Related Experiment Video
Updated: Jun 15, 2026
11:57
Methods to Study Changes in Inherent Protein Aggregation with Age in Caenorhabditis elegans
Published on: November 26, 2017
8.6K
Meta-analysis shows no consistent evidence for senescence in ejaculate traits across animals
Krish Sanghvi1, Regina Vega-Trejo2, Shinichi Nakagawa3
1Department of Biology, University of Oxford, Oxford, UK. krishsangvi2007@gmail.com.
Nature Communications
|January 16, 2024
Summary
Male reproductive traits do not consistently decline with age across all animal species. Age-related reproductive changes vary significantly between taxa, challenging universal senescence predictions.
Area of Science:
- Reproductive Biology
- Evolutionary Biology
- Gerontology
Background:
- Male reproductive traits, including ejaculate characteristics, are often predicted to decline with age due to senescence.
- However, the universality of this age-related decline across different animal taxa remains largely unexplored.
Approach:
- A comprehensive meta-analysis was conducted on 379 studies, encompassing 157 non-human animal species.
- This analysis quantified the impact of advancing male age on various ejaculate traits.
Key Points:
- Contrary to general expectations, no consistent pattern of age-dependent decline in ejaculate traits was observed across all species studied.
- Taxon-specific differences were identified; for example, older male ray-finned fishes showed reduced sperm motility and speed, while older insects produced larger ejaculates.
- Laboratory rodents exhibited senescence in most measured ejaculate traits.
Conclusions:
- The study challenges the concept of universal reproductive senescence in males, suggesting it is not a consistent phenomenon across the animal kingdom.
- Methodological limitations and the complexity of age-related reproductive changes necessitate taxon-specific research and refined experimental designs.
