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webnotes_lec17_communityecol_103007

webnotes_lec17_communityecol_103007 - Parasitism vs...

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Objectives for Community Ecology unit: Describe each type of community-level interaction Provide examples Construct models to represent multiple interactions in a community Explain how selection might act on an interaction under different circumstances Predict evolutionary outcomes for both populations resulting from selective pressure acting on the interaction
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Commensalism: + / 0 Examples: Bird nests in trees Seed dispersal by attachment to fur Examples: Damage to plants by trampling, bedding Amensalism: - / 0
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Mutualism: + / + Selection favors traits that enhance the mutualism Examples: Nitrogen-fixing bacteria ( Rhizobium ) on legume roots Animal pollinators (bees, bats, birds, butterflies, etc.) Species overlap in resource requirements AND resource is limiting Selection favors traits that reduce competition Examples: Invasive plants (garlic mustard, purple loosestrife) Competition: - / -
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Predation: + / - Selection favors different traits in predator and prey Examples: warning coloration, mimicry
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Unformatted text preview: Parasitism vs. Predation Smaller Larger Live in/on host Live outside host Usually do not kill Usually kill Multiple generations parasite may interact with1 host 1 predator interacts with individual prey Modeling Multiple Interactions • Honeybee - Colony Collapse Disorder • If time, example from book (p. 1196) - dragonflies, fish, pollinators, flowering plants Vocab List (Long) • Crossing over • Homologous chromosomes • Sister chromatids • Meiosis 1 • Gametes • Ecological community • Interspecific • Intraspecific • Amensalism • Commensalism • Competition • Mutualism • Predation • Parasitism • Selection pressure • Selective advantage • Fitness Summary of clicker and homework topics (Long): • Crossing over - consequences of location on genotype of gametes • Modeling and describing interactions in communities • Predicting population-level/evolutionary responses resulting from selection acting on various interactions...
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