Population Ecology
● Population: A group of individual organisms interacting within a specific
area and environment.
● Community: An interacting group of different populations within the same
habitat.
● Species Composition: The number of different species present in an area.
● Species Diversity: Considers both the number of species and the relative
abundance of each in a given area, providing a more comprehensive view
of biodiversity.
Population Growth Models
● dN/dt = B - D: Basic equation to calculate population growth where:
○ B = birth rate
○ D = death rate
● Exponential Growth (J-shaped): Occurs under ideal conditions with
unlimited resources.
● Logistic Growth (S-shaped): Involves a lag phase followed by exponential
growth and then leveling off as it approaches carrying capacity.
Simpson’s Diversity Index
● Formula: 1−∑(n/N)21 - \sum(n/N)^21−∑(n/N)2, where:
○ n = total number of individuals of a particular species
○ N = total number of organisms of all species
● Used to measure species diversity, accounting for both richness and
evenness.
● Population: A group of individual organisms interacting within a specific
area and environment.
● Community: An interacting group of different populations within the same
habitat.
● Species Composition: The number of different species present in an area.
● Species Diversity: Considers both the number of species and the relative
abundance of each in a given area, providing a more comprehensive view
of biodiversity.
Population Growth Models
● dN/dt = B - D: Basic equation to calculate population growth where:
○ B = birth rate
○ D = death rate
● Exponential Growth (J-shaped): Occurs under ideal conditions with
unlimited resources.
● Logistic Growth (S-shaped): Involves a lag phase followed by exponential
growth and then leveling off as it approaches carrying capacity.
Simpson’s Diversity Index
● Formula: 1−∑(n/N)21 - \sum(n/N)^21−∑(n/N)2, where:
○ n = total number of individuals of a particular species
○ N = total number of organisms of all species
● Used to measure species diversity, accounting for both richness and
evenness.
