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<p>The article presents the results of our research on the population size, distribution, and characteristics of thrushes in northern Eurasia within the 1990 USSR boundaries. The study used data from the database of the Zoological Monitoring Laboratory, intermittently collected between 1880 and 2022 (mainly since 1960) during bird surveys conducted from May 16 to July 15 along routes with a total length of about 165 000&#xa0;km. Based on factor classification, we have identified six types of thrush community, the boundaries of which are correlated with climate and geographical environmental features, as well as seven subtypes of community, varying in boundaries depending on forest coverage and thermal conditions. It has been found that the density and species richness of thrush populations increased in southern and western regions, while they are absent in polar deserts and Arctic tundras. The research methodology, including cluster analysis data processing and the introduction of zero species to take into account extreme habitats, has enhanced the informativeness of the classifications. The study results can be applied in conservation activities and ecosystem health assessments.</p>

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Thrushes (Turdidae, Aves) in Northern Eurasia: Their Abundance, Distribution, and Population Characteristics

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Yu. S. Ravkin,
  • V. M. Efimov,
  • I. P. Kokorina,
  • I. N. Bogomolova

摘要

The article presents the results of our research on the population size, distribution, and characteristics of thrushes in northern Eurasia within the 1990 USSR boundaries. The study used data from the database of the Zoological Monitoring Laboratory, intermittently collected between 1880 and 2022 (mainly since 1960) during bird surveys conducted from May 16 to July 15 along routes with a total length of about 165 000 km. Based on factor classification, we have identified six types of thrush community, the boundaries of which are correlated with climate and geographical environmental features, as well as seven subtypes of community, varying in boundaries depending on forest coverage and thermal conditions. It has been found that the density and species richness of thrush populations increased in southern and western regions, while they are absent in polar deserts and Arctic tundras. The research methodology, including cluster analysis data processing and the introduction of zero species to take into account extreme habitats, has enhanced the informativeness of the classifications. The study results can be applied in conservation activities and ecosystem health assessments.