Important Vocab Flashcards
Density dependant factor
A factor that depends on the population size
Example: decreased food supply, land supply
Inbreeding
breed from closely related people or animals, especially over many generations.
Dispersion
How far away the populations of a species are from each other
Life expectancy
How long an organism is expected to live
Immigration
When an organism comes into a new country
Emigration
When an organism leaves a country
Birth rate
The numbers of births a population has over a certain time period
Agricultural Revolution
When the farming industry started to grow
Hunter-Gatherer Lifestyle
When a organism lives off the lay of the land and uses up all available resources then leaves to do the same to another area( A nomad kind of)
Death Rate
The number of deaths a population has over a certain time period
Population Density
How dense a population is - number of people per square foot or mile
Growth Rate
The number of Births minus the number of deaths divided by the people coming in and leaving
Ecological Succesion
The observed process of change in the species structure of an ecological community over time. The time scale can be decades (for example, after a wildfire), or even millions of years after a mass extinction.
Primary Succesion
When a glacier runs down a a hill with dirt
Population
The number of people in a community or area
Density-Independant Factor
A factor that doesn’t matter how large the population is
Example: Wildfire or Storm
Climax community
The community that has the most people in a city or state
Pioneer species
A species that isn’t native to the area their habitats in but were brought over form Another country to control a native species
Disturbance
When their is a disturbance in the population caused by high growth death or birth rates
Secondary Succesion
When their is no dirt in a land area because of farmland
Stability
How stable the environment is to sustain life
