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Autumn Population Size of the Capercaillie Tetrao urogallus in Relation to Weather

1979; Wiley; Volume: 10; Issue: 1 Linguagem: Inglês

10.2307/3676342

0030-5693

Tore Slagsvold, Tjostolv Grasaas,

Botany and Plant Ecology Studies

Annual fluctuations in the autumn population size of the Capercaillie Tetrao urogallus at VegArshei in South Norway, 1920-70, were analysed statistically in relation to various meteorological factors to discover short-term effects. The most important weather variables which coincided with a high population size were: an early snowmelt in spring, only a few days of rain at the time of egg-hatching at the beginning of June and only a few days of rain in July. These factors may have operated through their influence on the production of young. The results are discussed in relation to data on the species from other countries.