Biology 3445F Lecture Notes - Lecture 9: Findability, Habitat Destruction, Species Richness
Document Summary
In the science of biogeography, the island is the first unit that the mind can pick out and begin to comprehend. : macarthur & wilson 1967. Evolutionary processes work at different rates there is little or no gene flow to dilute the effects of. Endemism (the ecological state of a species being unique to a defined geographic location species selection and mutation not found anywhere else) is rampant. Originally conceived to explain the species richness on different sized islands. Neutral theory as: differences between species (traits, niches, etc. ) are ignored, underlies observed species-area relationships (sars) Sars among islands single data points from unique, different sized areas. Focus: richness is a function of the balance between immigration and extinction: more specifically: the number of species found on an island ( ) is a balance between the immigration (i) and extinction (e) rate. Immigration rate: number of new species colonizing: decreases with increasing species richness.
