Bio_1B_PPLab_Final - Biology 1B GSI Steven Kelley Section...

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Michael Hansen GSI: Steven Kelley Jennifer Wong Section 142 Jihwan Choi Eddie Lo Xin Cheng (Rachel) Predator-Prey Relations Abstract – by Jihwan Choi Introduction – by Xin Cheng (Rachel) Predation is a major ecological process, which affects individuals, populations, and communities It links various organisms within and across ecosystems. “It refers to a +/- interaction between species in which one species, the predator, kills and eats the other, the prey” (Campbell 1161). Predators search the environment for acceptable prey. Predators learn prey types and adapt to recognize prey and to avoid inedible species. In addition, predators must be able to capture prey. Adaptations to improve capture efficiency include improved motor skills and appendage modification. Finally, predators must handle prey by efficiently subduing them and detoxifying any defensive compounds. Almost all organisms on earth are potential prey for at least one other species. To escape the predation pressure, natural selection has favored individuals that are more difficult to find, capture, subdue, and consume. Adaptations against predation include coloration, behavior, morphology, phenology, and physiology. Often species having chemical defenses are also aposematic, meaning they are brightly colored in order to warn potential predators. Other species develop camouflage to avoid detection. Predation is an important process in influencing the distribution, abundance, and diversity of species in ecological communities. The population dynamics of predator-prey interactions can be modeled using the Lotka-Volterra equations, which provide a mathematical model for predator and prey populations. The purpose of this lab is to exam the relationship of predators and prey. In this lab, we first hypothesized that the bright color prey would be eliminated more quickly among the three different prey species under same conditions. Then we hypothesized that the population of the more vulnerable prey with reproductive advantage would increase faster than the less vulnerable prey. Lastly, we hypothesized that predators and prey could influence one another's population sizes over time. Materials and Methods – by Eddie Lo Materials: 1 meter stick 4 stakes and rope 3 jars of brown, green, and yellow beads Timer Calculator Methods: In our teams, we measured a 1m by 1m plot of grass and chose one person to be the predator, one to be a recorder, one to be the timer, and one to use the calculator. Exercise 1: Natural Selection for Camouflage
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This note was uploaded on 09/20/2008 for the course BIO 1B taught by Professor Carlson,mischel,power during the Spring '07 term at Berkeley.

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Bio_1B_PPLab_Final - Biology 1B GSI Steven Kelley Section...

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