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Lecture 27 - Lecture 26 27 1 Age Specific Birth Rates...

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Lecture 26 + 27 1) Age Specific Birth Rates – Multiply the initial amount by death rate and so on. a) Reproductive rates vary among age classes b) Age structure population tree – Italy has a relatively uniform. U.S. is also relatively stable, has a bulge with the Baby Boomers. Afghanistan, however, has a rapid tapering, which shows a high birth rate and a high death rate. 2) Ideal organism would reproduce as soon as it was born, would produce infinite offspring, and live infinitely – this would be most beneficial to the species, but obviously this is not biologically plausible. a) Organisms must make trade-offs – Reproduction vs. Survivorship (A deer can allocate fat to a newborn fawn, or save the fat to survive through the winter). b) Reed Deer study in Rhum, Scotland – Similar to finch study in that the population is isolated on an island. Reproductive females at any age class have a higher mortality rate than non-reproductive females. c) Another study where they altered the brood sizes of birds – by removing birds, altering the nest, or increasing birds. The birds in large brood sizes must spend more energy to feed the birds in the nest and do not allocate resources for themselves to survive.
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