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• W2078342114 abstract "Scottish Rock Ptarmigan (Lagopus mutus) showed unstable population dynamics, with density-dependent features differing between areas on rich and poor soils. The study was conducted on arctic–alpine land on four submassifs, three of nutrient-poor granite and one of richer schist. Ptarmigan numbers cycled with a period usually of ∼10 yr, but sometimes 6 yr. Delayed density dependence was detected in populations on granite submassifs, but not on schist, despite significant cyclicity there. Spring densities and the number of young reared per brood were higher on schist than on granite. Population change from one spring to the next was related to intervening breeding success on both granite and schist, but to summer loss only on granite. The same factors that determined variations in clutch size among years also largely affected breeding success. Population change, breeding success, summer loss, and clutch size showed delayed density dependence on granite, but not on schist, where numbers fluctuated more erratically. On granite, but not schist, early plant growth was followed by larger clutches, breeding success was related to June air temperature, and June temperature tended to peak 1–2 yr before ptarmigan peaks. Cyclic June temperature may have entrained the timing of ptarmigan cycles on granite. Results on both schist and granite were inconsistent with expectations from predator–prey hypotheses for cycles. In years of rising numbers, hens laid more eggs and reared more chicks per extra egg laid than in years of decline, and the proportion of surviving young recruited into the spring population was probably greater. Our hypothesis is that Scottish Rock Ptarmigan show unstable dynamics, driven by intrinsic positive feedback between recruitment in one year and the next, regulated by negative feedback between recruitment and density, and modified by the physical factors of weather and soil fertility that affect female nutrition and breeding success." @default.
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• W2078342114 date "1998-06-01" @default.
• W2078342114 modified "2023-10-14" @default.
• W2078342114 title "POPULATION DYNAMICS OF SCOTTISH ROCK PTARMIGAN CYCLES" @default.
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• W2078342114 doi "https://doi.org/10.1890/0012-9658(1998)079[1174:pdosrp]2.0.co;2" @default.
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