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Viewing Fragmentation through the Disease Triangle: Implications for Pathogen Pressure on Seeds.

C D Collins1, L E Bizzari1, M H Hersh2

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Summary
This summary is machine-generated.

Landscape fragmentation alters plant disease dynamics by affecting hosts, pathogens, and environment. Patch size impacts soilborne disease, influencing seed germination and survival across diverse habitats.

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Area of Science:

  • Ecology
  • Plant Pathology
  • Conservation Biology

Background:

  • Landscape fragmentation influences plant diversity and disease dynamics.
  • The impact of fragmentation on the plant-pathogen interaction, particularly soilborne diseases, remains under-investigated.
  • Fragmentation affects hosts, pathogens, and abiotic conditions, key components of the disease triangle.

Purpose of the Study:

  • To investigate how landscape fragmentation affects soilborne plant disease pressure.
  • To understand the influence of habitat type (small patches, large patch edges, large patch interiors) on the disease triangle components.
  • To assess the consequences of fragmentation-driven disease variation on seed germination and survival.

Main Methods:

  • Field surveys of plant and fungal communities in a experimentally fragmented landscape.
  • Isolation and identification of fungi from buried seeds across different habitat types.
  • Seed germination trials with and without fungicide treatment to assess pathogen impact.

Main Results:

  • Habitat type significantly influenced plant and fungal communities, as well as abiotic factors like temperature range.
  • Extreme temperature ranges negatively impacted seed germination.
  • Fungicide application improved germination for some species, with benefits varying by habitat, indicating habitat-specific disease effects.

Conclusions:

  • Patch size alters the ecological context of plant disease by affecting all components of the disease triangle.
  • Disease impacts on seed germination are not uniform across fragmented landscapes.
  • Understanding fungal-mediated seed survival is crucial for biodiversity in fragmented ecosystems.