Lecture 18 - BIO220

Approach grow groups of either monocultures or

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online