The relationship between pathogen life-history traits and metapopulation dynamics
Laura J A van Dijk1, Johan Ehrlén1, Ayco J M Tack1
1Department of Ecology, Environment and Plant Sciences, Stockholm University, SE-106 91, Stockholm, Sweden.
The New Phytologist
|January 8, 2022
Summary
Pathogen traits like spore transmission and overwintering strategies predict fungal disease spread in forest herbs. Understanding these traits helps forecast plant disease dynamics and manage outbreaks.
Area of Science:
- Ecology
- Plant Pathology
- Evolutionary Biology
Background:
- Plant pathogen life-history traits, including transmission and overwintering, influence disease dynamics but their impact on spatiotemporal patterns remains unclear.
- Understanding these influences is crucial for predicting disease spread and managing plant health.
Purpose of the Study:
- To investigate if pathogen infectivity and overwintering strategy can predict metapopulation dynamics in natural plant-pathogen systems.
- To assess the influence of host patch size and connectivity on pathogen distribution.
Main Methods:
- A multifaceted approach combining experimental assays, theoretical modeling, and field surveys.
- Focus on four fungal pathogens (rust, chytrid, smut) infecting the forest herb Anemone nemorosa.
- Analysis of pathogen patch occupancy, colonization rates, and distribution in relation to patch connectivity and size.
Main Results:
- Spore-transmitting pathogens (chytrid, smut) showed higher patch occupancy and colonization than systemic/rhizome-overwintering rust fungi.
- Rust fungi favored well-connected patches, while spore-transmitting fungi were prevalent in isolated patches.
- Larger host patch size positively correlated with occupancy and colonization for all studied pathogens.
Conclusions:
- Pathogen life-history traits, specifically transmission mode and overwintering strategy, are significant predictors of metapopulation dynamics.
- Combining experimental, theoretical, and field data offers a robust framework for predicting plant disease dynamics.
- This research provides insights for ecological and evolutionary understanding of host-pathogen interactions and disease management.
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