Posts Tagged ‘population’

Populations

Tuesday, January 11th, 2011

kidney beans by Dey on flickr

We are going to learn about populations and what affects them.  In particular:

  • How is population size affected by natality, mortality, immigration and emigration?
  • What does a typical population growth curve look like?
  • What are the reasons for the exponential, plateau and transitional phases?
  • What is the carrying capacity of an environment?
  • What factors limit populations from increasing indefinitely?

This is a useful presentation.  Here’s another: 5.3 Populations

And we are going to use the Lincoln Index to estimate the size of a population of kidney beans.  This is a simulation exercise, with the beans representing organisms such as woodlice.  But the beans don’t move, so are a bit more collaborative 🙂

IB Biology Lab Sheet – Lincoln Index

Ecology 101

Thursday, December 2nd, 2010

herbivore by thornypup on flickr

We are about to embark on Topic 5 so that we are ready for our field trip next semester.  Here is the syllabus guide for this section: Topic 5 – syllabus guide

This useful presentation covers the first part of the syllabus, namely Topic 5.1.  Here’s another one by Mr. Hobbins that we will use. Ecology definitions  And this is a table of the main definitions. Topic 5 – Ecology definitions

The basic concepts in this first part of ecology have to do with food chains and webs, the flow of energy through ecosystems, and the recycling of nutrients.