BIO220H1 Lecture Notes - Lecture 25: Display Size, Mortality Rate, Antagonistic Pleiotropy Hypothesis
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Proximate cause: progressive degeneration of the soma. 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. 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. Trade-offs in the evolution of all traits: display size (morphological traits, foraging rate (behavioural trait, longevity, aging (life history trait) High reproductive rate can accelerate senescence and thus shortens individual"s life span. 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. When you increase their reproduction rate, longevity of the individual is decreased by half.
