Maternal sexual interactions affect offspring survival and ageing

Area of Science:

• Evolutionary biology
• Gerontology
• Reproductive biology

Background:

• Female exposure to increased sexual activity often reduces longevity in many species.
• Sexual conflict, where mating imposes costs on one sex, can have evolutionary implications.
• Trans-generational effects, where parental experiences influence offspring, are increasingly recognized.

Purpose of the Study:

• To investigate the trans-generational effects of maternal sexual activity on offspring mortality and longevity in Drosophila melanogaster.
• To determine if increased maternal sexual interaction leads to adverse outcomes in the next generation.
• To explore the role of sexual conflict in shaping offspring life history traits.

Main Methods:

• Drosophila melanogaster females were subjected to varying levels of sexual activity.
• Offspring mortality patterns, including survival probability and senescence rates, were analyzed.
• Mean longevities of offspring were compared based on maternal sexual treatment.

Main Results:

• Offspring from mothers with higher sexual activity exhibited reduced survival probabilities.
• Increased rates of senescence were observed in offspring of sexually active mothers.
• Mean longevities of offspring were significantly reduced following increased maternal sexual interactions.

Conclusions:

• Maternal sexual activity can impose trans-generational costs, negatively impacting offspring survival and longevity.
• Ongoing exposure to male precopulatory interactions is sufficient to induce these trans-generational effects.
• These findings highlight the complex interplay between sexual selection, aging, and trans-generational inheritance.