Biol 201 - Notes - 4.1.2009

Biol 201 - Notes - 4.1.2009 - Exploitation Consumer...

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Unformatted text preview: Exploitation Consumer resource interactions Population cycles in nature Lotka-Volterra theory Refuge from predation Examples:- Predator and prey o- Parasitoid (lays eggs inside of host) and host o Wasps and flies often lay eggs inside of other insects- Parasitism: lives on or in a host- Unicellular predation- Herbivory + pathogen(animals eating plants) o Opuntia: type of cactus that spread in Australia, where it did not have any natural enemies o Found a month, brought it back to Australia: short period of time and opuntia were gone Population cycles in nature Challenge of studying big predators- Long generation times- Used trapping records and saw very clear population cycles between snowshoe hate and lynx Top down regulation: a population is controlled by the trophic level above it, ie a predator or exploiter Bottom up regulation: a population is controlled by the trophic level below it, ie by resource availability...
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This note was uploaded on 09/24/2009 for the course BIOL 201 taught by Professor Mitchell during the Spring '07 term at UNC.

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Biol 201 - Notes - 4.1.2009 - Exploitation Consumer...

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