Spatial and temporal activity patterns of Amblyomma americanum.

Area of Science:

• Entomology
• Epidemiology
• Vector-borne disease research

Background:

• Tick abundance and distribution are crucial for assessing tick-host contact risk.
• Estimating populations of actively moving ticks, like the lone star tick (Amblyomma americanum), is challenging.
• Understanding lone star tick movement and host-seeking behavior is vital for accurate risk assessment.

Purpose of the Study:

• To quantify the movement and spatial activity of adult lone star ticks.
• To determine the temporal detectability of marked lone star ticks in the environment.
• To investigate the relationship between lone star tick abundance and detection rates.

Main Methods:

• Mark-recapture studies were conducted over two years in Oklahoma using CO2-baited traps.
• Field and laboratory experiments utilized video tracking to measure tick movement distances and activity.
• Proportion of detectable ticks and relationship between abundance and detection were analyzed.

Main Results:

• Lone star ticks traveled up to 9 meters in the field and 36 meters in the laboratory within 24 hours.
• Marked ticks remained detectable for up to 14 days.
• Tick detection rates increased with population size, with fewer than half of marked ticks recovered overall.

Conclusions:

• Lone star ticks exhibit active movement, extending potential host contact risk to tens of meters.
• Despite prolonged environmental detectability, only a fraction of the tick population is detectable at any given time.
• Spatial and temporal behavior of lone star ticks must be integrated into predictive risk models for host contact.