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Fig. 1 | Frontiers in Zoology

Fig. 1

From: State-dependent capital and income breeding: a novel approach to evaluating individual strategies with stable isotopes

Fig. 1

Eider female lipid-free yolk δ13C values. Eider female lipid-free yolk δ13C values (N = 70) are affected by an interaction between timing of breeding and female size corrected weight. Heavy females (75th percentile, dotted line H, open circles) show a transition from utilizing mostly stored reserves (i.e., lower lipid-free yolk δ13C values) when breeding early toward an increased use of local feeding (i.e., higher lipid-free yolk δ13C values) when breeding later in the season. Light females (25th percentile, solid line L, black dots) do not exhibit an association between timing of breeding and lipid-free yolk δ13C values, but mostly utilize proteins gained from local feeding when producing the yolks for their eggs. Females of median weight (dashed line M, grey dots) exhibit an intermediate association between timing of breeding and lipid-free yolk δ13C values

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