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Notes week 6 day 2

Notes week 6 day 2 - Life History Strategy Basic idea...

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Life History Strategy Basic idea: living things face a zero sum situation. There is a trade off between growth, survival and reproduction. o To the extent that any time, energy or effort is dedicated to those three, it comes at the expense of the other two o You can have cheap and strong but it’ll be heavy. Trade off o Different things contribute to longevity: replacing the parts as they grow out, avoiding predators. You could be really, really cautious and put a lot of effort into your immune system but still have limited offspring: there is limited stuff All else being equal = better to reproduce quickly than slowly o One individual matures in 10 years, one in 20 – over time, population becomes dominated by the fast growing individual. o All else is not equal often o When you grow slowly, you can build a more complicated machine o Advantage to more complicated machine: Bigger, no predators (external environment) More complicated machine makes that elephant more advantage – internal environment, within the species The more rapidly an individual can acquire information Life History Strategy = what contributes to different strategies when trading off reproduction and growth? o Difference between fixed strategies (characteristic of a species) and facultatively adjusted (the organism is capable of calibrating its pattern of development) o Strategies can be changeable within a species even if there are no heritable differences within an individual. If those genes have to build adaptations that are responsive to the environment, different environments will build different traits.
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