BIO-8 Lecture Notes - Lecture 20: Isocline, Steady-State Economy, Ecological Niche
Document Summary
Interspecific (2 or more species) or intraspecific (within a species) interactions strongly influence individuals and the distribution and abundance of species. Resource competition (when a resource is limited in supply) Interference competition (direct harm to other individuals) Population growth affected by the presence of a competitor. Alpha 12 is the competition coefficient, that converts individuals of species 2 into equivalent numbers of species 1 (measures the effect of species 2 on species 1) The effect of a competitor is to: When growth goes to zero, population sizes are not changing (system goes to equilibrium) If these values are >0 then population is growing, if. Lv models predict population growth for the two species will =0 when: Zero growth isocline for s1 above zero growth isocline for s2. Anything in the bottom left corner is below both isoclines, so both populations will increase. Anything in the upper right is above both carrying capacities so both populations decrease.
