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Using Multivariate Analyses to Explore Host-Pathogen Coevolution in Complex Trait Space.

Rachel M Ruden1,2, Amberleigh E Henschen1,3,4, Marissa M Langager5

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Summary
This summary is machine-generated.

Wildlife populations may evolve disease tolerance, favoring pathologies that enhance host competence without reducing fitness. This study on House Finches and Mycoplasma gallisepticum reveals complex host-pathogen interactions beyond simple lesion severity scores.

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Coevolutioncommunity analysismultivariate trait spacepathologyshape analysis

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Wildlife Disease Ecology

Background:

  • Lesion severity scores are commonly used to track wildlife disease, but can oversimplify complex host-pathogen interactions.
  • Understanding coevolutionary dynamics requires analyzing the full spectrum of pathological responses.

Purpose of the Study:

  • To investigate coevolutionary patterns in House Finches (Haemorhous mexicanus) infected with Mycoplasma gallisepticum using multivariate analyses.
  • To compare disease progression in House Finches from populations with different histories of pathogen exposure.

Main Methods:

  • Applied shape and community analyses to study House Finches experimentally infected with Mycoplasma gallisepticum isolates of varying virulence.
  • Compared disease responses between a long-exposed Virginia population and a pathogen-naïve Hawaii population.

Main Results:

  • Virginia House Finches exhibited milder overall disease progression compared to Hawaii birds.
  • Pathogen isolates induced different pathological community structures, with high-virulence isolates leading to depauperate communities in Virginia birds.
  • Eversion was common in Virginia birds with high-virulence Mycoplasma gallisepticum, suggesting selection for pathologies that don't compromise fitness.

Conclusions:

  • Multivariate analysis reveals nuanced host-pathogen interactions masked by simple lesion severity scores.
  • Wildlife populations may evolve disease tolerance, favoring specific pathologies that enhance host competence.
  • Findings highlight the importance of considering complex pathological traits in host-pathogen coevolutionary studies.