Summary
Distribution and size of 38 capercaillie Tetrao urogallus leks were related to amount and configuration of old forest patches in two south-east Norwegian coniferous forests. The smallest occupied patch was 48 ha containing a solitary displaying cock. All patches larger than 1 km2 contained leks. Number of cocks per lek increased with increasing patch size. Number of leks per patch increased in a step-wise manner with one lek added for each 2.5–3 km2 increase in patch size. In large patches there was one lek per 3–5 km2 old forest, and density of lekking cocks was 2–2.5 per km2. In small patches density of cocks varied considerably. Density of cocks was not related to patch isolation or patch shape. However, among leks surrounded by 50–60% old forest within a 1 km radius, number of cocks increased with increasing old forest fine-graininess. We argue that when old forests cover more than 50%, a fine-grained mosaic may support higher densities of lekking cocks than a coarse-grained mosaic. Conversely, when old forests cover less than 50%, a fine-grained mosaic is unfavourable, because each old forest patch becomes too small and isolated. Finally, we present a predictive model of how old forest fragmentation influences density of leks, number of cocks per lek, and total density of cocks.
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References
Andrén H, Angelstam P, Lindström E, Widén P (1985) Differences in predation pressure in relation to habitat fragmentation: an experiment. Oikos 45:273–277
Angelstam P (1983) Population dynamics of Tetraonids, especially the black grouse Tetrao tetrix L., in boreal forests. PhD thesis, Univ of Uppsala
Bendell JF, Elliot PW (1966) Habitat selection in blue grouse. Condor 68:431–446
Fritz RS (1979) Consequences of insular population structure: Distribution and extinction of spruce grouse populations. Oecologia (Berlin) 42:57–65
Gossow H, Pseiner K (1982) Implications of forestry management on woodland grouse conservation in Middle Europe. In: Lovel T (ed) Proc 2nd Int Symp on Grouse WPA Exning, Suffolk, pp 81–86
Gullion GW, King RT, Marshall WH (1962) Male ruffed grouse and thirty years of forest management on the Cloquet Forest Research Center, Minnesota. J Forestry 60:617–620
Hansson L (1979) On the importance of landscape heterogeneity in northern regions for the breeding population densities of homeotherms: a general hypothesis. Oikos 33:182–189
Harris LD (1984) The fragmented forest. Island biogeography theory and the preservation of biotic diversity. Univ Chicago Press, Chicago
Helle P (1984) Effects of habitat area on breeding bird communities in northeastern Finland. Ann Zool Fenn 21:421–425
Helle P (1985) Effects of forest fragmentation on bird densities in northern boreal forests. Ornis Fenn 62:35–41
Järvinen O, Kuusela K, Väisänen RA (1977) Effects of modern forestry on the numbers of breeding birds in Finland in 1945–1975. Silva Fenn 11:284–294 [In Finnish with English Summary]
Kalliola R (1966) The reduction of the area of forests in natural condition in Finland in the light of some maps based upon national forest inventories. Ann Bot Fenn 3:442–448
Larsen BB, Wegge P (1985) Habitat characteristics of territorial capercaillie cocks during the breeding season. In: Lovel T, Hudson PJ (eds) Proc 3rd Int Symp on Grouse WPA York, pp 236–246
Larsen BB, Wegge P, Storaas T (1982) Spacing behaviour of capercaillie cocks during spring and summer as determined by radio telemetry. In: Lovel T (ed) Proc 2nd Int Symp on Grouse WPA Exning, Suffolk, pp 124–130
Leopold A (1930) Environmental controls for game through modified silviculture. J Forestry 28 (3):321–326
Leopold A (1933) Game management. Charles Scribner's Sons, New York
MacArthur RH (1972) Geographical ecology: Patterns in the distribution of species. Harper & Row, New York
MacArthur RH, Wilson EO (1967) The theory of island biogeography. Princeton Univ Press, Princeton
Müller F (1974) Die wichtigsten Ergebnisse 10jähriger Auerwild-Forschung im hessischen Bergland. Allg Forstz 29 (39):834–836
Müller F (1978) Rauhfußühner als Biotop-Indikatoren. In: Hofmann RR (Red) Wildbiologische Informationen für den Jäger. Jagd+Hege Ausbildungsbuch II. Enke, Stuttgart, pp 57–68
Odum EP (1971) Fundamentals of ecology, 3rd ed. Saunders, Philadelphia
Pickett STA, Thompson JN (1978) Patch dynamics and the design of nature reserves. Biol Conserv 13:27–37
Punkari M (1984) Satellite pictures disclose the fact that: proper forest are now scarce in Finland. Suoment Luonto 43 (2):12–14, 50 [In Finnish with English summary]
Rolstad J, Wegge P (1987) Habitat characteristics of capercaillie Tetrao urogallus grounds in southeastern Norway. Holarct Ecol (in press)
Rolstad J (1984) Selection of lek habitat by capercaillie Tetrao urogallus L. in south-east Norway. Thesis, Institute of Nature Conservation, Agricultural Univ Norway
Siegel S (1956) Nonparametric statistics for the behavioral sciences. McGraw-Hill, Kogakusha, Tokyo
Sokal RR, Rohlf FJ (1981) Biometry, 2nd ed. Freeman, San Francisco
Stein J (1974) Die qualitative Beurteilung westdeutscher Auerhuhnbiotope unter besonderer Berücksichtigung der Grenzlinienwirkung. Allg Forstz 29(39):837–839
Svensson S (1978) Spelplatsinventering. In: Biologiska inventeringsnormer—fåglar. Statens naturvårdsverk Solna, Sweden, pp F24:1–7
Wegge P, Larsen BB (1987) Spacing of adult and juvenile capercaillie, Tetrao urogallus L., cocks during the breeding season. Auk (in press)
Wegge P, Rolstad J (1986) Size and spacing of capercaillie leks in relation to social behavior and habitat. Behav Ecol Sociobiol 19:401–408
Whitcomb RF, Robbins CS, Lynch JF, Whitcomb BL, Klimkiewicz MK, Bystrak D (1981) Effects of forest fragmentation of avifauna of the eastern deciduous forest. In: Burgess RL, Sharpe DM (eds) Forest island dynamics in man-dominated landscapes. Springer, New York, pp 125–206
Widén P (1985) Population ecology of the goshawk (Accipiter gentilis L.) in the boreal forest. PhD thesis, Uppsala Univ
Wiens JA (1985) Vertebrate responses to environmental patchiness in arid and semiarid ecosystems. In: Pickett STA, White PS (eds) The ecology of natural disturbance and patch dynamics. Academic Press, Orlando, pp 169–193
Winqvist T (1983) 100 tjäderspelplatser. Sveriges Skogsvårdsförbunds Tidskrift 81(2):5–25
Zackrisson O (1977) Influence of forest fires on the North Swedish boreal forest. Oikos 29:22–32
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Rolstad, J., Wegge, P. Distribution and size of capercaillie leks in relation to old forest fragmentation. Oecologia 72, 389–394 (1987). https://doi.org/10.1007/BF00377569
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DOI: https://doi.org/10.1007/BF00377569