Readings 15 notes

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University of Toronto Scarborough
Biological Sciences
Maydianne Andrade

Readings 15 Pgs. 483-502 (refer to pg485 and 489) -life history analysis is the branch of evolutionary biology that attempts to make sense of the diversity in reproductive strategies -the amount of energy an organism can harvest is finite and biological processes take time according to the laws of physics and biology -the benefit of being large is balanced by the cost of being susceptible to predators -an individual that takes time to growth risks dying without reproducing at all -whenever there is a trade off between different components of fitness, natural selection favours the individuals that allocate energy and time with an optimal balance between benefits and costs -environmental variation is undoubtedly the source of much of the life history variation seen among living organisms -differences among life histories concern differences in allocation of energy -allocating energy to different areas such as reproduction, metabolism, and repair all have trade offs -allocating energy to repair keeps tissues in better condition with the risk of having fewer offspring -allocating energy away from growth also produces fewer offspring -aging, or senescence7]Zoo] o]L]LL]L]]o[Z]o]L}]o]}Z]o -there are two theories of why aging exists N
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