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

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.