Ecosystems Flashcards
What are population shifts?
A change in the relative numbers of the different groups of individuals making up a population.
What are population trends?
Birth, death rates
Imigration, emgigration
What is speciation?
Speciation is the process by which new species form. It occurs when groups in a species become reproductively isolated and diverge.
Types of speciation
Sympatric Speciation caused by behavioural changes.
Allopatric Speciation caused by geographical isolation.
What is a scale?
A metric that describes the spatial and temporal dimensions of an object, pattern, or process
What is a species?
A group of organisms that can reproduce naturally with one another and create fertile offspring.
Communities
A group of species that are commonly found together
Niches
The role an organism plays in a community. If this role is not fulfilled then tropic cascade will occur. If 2 animals fill the same role then they will compete.
What is a deme?
A subdivison of a population consisting of closely related plants or animals.
Breeding within the group
What is a drought?
A place has less precipitation (rain or snow) than normal over a few months or even longer.
What is famine?
Famine is a widespread scarcity of food,
