Thermodynamics of trematode infectivity

Area of Science:

• Parasitology
• Thermodynamics
• Climate Change Biology

Background:

• Temperature is a critical environmental factor influencing organismal biology and is closely tied to climate change.
• Parasite establishment, specifically trematodes, can be affected by temperature-induced changes in parasite infectivity and host susceptibility.
• Predictive models of host-parasite dynamics under climate change necessitate large-scale analyses of thermal influences.

Purpose of the Study:

• To analyze the thermodynamics of larval trematode infectivity across different life stages (miracidia, cercariae, metacercariae).
• To quantify temperature-driven reaction rates using the Arrhenius critical incremental energy of activation (E*).
• To understand how temperature influences the infectivity of various trematode larval stages.

Main Methods:

• Literature review of experimental data on trematode infectivity.
• Application of the Arrhenius critical incremental energy of activation (E*) to assess temperature-dependent reaction rates.
• Analysis of thermal response curves for miracidia, cercariae, and metacercariae infectivity.

Main Results:

• Miracidial and cercarial infectivity increase with rising temperatures, exhibiting an optimal thermal range before declining at higher temperatures.
• Metacercarial infectivity demonstrates an inverse relationship with temperature, being highest at low temperatures and decreasing as temperatures rise.
• The study quantifies distinct thermal optima and thresholds for different trematode larval stages.

Conclusions:

• Temperature exerts differential effects on the infectivity of trematode larval stages.
• Understanding these thermal dynamics is essential for predicting trematode-host interactions under changing climate conditions.
• The findings provide a thermodynamic basis for modeling parasite establishment and distribution in response to global warming.