EAS100 Lecture 27: 27 - Evolution.txt

• School: University of Alberta
• Department: Earth and Atmospheric Sciences
• Course: EAS100
• Professor: Jeffrey Kavanaugh

Document Summary

1. 5 million described species (not necissarily the number alive now) 3 - 30 million species currently living on earth. 12 kinds of finch, specific to single islands. Two species that have exactly the same requirements cannot coexist in the same habitat. A niche represents the set of enviromental conditions under which a population of individuals of a given species can persist. Fundamental and realized niches if a can exist in niche |aaaaaaaaaa | and b can exist in niche | bbbbbbbbbb | Often, larvea and adults do not compete for resources. Natural section: inheritance of traits from previous generation, variation in those traits, survival and reproductive success rates that vary with the enviroment.