BIO220H1 Lecture Notes - Lecture 25: Display Size, Mortality Rate, Antagonistic Pleiotropy Hypothesis

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3 Apr 2020
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March 31st 2020
BIO220 LEC0101
BIO220 Lecture 25: Aging
Aging/senescence
- Declining somatic function
- Reduction in fertility and survivorship
- Proximate cause: progressive degeneration of the soma
Manifestation of aging
- Degeneration of the soma impaired function (sight, strength, speed, etc…),
or increased disease (organ failure, cancer …)
- As we get older, our mortality rate also increases
Evolutionary mystery of aging proximate theory
- Oxidative processes in our body damage our tissues and cells
- Vitamins E and C can protect us from those damages, and should reduce the
process of aging
- We also have the ability to produce antitoxins and repair the oxidative
process thus reduce aging
- So why don’t we produce more of it? Some constraints?
Trade-offs in the evolution of all traits
1) Display size (morphological traits)
2) Foraging rate (behavioural trait)
3) Longevity, aging (life history trait)
Through DNA repair
- Benefit longevity, long life
- Cost decrease fecundity
- High reproductive rate can accelerate senescence and thus shortens
individual’s life span.
Reproductive costs in water striders
- Hypothesis high reproductive rate will accelerate senescence (thus
die earlier)
- Reproductive rate in water striders is dependent on food resources, more
food = more offspring
- Measure: numbers of eggs, quality of eggs, life span of parent
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