Results of the GPS/GSM-tracking of Juvenile Saker Falcons in the Altai-Sayan Region

Abstract

This article represents the results of tracking by means of GPS/GSM-trackers and Argos transmitters of 17 juvenile Sakers (Falco cherrug) originated from the Altay-Sayan Ecoregion of Russia in 2002-2018. Duration of post-fledging dependence period varied from 26 to 50 days, mean 40±8.6 days, and it was considerably shorter for males (mean 32.2±4.55 days) and longer for females (mean 43.91±7.42 days): t=-3.23, p=0.006). Home ranges defined as minimum convex polygon varied from 2.5 km2 to 1,831 km2, average 430.43±606.97 km2, and was smaller for males (mean 162.87±379.84 km2) and bigger for females (mean 576.38±671.52 km2: T=1.0, p=0.05). The period when juveniles begun to disperse beyond the boundaries of natal area lasts from 23 of July to 19 of August (males dispersed 10 days earlier than females on average). The onset of migration in different years varies from 27 of July to 14 of October. The maximum linear distance from the nest to the wintering site was 1,885 km. The main losses of juvenile birds were caused by illegal trapping (41.18%). We proved a wintering of a 2CY falcons in the natal area located on the north of the breeding range (harsh climate, permanent snow cover during winter).

Keywords

• хищные птицы
• пернатые хищники
• балобан
• falco cherrug
• gps/gsm-трекер
• послегнездовой период
• распад выводков
• индивидуальные участки
• миграция
• алтае-саянский регион