A replaceable soma enables negative senescence in harvester ants.
Abstract
Most vertebrates and insects undergo senescence: as they age, their rate of mortality increases while reproduction declines. We present data from a 34-y study on 3,285 colonies of known age in the western harvester ant,
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Research summary
The paper demonstrates that the replacement of the queen ant's body (soma) by her workers effectively resets her biological age, allowing her to live indefinitely and reproduce without senescence. This is a landmark finding in evolutionary biology and aging research because it provides a natural, empirical example of "negative senescence" and biological rejuvenation, directly challenging the universal assumption that aging is an inevitable, irreversible process in complex multicellular organisms.
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