Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
28 Cards in this Set
- Front
- Back
|
What is population density |
The number of organisms in an area |
|
|
What is the equation for calculating population density |
Number of organisms/ are they take up |
|
|
What are two factors that lead to an increase in population |
Immigrants and births |
|
|
What are two factors that lead to a decrease in population |
Deaths and emigrants |
|
|
What are the 3types of dispersion |
Clumped Uniform Random |
|
|
What is clumped dispersion |
Organisms stay in packs, herds, and schools |
|
|
What is uniform dispersion |
Organisms stay equal distance from each other |
|
|
What is random dispersion |
Some organisms are close and some are far |
|
|
What is type 1 |
K selected |
|
|
What is type 3 |
R selected |
|
|
What istype 1 |
Survive to old age Humans and large mamels Produce few offspring and provide good care |
|
|
What is type 2 |
Likelihood of death constant throughout life Lizards |
|
|
Type 3 is |
Low survival rates Oysters, seed plants Produce large numbers of off spring |
|
|
What are population limiting factors |
Space, food, competition |
|
|
Define density dependent |
Factors that limit population growth when the population is dense, but not whenever it sparse |
|
|
What are some density dependent limiting factors |
Food, space, water, disease |
|
|
Define density independent limit |
Factors that limit population growth when the population is dense and whenever it is sparse |
|
|
What is an example of a density independent limit |
Food, fire, |
|
|
How are exponential and logistics growth different |
Exponential~ unregulated growth, population density does not affect it |
|
|
Define the carrying capacity that is shown in the logistic population growth model |
The population size that a habitat can support based on the amount of space, water, food |
|
|
What happens to the growth rate once it reaches the carrying capacity |
Equal 0, (equal birth/immigrants and death/emigrants |
|
|
When predator population is high |
Prey population decrease |
|
|
When predator population is low |
Prey population increases |
|
|
When prey population is high |
Predator decreases |
|
|
When prey population is low |
Predator increase |
|
|
What is a niche |
How or what the organisms actually uses in the habit |
|
|
How does a niche allow spieces to coexist |
Spieces don't fully complete with any other species |
|
|
What is a keystone species |
G |
