Population Ecology - Chapter 36
Population - Group of individuals of a single species that occupy the same general area.
Population
density = ___________________
Examples:
The number of oak trees per square kilometer in a forest.
–The number of earthworms per cubic meter in forest soil.
–
Dispersion patterns - Way individuals in a population are spaced within an area.
1. Clumped dispersion
individuals are...
* ____________ __________________dispersion pattern.
* Result of...
2.Uniform dispersion
individuals are...
*Result of...
3.Random dispersion
individuals in a population are spaced in an...
* _____________ ________________dispersion pattern.
Survivorship curve - A plot of the proportion of individuals alive at each age.
1.Type I
Survive to...
example: Humans, large mammals
note: Produce few offspring & provides good care.
2.Type II
Likelihood of death ____________ throughout life.
example: Lizards, rodents, birds.
3.Type III
Low survival rate for the...
Example: Oysters, invertebrates, seed plants
note: Produce large numbers of offspring, & little care.
Exponential Growth Model
 Gives an idealized picture of _________________ population growth.
 Occurs when ____________________________________________________________
 Population ______________________ every generation
 Ex. Population grows from ___________________________________________________
 Example: Bacteria, humans, rabbits
Logistic Growth Model
 Growth that occurs when there are ____________________________________________
 Limiting factors - Environmental factors that __________________________________________.
 Food, competition, space, predation
 Population will grow quickly (______________________________________________________) at
the beginning then will level off (______________________________________________________)
when the population reaches the environment’s __________________________________________
 Carrying capacity – Maximum number of individuals that an environment can support based off
the resources available (based off of the limiting factors)