Distribution model of Bicknell's thrush in Quebec in SQLite (French)

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2026-09-09

The Bicknell's Thrush (Catharus bicknelli) is a bird species that is endangered in Canada and vulnerable internationally. The range of this species is one of the most restricted in North America: more than 75% of the species' numbers are believed to be found in Quebec. There are a few models for mapping Bicknell's Thrush habitat. On the other hand, the latter come from low-resolution geospatial data and, for most of them, the variation explained in the presence of the species is mainly explained by altitude and latitude and little by habitat characteristics, which makes it difficult to precisely identify places with high potential for the species. Following the arrival of lidar data, new methods for characterizing forest structure make it possible to better characterize the habitat of the Bicknell's Thrush. The distribution model, shared here, shows the probabilities of occurrence of Bicknell's Thrush using lidar data. It was calibrated with 139 occurrences (spatial accuracy of 10 m), each associated with 10 random locations in a buffer zone of 523 to 1,569 m, and then validated using an independent dataset of 3,928 listening points. This model is calibrated and validated using…

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