Changes in the fauna and distribution of birds of the forest-steppe Trans-Urals in the late XX – early XXI centuries under the influence of natural and anthropogenic factors

V.V. Tarasov

Proceedings of the Zoological Institute RAS, 2023, 327(4): 659–677 · https://doi.org/10.31610/trudyzin/2023.327.4.659

Full text

Abstract

The distribution of birds in the West Siberian plain in the western part of the forest-steppe zone (bound east by River Ishim) is very dynamic. Just since the beginning of this century, 16 new breeding species and one possibly breeding species have been discovered in this region. Most of them (76%) are representatives of the Tropical group (5 species) dispersing from the south, as well as the Nomadic (5) and the European (3) types of fauna coming from the south and the west; 3 species belong to the Chinese type of fauna and one – to the Siberian type. Another new species from the Tropical group was recorded as breeding in the last decade of the previous century. The distribution ranges of all 6 representatives of the Tropical group and 2 species of the Nomadic fauna associated with aquatic habitats have expanded northward most over the past 40 years (for 500–600 km). A powerful wave of their dispersal in forest-steppe occurred during the years of maximum filling of water reservoirs in the early 2000s. At the same time, despite the cyclical dynamics of the water level, cyclical processes in the changes of the distribution of limnophile birds are not expressed (analysis of century-long faunal lists shows the cyclical nature of the distribution of no more than 2–3 such species). It is assumed that against the background of intense climate warming most bird species, primarily limnophiles, are not simply redistributing individuals within the ranges, but are expanding their ranges northward, and that expansion will continue in the future. The anthropogenic impact on the regional avifauna is mainly caused by the consequences of the economic crisis in agriculture. In the recent decades, it has been much less obvious than the natural impact.

Key words

hydrological cycles, global warming, nesting, range boundaries, fauna dynamics, distribution

Submitted April 28, 2023 · Accepted October 3, 2023 · Published December 25, 2023

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