| Popis: |
1. 1. Maximum lifespan A (in years) in birds can be described by the following allometric exponential functions ( W = body mass in g ): wild birds A W = 4.75 x W 0.17 ( N = 821); captive birds A c = 5.1 × W 0.23 ( N = 131). 2. 2. The orders Lariformes, Accipitriformes, Psittaciformes and Strigiformes have physiological life spans clearly above the expected values. The orders Galliformes and Picifonnes lay clearly below the expected range. 3. 3. Different physiological times T p show allometric correlations ( N = 91) with a mean mass-exponent of 0.25; mean metabolic rate M over a broad range of systematic taxa ( N = 146), on the other hand, correlates with body mass with an exponent of −0.25. 4. 4. The product of T p × M is a mass-independent ( W 0 ). constant value, supporting the theory of an absolute metabolic scope during the life cycle. |
