BIOB50H3 Lecture Notes - Lecture 2: Models 1, Design Of Experiments, Ribeiroia Ondatrae
8 Sep 2016
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Concept: ecologists evaluate competing hypotheses about natural systems with observations, experiments, and models: observational studies in the field. When you want to get first-hand experience. Investigator alters one or more features of the environment and observes the effect. Consists of a control group (not subject to change: controlled lab experiments. There are certain things that you can"t control: quantitative models. Testable and can be viewed as a hypothesis for what"s to happen in the future. Experiments can be done at small or large scales(often natural environments) Experimental design: replicate, assign treatments at random, set a control group ( not subject to any alterations , statistical analysis. One option is that we don"t give [fish] them anything. You want to keep everything as equal as possible except for the thing that you are testing. Case study: deformity and decline in amphibian populations. Deformities in these frogs caused by a parasite. Caused major decline of these populations (amphibians)
