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A Protocol for Laboratory Housing of Turquoise Killifish Nothobranchius furzeri
Published on: April 11, 2018
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Reproductive senescence in a short-lived fish
Jakub Žák1,2, Martin Reichard1,3
1Institute of Vertebrate Biology of the Czech Academy of Sciences, Brno, Czech Republic.
The Journal of Animal Ecology
|November 7, 2020
Summary
Reproductive senescence, the decline in reproduction with age, was studied in killifish with continuous growth. Female fecundity increased post-maturity, with senescence occurring later, challenging traditional aging trade-offs.
Area of Science:
- Evolutionary Biology
- Gerontology
- Reproductive Biology
Background:
- Reproductive senescence is typically studied in species with determinate growth, where reproduction declines after maturity.
- Organisms with post-maturity growth present a unique model for studying reproductive senescence due to conflicting life-history trade-offs.
- Limited understanding exists regarding reproductive senescence in species with extensive post-maturation growth and high adult mortality.
Purpose of the Study:
- To investigate how rapid life history and post-maturity growth influence reproductive senescence in the killifish Nothobranchius furzeri.
- To examine the interplay between chronological and biological age on reproductive parameters like fecundity, fertility, and fertilization.
- To assess sex-specific contributions to fertilization decline and explore allocation trade-offs in relation to lifespan and reproductive output.
Main Methods:
- Longitudinal study of 132 laboratory and wild-type Nothobranchius furzeri populations.
- Individual tracking of fecundity, fertility, and fertilization rates from maturity through senescence.
- Analysis of reproductive parameters in relation to chronological age, biological age, and survival rates.
Main Results:
- Female fecundity steadily increased after maturity, with reproductive senescence occurring significantly after the growth asymptote.
- The peak reproductive age in females coincided with 50% survival, suggesting senescence is linked to somatic deterioration.
- Reproductive senescence in fertilization rate was more pronounced in females than males; high early fecundity correlated with longer lifespan and later fecundity.
Conclusions:
- Nothobranchius furzeri exhibits reproductive senescence despite continuous growth, with senescence onset postponed compared to determinate growers.
- The findings challenge the assumption that post-maturity growth confers immunity to aging, highlighting the need for longitudinal data.
- Allocation trade-offs may play a lesser role in reproductive senescence for species with extended post-maturation growth and rapid life histories.
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