Deconstructing host quality offers insight into disease ecology.

Area of Science:

• Disease ecology
• Host-parasite interactions
• Community ecology

Background:

• Disease risk varies across ecological communities due to differences in host quality, defined as a host's contribution to parasite fitness.
• Existing terminology for host quality lacks harmonization across plant and animal research domains.

Purpose of the Study:

• To propose a unified, four-component framework for host quality that integrates plant and animal research.
• To elucidate the relationship between host defense strategies (resistance and tolerance) and specific components of host quality.
• To provide a foundation for analyzing parasite generalism/specialism and disease dynamics in multi-parasite systems.

Main Methods:

• Development of a conceptual framework for host quality.
• Analysis of host defense strategies (resistance and tolerance) within the proposed framework.
• Exploration of implications for parasite community structure and disease risk.

Main Results:

• The proposed four-component framework harmonizes host quality terminology across domains.
• Host resistance and tolerance are shown to relate to distinct components of host quality.
• The framework facilitates analysis of the specialist-generalist parasite continuum.

Conclusions:

• Formalizing host quality components synthesizes disease ecology across disciplines.
• This framework enhances understanding of biodiversity-disease risk relationships.
• The framework offers new avenues for studying host-parasite dynamics and disease management.