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Lecture 2 Notes - includes lecture notes and relevant textbook notes

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Biological Sciences
Course Code
Marc Cadotte

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BIOB50Winter2012 Lecture 2Chapter 1 Ecology The Web of LifeAnswering Ecological Questions o Concept Ecologists evaluate competing hypotheses about natural systems with experiments observations and modelso Ecologists use several methods to answer questions about the natural world o Observational studies in the field o Experiments in the fieldlarge scale alter ecosystems or small scale o Controlled lab experiments o Quantitative models math o Experimental DesignReplicate perform each treatment more than once assign treatments at random Randomize and perform statistical analysis to determine significant effectso Experimental controls are needed and used to account for anything that may potentially affect the resultso Experiments have 3 attributes generality realism and precisionno experiment can capture all 3 o Large scale studies have generality o Field experiments have realism o And lab experiments have precision Case Study Deformity and Decline in Amphibian Populationso High incidence of deformities in amphibians leopard frogs1995 Minnesota Pollution Control Agency investigated pond and found3040 of frogs were deformedscientists worldwide tested worldwide problem of increasing deformities in amphibians not just the fr
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