W09_L16_Predators+and+Prey-1

W09_L16_Predators+and+Prey-1 - 1 He brought several...

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Unformatted text preview: 1 He brought several intellectual virtues to the task at hand. Instead of brushing off objections to his theory, he thought about them obsessively until he had found a solution. Showy male ornaments, like the peacocks tail, appeared hard to explain by natural selection because they seemed more of a handicap than an aid to survival. The sight of a feather in a peacocks tail, whenever I gaze at it, makes me sick, Darwin wrote. But from worrying about this problem, he developed the idea of sexual selection, that females chose males with the best ornaments, and hence elegant peacocks have the most offspring. Darwin, Ahead of His Time, Is Still Influential By NICHOLAS WADE , New York Times. Published: February 9, 2009 L16 Predators and Their Prey L16 Predators and Their Prey Feb 13, 2009 Individual Individual Interactions Interactions Intraspecific Population controls Natural selection Interspecific Interaction Interaction Types Types Interactions can Interactions can range from the range from the friendly friendly to the to the not so not so friendly friendly _ _ + + Effect of interaction on species B Effect of interaction on species A Competition Competition Amensalism Predation Commensalism/ Facilitation Mutualism Mutualism Neutral A classification table for interspecific interactions _ _ + + Effect of interaction on species B Effect of interaction on species A Competition Competition Amensalism Predation / Herbivory / Parasitism Commensalism/ Facilitation Mutualism Mutualism Neutral EXAMPLES EXAMPLES 2 _ _ + + Effect of interaction on species B Effect of interaction on species A Competition Competition Amensalism Predation Commensalism/ Facilitation Mutualism Mutualism Neutral Any sort of +/ +/- interaction: predator/prey; host/pathogen, parasitism, herbivory time N K We know that We know that intraspecific intraspecific interactions limit N interactions limit N (carrying capacity). (carrying capacity). But, so can But, so can interspecific interspecific interactions!! interactions!!...
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W09_L16_Predators+and+Prey-1 - 1 He brought several...

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