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Lecture

lecture note

2 Pages
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Department
Biology
Course Code
BIO120H1
Professor
Ingrid L.Stefanovic

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BIO 120 L07(slideshow #6)
how can you predict how populations going to do with different ages?
Stable age distributionproportions of ages remain same. This is
always recognized by having younger individuals and fewer older
individuals.
Population mometum- population is overloaded in juvenile, so birh
rates are controlled to drop population.
But there is a lag (momentum)
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 doesnt.
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
experiment by gause (1930s)see slide 10!
Paramecium, some species can coexist, but sme cant
How ar competitive effects manifested in nature?
Competitive exclusio is less likely to go to competition..
Tansley experiment growth of species depends on acidic/basic soils.
Yo have to talk about environments hen you tlk about competetion
Experiment by Connell***
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Description
BIO 120 L07(slideshow #6) how can you predict how populations going to do with different ages? Stable age distributionproportions of ages remain same. This is always recognized by having younger individuals and fewer older individuals. Population mometum- population is overloaded in juvenile, so birh rates are controlled to drop population. But there is a lag (momentum) 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 equa
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