Populations and Competition Flashcards
What is community
Organisms of many species living in a certain area
What is population
Organisms of a particular species living in a certain area
How does the size vary in population
It depends on how many individuals leave the population and how many enter it
How do individuals leave a population
When they die or migrate to another population (emigration)
How do individuals enter a population
When they are born or when they migrate into the population from elsewhere (immigration)
How does a population increase
When the birth rate is greater than the death rate
When does a population decrease
When the death rate is greater than the birth rate
What are the factors that lead to change in population
Space
Food
Water and minerals
Predators
What is population crash
When the size of a population decreased dramatically in a relatively short period
Give some examples of population crash
Disease
Introduction of a new predator
Population and pollutions
