Lecture 7 Flashcards
How do predators influence a community
they reduce herbivor populations which can lead to plant growth
Species in a guild
Share a resource
Species in a functional group
process resources in a similar manner Fix n2
Plants into three groups
Competitors
Ruderals
Stress tolerators
Competitors (plants)
Monopolize resources
Ruderals (plants
Disturbed environments Invest in reproduction
Stress- tolerators
Difficult environments - Long lived , Conserve resources
Diversity is influenced by
Species richness and species evenness
Alpha Diversity
Diversity within a community
Beta Diversity
Between-habitat diversity (uniqueness of species
Gamma Diversity
Landscape diversity
Keystone Species
Have a disproportionately large effect on community structure relative to abundance
Foundational species
have stronger role in community based on their numbers.
Competitive exclusion
One out competes the other
Competitive release
A species can spread out when competitor eliminated.
Exploitation Competition
When two species grow together the carrying capacity is reduced for both species, compared to pure populations
Fundamental niche
Full range of environmental tolerances
Realized niche
range of tolerance restricted by other species
Intermediate Disturbance Hypothesis (IDH)
Species richness is the highest at intermediate levels on disturbance
High levels of disturbance
many species fail to get established
Low disturbance
competitively superior species suppress others
Resource control or bottom up
Consumer abundance determined by food limitation
Consumer control or top down
Abundance of species limited by consumers
