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Comparative Mortality Levels in Captive Animal Species: Insights and Trends

This study explores mortality levels among various species of captive animals, with a focus on data from 1998 to 2003. A total of 51 species were analyzed, examining factors influencing survivorship and life expectancy calculations, including the Gompertz function for the last 2% of life. Results indicate that certain species, such as raptors and crocodilians, exhibit better longevity at older ages, while mortality rates are lower among females in several categories. Comparisons with humans and rodents further highlight differing mortality models and demographic trends.

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Comparative Mortality Levels in Captive Animal Species: Insights and Trends

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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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