What specific substrate is crucial for the preferred habitat of I. pacificus?
Significant leaf litter accumulation
The Western Blacklegged Tick has a strong ecological dependency on substantial accumulations of leaf litter found on the forest floor. This material is essential because it helps maintain the high humidity levels that are non-negotiable for the survival of the tick, particularly the vulnerable larval and nymphal stages. The leaf litter acts as a protective layer, moderating temperature fluctuations and conserving essential moisture throughout the year. Habitats like coastal scrub, dense chaparral, and woodlands are ideal precisely because they naturally facilitate the buildup of this critical layer, contrasting sharply with drier or heavily sun-exposed areas where established populations decline significantly.
