Species Richness

Species Diversity

Simpson's Index (D)

D=1-sump(i)

Why are there more species in the tropics than in any other area on earth?

Time Hypothesis

Climate Hypothesis

Area Hypothesis

Competition Hypothesis

Predation Hypothesis

Field Experiment of Predator Mediated Coexistence

Observational Field Study of Disturbance Mediated Coexistence Example 1

Intermediate Disturbance Hypothesis Graph

Observational Field Study of Disturbance Mediated Coexistence Example #2

Experimental Field Study of Disturbance Mediated Coexistence