EEMB 131 Lecture Notes - Lecture 12: Invasive Species, Competitive Exclusion Principle, Macroevolution
20 Feb 2018
School
Department
Course
Professor
Document Summary
In macroevolution, we borrow models from other aspects and apply it to the long term. In equilibrium model when n reaches k, b-d=0 dn/dt= (a-b)(n-1/k)n. If (n-1/k)n is large, then birth and death become insignificant. More individual, more competition and harder to survive. N*max is about 16% -40%=1/3 of the niches are always open. **simberloff did not introduce 854 invasive species, he just observed** 854 case histories of invasive species to observe its effect on native species. When invasive species have outcompeted the native and drive them to extinction. Invasive species doesn"t drive large amount of native species to extinction. Same as k in population biology; n*max is determined by space, food, competition. But harder to determine in evolutionary biology, need to know boundaries and limitation time equil. Model ecosystems as a grid of niches-> insert 1 or more "founder" species-> create a phylogeny in niche-space by a set of simple rules. Stable environment and resources that allow for specialization.
