9 Flashcards
Alpha diversity?
of species or diversity within a local habitat
Beta diversity?
Change in the species composition between localities across space or environmental gradient (proportion of shared species across sites).
Gamma diversity?
of species or diversity within a larger region; a function of both alpha and beta diversity.
Equation of beta diversity?
Gamma diversity - alpha diversity
If alpha diversity =~ gamma diversity?
Low beta diversity
If alpha diversity < gamma diversity?
High beta diversity
One way to calculate beta diversity?
Gamma - mean (alpha diversity across all the sites)
Species turnover?
Beta diversity that is measured along the axis of variation in the environment (e.g. abiotic gradient)
Edge points?
The peripheral of a study site
If you have high overlap between different compositions, how will that affect beta diversity?
Beta diversity will be lowered.
The higher the species turnover, the ______ beta diversity?
Higher
Factors that contribute to species diversity in order of levels?
Global scale -> Geographic barriers to dispersal (regional scale) -> Habitat partitioning within ecoregions (landscape scale) -> microhabitat niche partitioning (e.g. understory vs canopy) (local scale) -> biotic interactions
Spatial scales can tell us in terms of species diversity?
The patterns of species diversity and the abiotic factors that limits their range.
If there is a limit in species richness in the global scale, then the limit must apply to?
Local scales
Local species richness can be determined by what type of niche?
Realized niche