Population fluctuations in red grouse: analysis of bag records and a simulation model

摘要: (1) A time-series analysis of numbers red grouse (Lagopus lagopus) shot per annum was carried out for fifty-two moors in northern England where data were available at least 20 consecutive years during the period 1870-1977. Correlograms constructed and auto-correlation coefficients tested statistical significance. (2) In most representative sub-sample moors, 83% series had significant negative T + 2 or 3 both. mathematical model fitted to fluctuations describe their quasi-cyclic nature average 'cycle-length' found be 4.84 0.086 years. (3) Field observations from trials with captive combined construct a simulation population; its main features were: