Active Forest Management Reduces Blacklegged Tick and Tick-Borne Pathogen Exposure Risk

Area of Science:

• Ecology
• Forestry
• Epidemiology

Background:

• Active forest management, such as timber harvesting, is crucial for forest health and regeneration in the northeastern USA.
• Timber harvesting influences forest ecosystems and has the potential to affect the transmission dynamics of tick-borne pathogens.
• Understanding these impacts is vital for managing forest ecosystems and public health risks.

Purpose of the Study:

• To investigate the effects of recent timber harvesting on blacklegged tick (Ixodes scapularis) density and infection prevalence.
• To determine how forest management practices influence the ecological factors affecting tick populations and pathogen transmission.
• To assess the potential of active forest management as a tool for mitigating the risk of tick-borne diseases.

Main Methods:

• A 2-year study was conducted in managed nonindustrial forests in the northeastern USA.
• Compared tick density (nymphal and adult) and small mammal capture rates in recently harvested stands versus unharvested control stands.
• Assessed understory microclimate conditions in harvested and control stands.
• A 1-year pilot study examined nymphal infection prevalence.

Main Results:

• Recent timber harvesting significantly reduced the density of nymphal and adult blacklegged ticks.
• Harvested stands exhibited microclimates less conducive to tick survival and host-seeking behavior.
• Capture rates of small mammals, key hosts for immature ticks, were lower in recently harvested areas.
• A pilot study indicated no significant effect of harvesting on nymphal infection prevalence.

Conclusions:

• Forest structure and microclimate changes resulting from timber harvesting can negatively impact blacklegged tick populations.
• Active forest management practices, specifically timber harvesting, can be a sustainable strategy to reduce the entomological risk of tick-borne pathogens.
• These findings highlight the interconnectedness of forest ecosystems, tick-borne diseases, and land management strategies.