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BIOL 1020 and BIOL 1021 - Lecture 18- Population Ecology-1 -
Assigned Readings in Textbook:
Chapter 46 (section 46.1) – Populations and their Properties (pages 1004 to 1007)
Chapter 46 (section 46.2) – Population Growth and Decline (pages 1007 to 1010)
Chapter 46 (section 46.3) – Age-Structured Population Growth (pages 1010 to 1015)
Use the following wireframe outline to make notes on the content presented in Lecture 18
Refer to Chapter 46 in your textbook and the Chapter 46 resources on LaunchPad to supplement
your notes and aid in studying this material
1. What is “ecology”?
The study of the relationships of organisms to one another and to the environment
- abiotic = the interactions between organisms and their non-living environments
- biotic = the interactions among organisms
2. What is the ecological hierarchy (from lowest level to highest level)?
Emergent Properties become evident as we move from one level to the next higher level!!
Biosphere ecosystem community population organism
3. What is a population?
A population consists of all the individuals of one kind (= a single species) that live and reproduce
within a given area
1
, 4. What are the 4 key characteristics of populations?
Characteristic Description
- The number of individual organisms present at a given time
- Does not indicate space occupied or involved
1 Size
- Numbers can increase, decrease, cycle or remain the same
- The number of individuals per unit area or volume
- Determining density of natural populations is possible but difficult
2 Density - Often impractical or impossible to count all individuals in a
population
- The spacial arrangement of individuals within a space
Dustribution
3
or Dispersion
Survivorship curves = gives average timing of deaths of
individuals in a population
Classified into 3 general types: Type I, Type II, and Type III
4 Demography
Age and sex distribution reveals trends in population state
Age and sex distribution reveals trends in population state
5. What 4 aspects considered in population growth?
Factor Description
= births within population
1 Natality
= deaths within population
2 Mortality
= arrival of individuals from
3 Immigration outside population
= departure of individuals
4 Emigration from population
2
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