Rapport’s Rule
there is a latitudinal gradient in geographic range size
Latitudinal Diversity Gradient
species diversity is high in the tropics and declines at higher latitudes
What are the 3 types of limits for LDG hypothesis?
ecological limits, time for species accumulation, diversification rates
Traits of Tropic Oceans?
high temp - high diversity
low NPP
Traits of Temperate Oceans?
high nutrients
high NPP
What is Endemism and where do you typically find high levels of it?
tropical and mediterranean regions have high numbers of endemic species, as well as islands
LDG Hypothesis: Ecological Limits
Species richness is limited by the local ecology within each region, region a has a higher limit than region b
LDG Hypothesis: Time for Species Accumulation
Region a has been accumulating species for a longer time than region b, they have the same diversification rate
LDG Hypothesis: Diversification Rates
Region a has a higher diversification (higher speciation or lower extinction) rate than region b, they have been accumulating species for the same amount of time
