Lecture 18 - BIO220

Approach grow groups of either monocultures or

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Unformatted text preview: ch: Grow groups of either monocultures or polycultures of plants • Monoculture: only 1 genotype present. – Repeated for 8 separate genotypes. • Polyculture: Mixtures of either 4 genotypes or 8 genotypes 5 -Do different genotypes have different characteristics? -If more diverse plants support more diverse insects as well, there will be rippling e ffects upwards on predators etc. • Measure: – Number (& id) of herbivores – Number (& id) of omnivores – Number (& id) of predators • Tests: – Do more diverse plots contain greater richness or diversity of species? – Mechanism: Is this due to sampling, or interactions among gentoypes? 6 -Monoculture: 1 Genotype -Polyculture: Either 4 or 8 Genotypes -If you have only 1 genotype present, you must make sure that your results are due to the fact t hat there is only one genotype there, not some intrinsic feature that is unique to that g enotype -We make 8 monocultures so that we can get accurate results that are not representative of ONE abhorrent genotype -This could be a pure sampling effect: If you recruit more and more genotypes you are more l ikely to include some genotype with unique features that will make them more/less attractive -Other possibility: interactions among genotypes. Certain genotypes grown together either work well or antagonistically (in terms of the effects that they have on the community) 1 19/03/2013 Experiment performed at UofT’s Koffler Scientific Reserve For more photos, info on field courses, and research...
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