an ecological foundation for ipm. island biogeography
Post on 20-Dec-2015
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![Page 1: An Ecological Foundation for IPM. Island Biogeography](https://reader036.vdocument.in/reader036/viewer/2022062421/56649d425503460f94a1cc5b/html5/thumbnails/1.jpg)
An Ecological Foundation for IPM
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Island Biogeography
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How are Island Biogeography and Agriculture Connected?
• Give me an example
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Community Succession
More DiversityMore Stability
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Community Succession
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Community Succession
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• Planting seed
• Fertilizers
• Weeding
• Soil preparation
• Insecticides
• Artificial selection
Community Succession
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R vs K-selection species
• r-selection species.
- High fecundity
- Short generation time
- Low competitive ability
- High dispersal
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R vs K-selection species
• K-selection species.
- Lower fecundity
- Longer generation time
- Higher competitive ability
- Lower dispersal
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R
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Biodiversity and Stability
More DiversityMore Stability
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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
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“Resource concentration hypothesis”Root 1973
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Monoculture
Polyculture
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TOO MANY VARIABLES!!!!!!!!!!!!
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