2.5 Population Ecology Flashcards
(28 cards)
Define Ecology
Scientific study of interactions. Organisms versus organisms, organisms versus environment.
What are the levels of Ecological Studies?
- Organismal Ecology
- Population Ecology
- Community Ecology
- Ecosystem Ecology
- Landscape Ecology
What is Organismal Ecology?
Interaction between individual organism and the environment.
What is Population Ecology?
Interactions WITHIN a population.
What is Community Ecology?
Interactions between DIFFERENT populations.
What is Ecosystem Ecology?
Interactions between communities and abiotic components.
What is Landscape Ecology?
Interaction between ecosystems.
Habitat
Were an organism lives.
Niche
Functioning role of organism within habitat.
Native Species
Species occurring naturally in an area.
Non-Native Species
Intentionally or accidentally introduced into an unnatural environment.
Invasive Species
Non-native that causes harm.
Indicator Species (Bioindicators)
Species that are sensitive to environmental change.
Keystone Species
Species that play a critical role in maintaining a community.
Population Size
Number of individuals present.
Population Density
Number of individuals per one unit of area.
Population Distribution (Dispersion)
Special arrangement of organisms.
Random Population Distribution
Resources are widespread thereby not turning arrangement.
Uniform Population Distribution
Territorial, competition.
Clumped Population Distribution
Arrangement dependent on resources.
Sex Ratios
Proportion of females versus males.
Age Structure (Distribution)
Relative number of individuals in each age group.
Calculating Population Growth
How do you find the rate of natural increase?
Natural increase = birth rate - death rate
Calculating Population Growth
How do you find the population growth rate?
Population Growth Rate = (Births - Deaths) + (Immigration - Emigration)
Expressed in numbers per 1000 individuals per year
