Community Interactions

Community Interactions - EVPP/BIOL 350 Lecture 14 Community...

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EVPP/BIOL 350 Lecture 14 – Community Interactions Dr. Kim de Mutsert Fall 2011
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Community interactions The niche assembly model: A community is the result of interactions among species that are adapted to a particular environment Changing environments allow for relatively high diversity Community interactions and the (changing) environment the organisms adapt to shape the community structure
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Interspecific interaction Interspecific competition (- -) Predator–prey (+ -) Host–parasite (- +) Mutualism (+ +) Commensalism (+ .)
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Community interactions Responses to competition and predation shape communities as well: Strategies to avoid competition: - Habitat partitioning - Resource partitioning Strategies to avoid predation:
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Strategies to avoid predation Behavioral: Migrating to refuge habitats, e.g. diel vertical migration of zooplankton Swarming Escaping from direct attack
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Strategies to avoid predation Morphological: Armor (turtles, mollusks) Long spines Can be cyclomorphosis
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Strategies to avoid predation Life-history defenses: Body size (adult or offspring) Number of offspring Timing or duration of life-history stages
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Chemical induction of defenses Chemical signals, produced by the predator, that trigger the defense mechanisms are called kairomones
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Community Interactions - EVPP/BIOL 350 Lecture 14 Community...

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