BIOL 180 Lecture 27:02 & 04:03

When a cyclamen mite population began to increase in

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Unformatted text preview: mers can limit D J F MA they were effectively controlled in untreated plots. When a cyclamen mite population began to increase in an un treated planting, the predator population quickly mush Do The Dynamics Of Predator-Prey Interactions Cause Populations To Oscillate? - Predator and prey populations often increase and decrease in regular cycles - close synchrony. - Continue ~ unchanged for long time. ***generally driven by the prey and the amount of food available*** Ex. Lynx-snowshoe hare cycles - Basic sequence: of the cycle (there is a time lag) 1. Predators eat prey -> prey numbers drop. 2. Predators go hungry -> predator numbers drop. 3. Fewer predators -> prey numbers rise. 4. More prey -> predator numbers rise etc. - Many predator-prey interactions have response lag due to time required to produce offspring. consumers and resources for other consumers, however, and so it is also important to ask whether populations are limited primarily by what they eat or by what eats them. Studies of predator—prey interactions attempt to answer at least two fundamental questions: First, do predators reduce the size of prey populations substantially below the carrying understanding of the structure of biological communities. The second question is motivated by observations of pred ator—prey cycles in nature and directly addresses the issue of stability in natural systems. Ecologists have tried to answer these questions with a combination of observation, theory, and experimentation. KEY Snowshoe hare — Lynx 160 9 C ‘a DC 0. ‘a 0 40 0 3’ x 1850 1875 Year 1900 1925...
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