Analysis of consortive relationships between the Siberian stone pine and the nutcracker in the Northern Urals

Abstract

The data presented have been obtained in the course of long-term stationary quantitative studies on the annual seed reproduction dynamics of Siberian stone pine (Pinus sibirica Du Tour) stands, including the abundance of seedlings, and the local population of the nutcracker (Nucifraga caryocatactes macrorhynchos C.L. Brehm) in forests of the Northern Urals. Statistically significant consortive relationships of the nutcracker population density with the yield of Siberian stone pine seeds and of the abundance of pine seedlings with the yield of seeds and the abundance of nutcrackers over preceding years have been hrevealed for the first time and formalized mathematically.