Figure 2. Age-dependent terminal declines in reproductive output.

Age-specific relative reproductive output in relation to whether a reproductive attempt was the last (“Terminal”, right panel), or not (“Non-terminal”, left panel). Relative reproductive output is the number of fledglings produced by a female minus the averaged reproduction of all females in a given year. Data are means and standard errors. Sample sizes are given for each age class. The solid lines are the model predicted regression slopes from the final model from table 2a. The late-life decline in reproductive output was steeper during terminal reproductive attempts (see table 3a).