The paper analyzes prognostic models of the ornithofauna dynamics of the Northern Lower-Volga region, based on our analysis of cause and effect relationships in the dynamics of their distribution, historicofaunistic layers, and ecological groupings. As a result, abundance and distribution fluctuations have been revealed with no clear relation to the dynamics of climatic parameters but subject to certain cyclicity (Locustella fluviatilis, Motacilla citreola).
