s ecological niche and infer the regional and localdeterminants of its limited distribution. We first describe habitat selection based on local habitat use and microhabitatsused for foraging. We then use a geoprocessing modeling algorithm to combine habitat selection data with a climaticniche model. The resulting model produced an index of habitat suitability, which we converted into a predictedgeographic distribution. Santa Marta Bush-Tyrants showed no clear habitat preferences, but favored forested andsecondary growth habitats over open areas, at elevations between 2,100 and 3,300 m. The species’ predicteddistribution was restricted to the northern flanks of the SNSM, with an estimated extent of ~352 km2. This estimate ismore restricted than previous estimates (570 km2), but does not alter the species’ status as Endangered based on IUCNcriteria. The model predicted that the presence of Santa Marta Bush-Tyrants was regionally dependent on cold andhumid climates, with low annual variation in temperature and precipitation. Locally, the species’ presence wasdetermined by the availability of habitat edges between forests and open areas. Conservation actions should aim toreduce rates of forest loss, while maintaining the presence of areas with good light and exposed perches, microhabitatconditions typically found in habitat edges or areas of natural disturbance. An explicit integration of quantitative dataon habitat use and foraging patterns into niche models would help to obtain more realistic and detailed projections ofthe occupied distribution of range-restricted birds

the condor

Understanding the distribution of a threatened bird at multiple levels: A hierarchical analysis of the ecological niche of the Santa Marta Bush-Tyrant (<i>Myiotheretes pernix</i>)

Understanding the distribution of a threatened bird at multiple levels: A hierarchical analysis of the ecological niche of the Santa Marta Bush-Tyrant (Myiotheretes pernix)