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!!!!!!!!!!!!