lecture_notes_9_28_07

lecture_notes_9_28_07 - Lecture Notes 10-2-06 PREDATORS...

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Lecture Notes 10-2-06 PREDATORS (Kill and consume prey; generally live outside the bodies of prey) HERBIVORES (Eat, but generally do not kill, plants; generally live outside the plant body)) PARASITES (Live on the tissues of, but generally do not kill, hosts; generally smaller than and may live inside the bodies of hosts) PATHOGENS (Induce disease) Community Webs POTENTIAL OUTCOMES OF PREDATION (AND HERBIVORY) Prey and Predator Adaptations Linked Population Cycles Local Elimination of Populations Increased Diversity of Prey Animals Predators can keep densities of potential competing prey populations below the level at which they would directly compete, thus maintaining community diversity “If turf which has long been mowed be let to grow, the more vigorous plants gradually kill the less vigorous, thus out of 20 species growing in a little plot pf mown turf. 9 species persisted…” Charles Darwin TROPHIC CASCADE A chain-reaction within food webs that results from changing _population densities at
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lecture_notes_9_28_07 - Lecture Notes 10-2-06 PREDATORS...

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