Abstract
Population size has been considered to be the primary determinant of the likelihood of extinction in many studies, providing empirical support for the minimum viable population size (MVP) theory (Shaffer 1981; Ryan and Siegfried, Chap. 2, this Vol). In many cases, however, loss of genetic heterogeneity, inbreeding depression, chance demographic events and—possible the most important factor—environmental variability play a major role in the extinction of small populations. In this chapter, however, examples for small tetraonid populations with differing persistence are summarized. In a few cases, very small populations of black grouse or capercaillie started to increase after many years of depression.KeywordsBlack GrouseSmall Home RangeHarz MountainHazel GrouseRinged BirdThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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