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Figure 21.3 Rate of change in first arrival dates (days per year) of 56 bird species in Lithuania (Zuvintas Strict Nature Reserve) in 1966-1995, in relation to their average arrival dates. Regression (day 1 = 1 January): change= -0.0003xday2+0.071 xday-4.933, r2=55.2%. Negative values indicate earlier arrival. From Lehikoinen et al. (2004, based on Zalakevicius & Zaleveciute (2001).

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