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20 Cards in this Set
- Front
- Back
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Predation
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Consumption of one organism (prey) by another (predator)
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Experiment for Lotka-Voltera population cycles
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Gause's Paramecuim experiment
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Gause's Experiment
Predator? Prey? |
Didinium (predator)
Pramecium (prey) |
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3 environments in Gause's experiment
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Homogeneous
Heterogeneous Heterogeneous + Immigration |
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Didinium and Paramecium, both extinct....what environment?
why? |
Homogenous
pred ate prey fast and died due to lack of food |
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Paramecium population grew fast after Didinium extinciton...what environment?
why? |
Heterogeneous
- sediment was added for paramecium to escape, Didinuim couldnt access it to eat. |
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pred/prey population cycling due to 2 reasons
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1. Heterogenous envmnt ( refuge for prey)
2. Immigration |
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4 varieties of Prey refuges
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Space
Numbers Predator satiation Size |
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overcompensation
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growth following herbivory is greater than growth without herbivory
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Standing Biomass
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measure of how much biomass if found in a specific area at a point in time
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Primary productivity
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measure of how plant growth in a specific area for a time unit (over range of time)
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effect of geeze grazing on plant
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- reduces standing biomass
-increases primary productivity |
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Jeffery and collegeues ...herbivore/plant growth exp result
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Herbivore can increase primary productivity even if standing biomass is reduced.
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3 possible reasons why grazing increases primary productivity (benefits plant)
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1. Not all grazing with same intensity
2.Grazers defecate 3.Variable Grazing vulnerability |
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Overcompenstaion similar in idea to
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Logistic Growth model
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Logistic growth....maximal growth @?
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intermediate populations density
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Predation- what kind of interaction?
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Exploitative
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cycling in hare and lynx population due to 3 trophic levels
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1. hare
2. hare food supply 3. hare predator |
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defn.
Refuges |
to confer protection from predators
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2 types of predator responses
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1. Numerical
2. Functional |
