Abstract
The winter roost of the long-eared owl Asio otus in Crimea (South of Ukraine), located in Simferopol, is described. In 2015–2017, the number of long-eared owls varied on a convex curve, with the maximum reached at the end of November and in December. The birds exhibited a strong preference for roosting in conifers, where we recorded 89% of the owls. There was an inverse relationship between the mean of the maximum daily temperature (°C) and the number of owls in both seasons. The owls were not sensitive to abrupt but short-term temperature changes, but the temperature decrease curve caused practically synchronous changes in the dynamics of bird numbers. It was found that the number of owls significantly differed based on weather conditions in 16 trees. The proportion of owls sitting on coniferous trees increased with unfavourable weather, and the converse pattern was observed for deciduous trees.
Highlights
The long-eared owl (Asio otus) is widespread species, migratory in the northern part of its range, and sedentary in the south and west
Period, the the number number of of long-eared long-eared owls owls changed changed on convex curve, curve, with with the the maximum occurring from the end of November to the middle of According to maximum occurring from the end of November to the middle of December (Figure 2)
Accordingthe to literature, the maximum number of long-eared owls was in December in Milan, in
Summary
The long-eared owl (Asio otus) is widespread species, migratory in the northern part of its range, and sedentary in the south and west. In winter, it forms communal roosts [1]. Relatively little work has been carried out on other aspects of the biology of this species, such as the phenology of winter roost occupancy and behaviour at the roost [9]. This ecology aspect has not been studied in Ukraine
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