Biology Study

Biodiversity, Population

Biodiversity

Variety of life

Genetic diversity

Differences within a species

Species diversity

Variety of species

Ecosystem diversity

Variety of habitats

Species richness

Number of species

Species evenness

How evenly species are distributed

Keystone species

Species with a major ecosystem effect

Mechanism

How a cause creates an effect

Population

Same species in one area

Immigration

Moving in

Emigration

Moving out

Food web

Connected feeding relationships

Trophic level

Feeding position

Trophic cascade

Effects spread through a food web

Limiting factor

Restricts population growth

Carrying capacity

Max population an environment supports

Density-dependent

Stronger when crowded

Density-independent

Not dependent on crowding

Resistance

Withstand change

Resilience

Recover from change

Threshold

Point where a major shift can happen

Feedback

Change affects itself

Ecosystem shift

Lasting ecosystem change

Invasive species

Nonnative species that spreads and causes harm