Pathogens in multispecies host communities

Outline

Stereotypical disease ecology study

Yet most pathogens infect multiple host species

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What are the effects of host species diversity on pathogens?

Outline

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Five ways diversity can decrease disease

S: susceptible host regulation

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Foliar fungal pathogens

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What other mechanisms could explain results?

maybe: encounter (contact) reduction

But, little support for encounter reduction in crops

Summary

Outline

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Pathogens with multiple hosts

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Greater risk of emergence across hosts:

Plant viruses – Power & Flecker 2003 chapter

Cereal & barley yellow dwarf viruses

Virus detection by ELISA

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monocultures

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An earlier experiment with Avena

quadcultures (2003)

Summary

Outline

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Apparent competition

Summary

Outline

Predators – Ostfeld & Holt 2004

The healthy herds hypothesis

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Infection can depend on resistance (and tolerance) to other consumers

Summary

Outline