Summary
The relationship between nest loss in boreal forest grouse and the fluctuations in small rodents was studied at Varaldskogen in southeast Norway during 1979–1986, covering two complete rodent cycles. Nest loss in capercaillie (N=174) and black grouse (N=81) was calculated according to Mayfield (1975) based on nests from radio-equipped hens (N=77) and nests found by other methods (N=178). Small rodent density was measured by snap trapping during spring and autumn. Losses varied as predicted by the classical alternative prey hypothesis (Hagen 1952 and Lack 1954, as elaborated by Angelstam et al. 1984): high losses during rodent crash years (85.5% capercaillie, 51% black grouse), and smaller losses during peak years (54.5% capercaillie, 32.5% black grouse). Losses were inversely related to autumn abundance of rodents in capercaillie (P<0.05), but the correlation was not significant for black grouse (0.10<P<0.20). In capercaillie, the only species with an adequate sample for analysis, no relationship was detected between spring density of rodents and nest loss. Losses during the prepeak years were nearly as high as during crash years, a result inconsistent with the model. We conclude that the numerical response of predators to their cyclic main prey (i.e. small rodents) probably play a main role during the low phase and prepeak year, whereas the dietary shift is most important during the peak and crash year of the cycle.
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Angelstam P (1983) Population dynamics of the black grouse in a boreal forest. Unpubl. PhD thesis, Uppsala University, Sweden
Angelstam P, Lindstrøm E, Widen P (1984) Role of predation in short-term population fluctuations of some birds and mammals in Fennoscandia. Oecologia 62:199–208
Christiansen E (1983) Fluctuations in some small rodent populations in Norway 1971–1979. Holarct Ecol 6:24–31
Craighead FC, Craighead JJ (1956) Hawks, owls and wildlife. Stackpole, Harrisburg, PA p 443
Hagen Y (1952) Rovfuglene og viltpleien. Gyldendal Norsk Forlag, Oslo
Hagen Y (1969) Norwegian studies on the reproduction of birds of prey an owls in relation to micro-rodent fluctuations. Fauna 22:73–126
Hørnfelt B (1978) Synchronous population fluctuations in voles, small game, owls and tularemia in northern Sweden. Oecologia 32:141–152
Lack D (1954) The natural regulation of animal numbers. Oxford Univ. Press, London
Mayfield HF (1975) Suggestions for calculating nest success. Wilson Bull 87:456–466
Myrberget S (1970) On the part played by predation in short-term variations in the population of willow grouse in Norway. Int Congr Game Biol IX:458–464
Storaas T, Wegge P (1985) High nest losses in capercaillie and black grouse in Norway. Int Symp on Grouse 3:481–498
Storaas T, Wegge P (1987) Nesting habitats and nest predation in sympatric populations of capercaillie and black grouse. J Wildl Manage 51:167–172
Storaas T, Wegge P, Sonerud G (1982) Destruction des nids de grand tetras et cycle des petits rongeurs dans l'est de la Norvege. Actes du Colloque International sur le Grand Tetras (Tetrao urogallus major). Colmar 1981, pp 166–178
Wegge P (1983) Using radio telemetry in the study of dispersal, spacing behaviour and habitat ecology of woodland grouse in south east Norway. Int Congr Game Biol XI:351–356
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Wegge, P., Storaas, T. Nest loss in capercaillie and black grouse in relation to the small rodent cycle in southeast Norway. Oecologia 82, 527–530 (1990). https://doi.org/10.1007/BF00319796
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DOI: https://doi.org/10.1007/BF00319796