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HIGH AGE MORTALITY – OTHER SPECIES

HIGH AGE MORTALITY – OTHER SPECIES. JULY 2014. STEVE BALE. OTHER SPECIES. Comparative mortality levels among selected species of captive animals Kohler et al, 2006. 51 species investigated for mortality 1998 - 2003

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HIGH AGE MORTALITY – OTHER SPECIES

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  1. HIGH AGE MORTALITY – OTHER SPECIES JULY 2014 STEVE BALE

  2. OTHER SPECIES

  3. Comparative mortality levels among selected species of captive animalsKohler et al, 2006 • 51 species investigated for mortality 1998 - 2003 • Data issues include: birth date recording, survival recording, small numbers at very old ages • Survivorship and Life Expectancy calculations • Gompertz function applied for last 2% of lives

  4. Comparative mortality levels among selected species of captive animalsKohler et al , 2006 • Raptors / Crocodilians exhibiting level LEs at older ages • Other species exhibiting declining LEs at older ages

  5. Comparative mortality levels among selected species of captive animalsKohler et al , 2006 • 30% - 40% lower mortality for females for 4 of the 8 categories

  6. Bio demography of Old-Age Mortality in Humans and RodentsGavrilova & Gavrilov, 2014 • Comparison of three species • US males / female YOB 1890 - 1900 • Mice • Rats • All three species have mortality that is better fitted by Gompertz than Kannisto mortality deceleration models

  7. EXTINCT GENERATION

  8. Approach • Applied to cohorts YOB 1875 – 1900 (age 100 1975 - 2000) • For a given cohort aged x in calendar year y, the following formula is used: • Population for age x in calendar year y = P x, y • Deaths for age x in calendar year y = D x, y • P 109, y = D 109, y • P x, y = P x+1, y+1 + D x, y • q x, y = D x, y / P x, y

  9. Features / Assumptions

  10. Results – YOB 1875 - 1900

  11. E&W – death registration YOB 1875 - 1900

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