bio isopod lab - Stephen Kramer Cornell University Bio Lab...

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Stephen Kramer Bio Lab Cornell University The Response of Porcellio scaber in Light versus Dark Environments Abstract This experiment was performed to evaluate how Porcellio scaber isopods would react to a light stimulus. It was hypothesized that the isopods would prefer the dark, more moist, environment over the light, more dry, environment. Sixteen isopods, eight in each petri dish with moist drierite, were randomly selected. One petri dish was exposed to a 60W light bulb to create the light environment and the other petri dish was covered by black construction paper to make the dark environment. The two petri dishes were separated with a note card before performing the experiment, allowing the isopods to acclimate to the environment before commencing the experiment. The results were recorded every minute for ten minutes, counting how many isopods were in each petri dish. The isopods would all eventually end up in the dark, more moist, petri dish. The isopods would follow taxis in which as the relative humidity in the petri dish subjected to light increased, the isopods would move to the dark and moist petri dish. In each of the trials, all the isopods moved to the dark, more moist, side after the eighth minute of the experiment. In two of the trials, all of the isopods moved to the dark environment after the second minute and by the end of the fifth minute in four of the trials, all of the isopods moved to the dark environment. Introduction Isopods are terrestrial crustaceans, sometimes called sowbugs or pillbugs, and are common inhabitants of leaf litter and soil. Isopods feed on decaying organic material as
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well as algae, moss, and bark. They have a pair of compound eyes, two pairs of antennae and seven pairs of legs. Porcellio scaber (woodlice) were used in this experiment. These organisms generally follow a behavior pattern of taxis, a sequence of movements
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  • Summer '07
  • GILBERT,C.
  • Statistics, Light, Woodlouse, Spearman's rank correlation coefficient, Petri dish, Isopods

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