Szukana fraza: [Opis = "The fluctuations of five muskrat populations in coastal northern Sweden are described over periods of 7\-14 years. The population in Sladan was studied more intensively since it colonized this area around 1963. During the last 14 years it fluctuated with a periodicity of 4 years. This time length is identical to the vole cycle length in the area."]

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