1 Species Abundance And Diversity Flashcards
Defined as an assemblage of species living close enough together for potential interaction
Community
They differ in species richness, the no. of species they contain, and the relative abundance of different species
Community
A unit of nature and the focus of study in ecology
Ecosystem
Consist of all the biotic and abiotic factors in an area and their interactions
Ecosystem
Ecosystem components
- Niche
- Habitats
- Competitive Exclusion Principle
The sum of a species use of the biotic and abiotic resources in its environment
Ecological niche
Ecological role in the community — how it fits into an ecosystem
Niche
The physical environment to which and organism has become adapted and survives in
Habitat
Can occur when species compete for a specific limiting resource
Interspecific competition
Strong competition can lead to the local elimination of one of the two competing species
Competitive Exclusion
States that two species with similar needs for the same limiting resources cannot coexist in the same place.
Competitive Exclusion Principle
is the differentiation of niche that enables two similar species to coexist in the community
Resource Partitioning
community attributes:
- Number of species
- Relative abundance of species
- Nature of species interactions (food webs)
- Physical structure
Of a community is the variety of different kinds of organisms that make up the community
Species diversity
Species diversity 2 components
- Species richness
- Relative abundance
The total number of different species in the community.
Species richness
Of the different species is the proportion each species represents of the total individual in the community
Relative abundance
Is the tendency of a community to reach and maintaining a relatively constant composition of species despite disturbance.
Stability
Proposes that communities constantly change following a disturbance
Non Equilibrium Model
An event that changes a community by removing organisms or altering resource availability.
Disturbance
suggests that moderate levels of disturbance can create conditions that foster greater species diversity than low or high levels of disturbances
Intermediate Disturbance Hypothesis
