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. Author manuscript; available in PMC: 2012 Oct 1.
Published in final edited form as: Methods Ecol Evol. 2011 Oct 1;2(5):446–453. doi: 10.1111/j.2041-210X.2011.00095.x

Figure 1.

Figure 1

Age-specific survival for populations with identical Post-reproductive Times are shown. Populations A (red line) and B (blue dashed line) both begin reproducing at age=0, reach reproductive cessation at age=10, and both experience 50% annual mortality in years 10 and above. Population A experiences no mortality prior to reproductive cessation, while Population B experiences 20% annual mortality. 16.6% of years lived by population A are post-reproductive, compared to 4.5% of years lived by B. However, PrT for each population is one year. For both these populations the ratio of PrT to fertile lifespan is 1/10.