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(a) Density of black grouse in four Finnish game districts 1964–2003. KS; Keski-Suomi, KY; Kymi, OU; Oulu, VS; Varsinais-Suomi. The population under study is KS. (b) Relationship between mean maximum daily temperature during the last three weeks in April and mean copulation date. (c) Mean maximum daily temperature of the last three April weeks from 1964 to 2003.
