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. Author manuscript; available in PMC: 2015 Oct 14.
Published in final edited form as: Evolution. 2015 Aug 24;69(9):2533–2541. doi: 10.1111/evo.12746

Figure 2.

Figure 2

Variation in the production of extra-pair offspring by females in relation to the age and territory quality of their social mate. Bubble sizes are proportional to the number of observations, which are given, and lines are from a generalized linear mixed model ± 95% confidence limits. The total sample for male age (N = 356) is slightly smaller than for territory quality (N = 361), because there were five broods for which we could not identity, and therefore age, the attendant male, but for which we were able to designate nestlings as being either extra-pair or within-pair.