Abstract

Studies of 35-year dynamics of the number of bird species and 80-year observations of their arrival on the western macroslope of the Barguzin Ridge have been carried out. A steady decrease in the total abundance of background bird species after 1997–1998 has been revealed. Shifts and cyclic changes in the time of bird arrival have been found. Twenty-six (40.0%) out of 65 species arrived statistically significantly earlier, 7 species (10.8%) arrived later, and 32 species (49.2%) had no statistically significant timing. Correlations have been established between the timing of the first recording of migratory bird species and their local abundance and habitat distribution. Some mechanisms for the formation of the local bird population have been disclosed, including using the redistribution of species breeding density between river valleys and habitats on an altitude profile.

中文翻译：

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关键地点鸟类种群长期观测序列的形成和分析，作为研究生物多样性的方式

摘要

已经对鸟类物种数量的35年动态进行了研究，并对鸟类到达Barguzin山脊西部大坡面的80年观测进行了研究。已经发现，1997-1998年之后本底鸟类物种的总丰度稳步下降。已经发现鸟类到达时间的变化和周期性变化。在65个物种中，有26个（40.0％）到达统计学显着时间更早，有7个物种（10.8％）到达时间更晚，而32个物种（49.2％）没有统计学上的显着时间。在首次记录候鸟物种的时机与它们的本地丰度和栖息地分布之间已经建立了相关性。已经披露了一些形成本地鸟类种群的机制，