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Updated: Oct 14, 2025

Author Spotlight: Real-Time Monitoring of Parasite Burden and Host Response
Published on: May 31, 2024
The role of host phenology for parasite transmission
Hannelore MacDonald1, Erol Akçay1, Dustin Brisson1
1Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104 USA.
Abstract:
Phenology is a fundamental determinant of species distributions, abundances, and interactions. In host-parasite interactions, host phenology can affect parasite fitness due to the temporal constraints it imposes on host contact rates. However, it remains unclear how parasite transmission is shaped by the wide range of phenological patterns observed in nature. We develop a mathematical model of the Lyme disease system to study the consequences of differential tick developmental-stage phenology for the transmission of B. burgdorferi. Incorporating seasonal tick activity can increase B. burgdorferi fitness compared to continuous tick activity but can also prevent transmission completely. B. burgdorferi fitness is greatest when the activity period of the infectious nymphal stage slightly precedes the larval activity period. Surprisingly, B. burgdorferi is eradicated if the larval activity period begins long after the end of nymphal activity due to a feedback with mouse population dynamics. These results highlight the importance of phenology, a common driver of species interactions, for the fitness of a parasite.
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