Populations
A group of organisms that belong to the same species and live in the same area
Population
An interaction between two organisms for a limiting resource
Competition
Sunlight, climate, dirt, water, and air are best examples of
Abiotic factors
The job a species has in an ecosystem is
Niche
The population in a given area is best described as
Population Density
The movement of organisms out of a population to a different area
Emigration
Plants, animals, fungi, and their remains are examples of
Biotic factors
When an organism has a larger impact on the ecosystem than other organisms.
Keystone Species
How do we calculate the population growth rate?
(Birth rate - Death rate) + (immigration - emigration)
A symbiotic relationship where both organisms benefit
Mutualism
Resources or other factors in the environment that can lower the population growth rate
limiting factors
The physical environment where a species lives
Habitat
Elephants have few young and spend a lot of time and energy caring for them. This is an example of
K-selected organisms or Type 1 survivorship
Fish-eating fish and fish-eating birds are an example of
Interspecific competition
Competition for a food sources is a
Density-dependent factor
How a populations are spread out in an area
Population Distribution
Fish and insects have many offspring and very few of them survive to adulthood. This is an example of
r-selected or type 3 survivorship curves
As the population of a prey species increases we expect a
Increase in predator population
⅔ of an island frog population was washed out to sea by the last hurricane. This is an example of a
Density-independent factors
The principle that when two species compete for the same niche one of the species will win and the other will adapt, die, or emigrate
Competitive exclusion principle