Fig. 3. Relationship between the ratios of the masses of different organs and total lean dry mass in pied flycatchers (N=10) and willow warblers (N=18) after a long-distance flight. Nutritional organs/exercise organs=lean dry mass of intestine and liver divided by lean dry mass of breast muscles and heart. In the pied flycatchers, the length of primary 8 also explained some of the variability in the ratio breast muscles/leg muscles. Regression lines are as follows: (A) y₁=–0.059+0.126x₁ (r²_adj=0.335, P=0.046); (B) y₂=8.400+2.899x₁–0.170x₂ (r²_adj=0.898, P=0.001); (C) y₁=1.130–0.349x₁ (r²_adj=0.382, P=0.003); (D) y₂=1.333+1.671x₁ (r²_adj=0.301, P=0.011), where y₁ is nutritional organs/exercise organs, y₂ is breast muscles/leg muscles, x₁ is the total lean dry mass (g) and x₂ is the length of primary 8 (mm).

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