an ecological foundation for ipm. island biogeography
Post on 20-Dec-2015
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An Ecological Foundation for IPM
Island Biogeography
How are Island Biogeography and Agriculture Connected?
• Give me an example
Community Succession
More DiversityMore Stability
Community Succession
Community Succession
• Planting seed
• Fertilizers
• Weeding
• Soil preparation
• Insecticides
• Artificial selection
Community Succession
R vs K-selection species
• r-selection species.
- High fecundity
- Short generation time
- Low competitive ability
- High dispersal
R vs K-selection species
• K-selection species.
- Lower fecundity
- Longer generation time
- Higher competitive ability
- Lower dispersal
R
Biodiversity and Stability
More DiversityMore Stability
The facts
Herbivores 44 149 36 58
Monophagous 17 130 31 42
Polyphagous 27 19 5 16
Predators 38 11 14 27
Parasitoids 30 1 3 6
Andow 1991
Population response to polycultureIncrease Variable responseNo changeDecrease
“Resource concentration hypothesis”Root 1973
Monoculture
Polyculture
TOO MANY VARIABLES!!!!!!!!!!!!