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Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans

Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans

Published on: May 18, 2022

Sex differences in nutrient-dependent reproductive ageing.

Alexei A Maklakov¹, Matthew D Hall, Stephen J Simpson

¹Evolution & Ecology Research Centre and School of Biological, Earth and Environmental Sciences, The University of New South Wales, Kensington, Sydney 2052, NSW, Australia. a.maklakov@unsw.edu.au

|July 25, 2009

Summary

This summary is machine-generated.

Male and female crickets show distinct reproductive aging patterns. Female fecundity declines with age, while male sexual signals improve, highlighting sexual selection

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Published on: October 13, 2018

Area of Science:

Evolutionary biology
Gerontology
Animal behavior

Background:

Evolutionary theories predict age-related decline in fitness traits due to decreasing selection strength.
Sexual selection theory suggests male reproductive performance, particularly sexual advertisement, may increase with age.
Diet is hypothesized to influence age-dependent reproductive performance in both sexes.

Purpose of the Study:

To investigate sex-specific age-dependent reproductive performance trajectories in the cricket Teleogryllus commodus.
To determine the influence of diet on reproductive aging patterns.
To compare the roles of sexual selection and age-dependent mortality in shaping reproductive senescence.

Main Methods:

Comparative analysis of reproductive performance (fecundity and sexual advertisement) across the lifespan of male and female crickets.
Experimental manipulation of diet to assess its impact on age-related reproductive changes.
Observation of reproductive aging patterns in Teleogryllus commodus under controlled conditions.

Main Results:

Females exhibited peak fecundity early in adulthood, followed by a decline.
Male sexual advertisement continuously increased throughout their natural lifespan, declining only after the maximum field lifespan.
These distinct sex differences in reproductive aging persisted despite variations in sex-specific dietary conditions.

Conclusions:

The study reveals significant, qualitative differences in reproductive aging between male and female crickets.
Sexual selection appears to be a powerful driver of male reproductive signaling, potentially outweighing age-related declines.
These findings underscore the importance of sexual selection in shaping the evolution of reproductive senescence, comparable to sex-dependent mortality.