Predation II - Predation II Dynamics of consumer-resource...

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6/4/11 Predation II Dynamics of consumer-resource interactions
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6/4/11 Population cycles http://wildlifemysteries.wordpress.com/2009/10/08/canad a-lynx-hunting-snowshoe-hare/ The classic case study…
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6/4/11 Population cycles What could explain such population cycles?
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6/4/11 A verbal model of predator-prey cycles *Predators eat prey and reduce their numbers *Predators go hungry and decline in number *With fewer predators, prey survive better and increase *Increasing prey populations allow predators to increase And repeat…
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6/4/11 Refuges from predation at During the 1920s biologists (motivated by the problem of crop pests) became interested in creating lab models to Didiniu m Parameci um
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6/4/11 Refuges from predation at
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6/4/11 Refuges from predation at This was a kind of success, but the persistence of the system depended on manual input of predators…. Was it possible to achieve stable pred-prey cycles?
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6/4/11 Huffaker’s experiments (I) Six-spotted m ( Eototranychu sexmaculatus Typhlodromu occidentalis Oh, darn it!!!! What could stop predators from driving prey extinct. . But also allow them to persist themselves??
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6/4/11 Huffaker’s experiments *His first experiments: Predators always wiped out the prey population and then became extinct themselves *Huffaker found that he could prolong time to extinction by providing remote areas to which the predators dispersed slowly *He went one step further and achieved coexistence of predator and prey (enlisting the help of Vaseline and clothes pegs)
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6/4/11 Huffaker’s experiments
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6/4/11 L-V predation model A simple Lotka-Volterra model predicts oscillations in abundances of predator and prey pops with predator numbers lagging behind those of their prey. 6 Let’s take a look at the model….
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6/4/11 Lotka-Volterra predator-prey Rate of change in prey population Removal of prey by predators Intrinsic growth rate of prey population = - dV dt = rV cVP - V = prey (victim); P = predator; C = capture efficiency
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Predation II - Predation II Dynamics of consumer-resource...

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