Macroparasite dynamics of migratory host populations

Area of Science:

• Ecology
• Epidemiology
• Mathematical Biology

Background:

• Wildlife disease dynamics are influenced by spatial host density variations.
• Understanding parasitism in migratory species is limited due to complex spatiotemporal density changes.
• Few spatially explicit models exist for host-macroparasite interactions.

Purpose of the Study:

• To develop a spatially explicit model for host-macroparasite dynamics incorporating host movement.
• To investigate the effects of parasite burden on host mortality and migratory ability.
• To explore feedback mechanisms between parasitism and host migration patterns.

Main Methods:

• Developed a model for host-macroparasite dynamics considering directional host movement.
• Included spatiotemporal changes in mean and variance of parasite burden per host.
• Incorporated parasite-mediated host mortality and reduced migratory ability.

Main Results:

• Heavily parasitized hosts exhibit reduced migratory ability, potentially halting migration.
• Stationary hosts accumulate higher parasite burdens than mobile hosts.
• Simulations indicate positive feedback loops leading to parasite-induced migratory stalling at infection hotspots.

Conclusions:

• The model highlights how parasite-host interactions can drive disease dynamics in migratory wildlife.
• Parasite-induced migratory stalling can create localized 'hotspots' of high parasite burden.
• This framework aids in understanding global change impacts on wildlife migration and disease.