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

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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. d)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/09/2012 for the course BIOL 104 taught by Professor Smith during the Spring '09 term at Arkansas State.

Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online