Primate longevity: Its place in the mammalian scheme

Area of Science:

• Comparative Mammalogy
• Evolutionary Biology
• Life History Theory

Background:

• Primate longevity is often considered exceptional within the mammalian class.
• Previous studies have suggested primates are the longest-lived mammalian order.
• Understanding life history patterns is crucial for evolutionary studies.

Purpose of the Study:

• To evaluate primate longevity in the context of general mammalian life history patterns.
• To investigate the relationship between relative brain size, organ variation, and longevity across mammals.
• To examine the evolutionary trends of longevity within primate superfamilies.

Main Methods:

• Analysis of captive longevity data from 587 mammalian species.
• Comparative analysis of absolute longevity, size-corrected longevity, and lifetime metabolic expenditure.
• Statistical examination of correlations between longevity and biological factors, including relative brain size and organ variation.

Main Results:

• Primates are not the longest-lived mammalian order by absolute, size-corrected, or metabolic measures.
• Relative brain size is correlated with longevity in primates, but this is atypical for mammals; other organs show stronger correlations.
• No progressive evolution of increased longevity was observed among primate superfamilies.

Conclusions:

• Primate longevity is not exceptionally high compared to other mammals.
• Evolutionary factors such as reduced vulnerability to environmental death, arboreal lifestyles, and sociality may explain primate longevity.
• The study challenges common assumptions about primate longevity and its evolutionary drivers.