Populations and communities Flashcards
Population
A group of individuals the same species in the same area at the same time.
Gene pool
All of the genes in a population
Community
a composite of populations
Symbiosis
Another word for relationship
Parasitism
one organism feeds in or on host
Mutualism
Both members benefit
Commensalism
One member benefits the other is unaffected
Predator
The hunter
prey
the hunted
Natality
Birth
Mortality
Death
Immigration
Individuals moving into an area
Emigration
Individuals moving out of an area
Environmental resistance
Factors that limit population growth
Gausses’ theory of competitive exclusion
fierce competition when niches overlap, giving only one clear winner
Natural selection
Those who are more well suited to environment survie and reproduce
Succession
The orderly step by step process of a maturing ecosystem
Primary succesion
Initial development -no soil exists yet - e/g after a rock slide
Secondary Succesion
rebuilding on preexisting soil e.g after a fire
r-selected species
Small short lived organisms with a high reproductive rate
K-selected species
Large, long lived organisms with a low reproductive rate
J-curve
Exponential population growth
S-curve
Logistic growth
Carrying Capacity
is the maximum stable population size
