Figure 2.

Parent–offspring regressions of early life telomere length (TL) in great reed warblers; (a) between mother and sons (17 mothers, 31 broods and 56 sons), (b) between mother and daughters (17 mothers, 31 broods and 43 daughters), (c) between father and sons (19 fathers, 36 broods and 65 sons) and (d) between father and daughters (19 fathers, 36 broods and 47 daughters). Some of the individuals produced offspring in more than 1 year (almost always with different partners), and we therefore pooled data for all the offspring that belonged to the same mother or father, respectively, to calculate mean offspring telomere length for each parent.