Back-calculated size at one year old.

Back-calculated size (in mm) adjusted for the analysis model used and expressed±the standard error. Standard errors were calculated as a function of the analysis model used, from the residuals, the variability within cohorts according to site (italic), type (italic) and the intercept (σ = 1×10−2). Interaction between sites and types were significant, results and multiple t-test comparisons are detailed in the text. N = nase, S = sofie, HyN = hybrids with nase mtDNA, HyS = hybrids with sofie mtDNA.