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Scale dependencies and generalism in host use shape virus prevalence.

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Spatial scale significantly impacts pathogen distribution and host interactions. Understanding disease dynamics requires considering habitat heterogeneity and host range at appropriate scales.

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Area of Science:

  • Ecology
  • Epidemiology
  • Pathogen Biology

Background:

  • Pathogen distribution and host interactions are influenced by spatial scale.
  • Biases in observation scale and type can alter interpretations of disease-diversity relationships, such as dilution or amplification effects.

Purpose of the Study:

  • To investigate the effects of spatial scale and host range on plant-virus infection prevalence and diversity relationships.
  • To determine how habitat heterogeneity influences pathogen distribution and disease dynamics.

Main Methods:

  • Combined field data from a host-pathogen community with empirical modeling.
  • Analyzed the relationship between plant-virus infection prevalence and diversity across different spatial scales.
  • Assessed the role of host range and habitat specialization in shaping disease patterns.

Main Results:

  • Prevalence-diversity relationships were found to be scale-dependent, yielding opposite effects in different habitats at sub-ecosystem scales.
  • Virus host range reflected generalism at the ecosystem scale, but plasticity indicated habitat-specific specialization.
  • Habitat heterogeneity, often overlooked at larger scales, was shown to significantly influence pathogen distributions.

Conclusions:

  • Understanding disease distributions and pathogen evolution necessitates aligning study hypotheses with appropriate spatial scales.
  • Host traits, particularly host range plasticity, are crucial for accurately predicting biotic interactions and disease dynamics.
  • Incorporating habitat heterogeneity is essential for a comprehensive understanding of pathogen spread and host-pathogen systems.