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Lecture 20

BIOL 215 Lecture 20: Competition lecture notes - Price

Course Code
BIOL 215
Neil Price

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1. Competition
Lotka-voltera mathematical model to look at competition
Two species are competing for a common resource
Reduce the carrying capacity by reducing the amount of resources in the
Carrying capacity can be set by the amount of a waste product produced
Zero population growth isoclines
Anywhere along in line, one population isn`t growing living with the other
Above the line, sp one tends to decline
Below line, sp one tends to increase
If the zero growth isoclines don`t cross, one species will inevitably
outcompete the other. Coexistence is only possible when the isoclines cross
The coexistence can be stable or unstable depending on the vector`s
direction. Small deviations might need to one species winning.
Coexistence can exist when intraspecific competition is weaker than
intraspecific competition.
n-dimensional hypervolume - so many environmental factors! Only a few
are critical to define the niche of an organism though.
For animals:
- Feeding niche
For plants:
- Temperature
- Precipitation
Fundamental niche – natural niche, without competition or predation
Realized niche – resource use in non ideal conditions
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