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)