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8-Outline Parasites

8-Outline Parasites - BSCI106 Dr Sara Via Outline 8...

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BSCI106 Outline 8 Fall 2008 p.1 Dr. Sara Via Parasite Ecology and Evolution What is parasitism? square6 Like other forms of consumption, parasitism is a +/- interaction boxshadowdwn Parasite benefits at host’s expense boxshadowdwn Unlike predation, parasite doesn’t kill host Parasites boxshadowdwn Depend on host to complete life cycle boxshadowdwn Often have complex life cycles with “intermediate hosts” boxshadowdwn Often are specialized to one or a few hosts Parasitism - Examples square6 Mistletoe boxshadowdwn Extracts nutrients and water from host plant square6 Cuckoos boxshadowdwn Brood parasites on other birds boxshadowdwn Trick birds of other species into raising their young boxshadowdwn May eject one egg Cuckoo chicks usually kill other chicks in nest. boxshadowdwn Mom keeps feeding huge cuckoo chick square6 Parasitoid wasps boxshadowdwn Lay eggs on larvae of other insects boxshadowdwn Eggs hatch and devour host boxshadowdwn Used for biological control Why is parasitism interesting? square6 Some amazing modifications for parasite lifestyle square6 An example of the Red Queen hypothesis- need to run just to Stay in the same place boxshadowdwn Parasites evolve better ways to exploit host boxshadowdwn Host evolves defense against new parasite tricks “evolutionary arms race”== coevolution
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