BIO120H1 Lecture : lecture note

• School: UTSG
• Department: Biology
• Course: BIO120H1
• Professor: Ingrid L.Stefanovic

Document Summary

stable age distributionproportions of ages remain same. This is always recognized by having younger individuals and fewer older individuals. population mo metu m- population is overloaded in juvenile, so birh rates are controlled to drop population. baby boom delay in reproducion for a while and then al of a sudden, people have a lot of kids (like a pulse) age pyramids- wide base for graph- high reproduction rate, but low survival rate. fat middle in are pyramid, declining population. Slideshow 6: taking the logisitic equation and adding species to it now. basic model:lotka-volterra equation2 species competing for resources. Resources taken by one are not available for the other ( negtive relationship) one suffer, and the other doesn"t. 4 possible outcomes of l-v competitio: both stably coesxist, secies 1 wins (species 2 becomes extinct), species 2 wins, and dpends on which spies has what n.