Table 3. Regression statistics of the exponential decay functions in δ¹³C of different tissues from female mallards after the switch from C4 to C3-based diet.

Tissue	a	λ	δ(∞)	R2	n
Plasma	6.32±0.37	0.162±0.033	−24.31±0.25	0.94	13
Blood cells	7.60±1.37	0.022±0.007	−26.1±1.41	0.95	26
Albumen	5.31±0.29	0.218±0.041	−22.98±0.21	0.97	13
Yolk – mean	6.02±0.38	0.116±0.020	−23.27±0.36	0.98	13
inner yolk	7.58±2.62	0.052±0.033	−25.12±2.73	0.90	13
intermediate yolk	6.23±0.59	0.128±0.034	−23.22±0.53	0.94	13
outer yolk	5.73±0.27	0.222±0.034	−22.80±0.18	0.98	13

Exponential decay is given with δ(t) = δ(∞)+a•e^{−λ• t} wherein δ(t) is the isotope signature of the specific tissue at time t (days) since diet switch, δ(∞) is the isotopic composition of the tissues in equilibrium with the new C3-diet, a is the difference between δ(0) and δ(∞), and λ is the turn-over rate. R² and n are goodness of fit and the number of samples; coefficients are given as means ± SE.