Why and how do termite kings and queens live so long?

Area of Science:

• Evolutionary Biology
• Gerontology
• Social Insect Ecology

Background:

• Lifespan varies significantly across species, with reproduction-longevity trade-offs being a common explanation.
• Social insect reproductives (queens, termite kings) are an exception, showing high reproductive output and extended lifespans.
• The absence of this trade-off in social insects is crucial for understanding ageing mechanisms and evolutionary dynamics.

Purpose of the Study:

• To explore the ecological and physiological factors contributing to the extended lifespans of termite reproductives.
• To discuss evolutionary and molecular mechanisms underlying the lack of a fecundity/longevity trade-off in these insects.
• To integrate current knowledge into a framework explaining the evolution of longevity in social insect reproductives.

Main Methods:

• Review and synthesis of current ecological and physiological studies on ageing in social insects.
• Analysis of evolutionary and molecular hypotheses for extended lifespans in termite reproductives.
• Integration of findings to present a coherent framework on the evolution of longevity.

Main Results:

• Termite reproductives exhibit exceptionally long lifespans despite high reproductive rates, challenging traditional ageing theories.
• Multiple evolutionary and physiological factors likely contribute to the suppression of the fecundity/longevity trade-off.
• Studies on termites provide a unique model for understanding how natural selection shapes ageing patterns.

Conclusions:

• The extended longevity of social insect reproductives offers critical insights into the fundamental mechanisms of ageing.
• Investigating these insects can elucidate the interplay between sociality, reproduction, and lifespan evolution.
• Termite reproductives serve as a valuable model for exploring the adaptive significance of ageing.