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Dehydration does not drive host behavioural manipulation by hairworms.
Louise M Coates1, Kieran Reynolds1, Mara Carey-Wood1
1Department of Life Sciences, University of Bath, Bath, United Kingdom.
Plos One
|September 23, 2025
Summary
Nematomorph parasites manipulate host behavior to reach water. This study found dehydration is not the primary driver, though both infected and dehydrated crickets seek water.
Area of Science:
- Parasitology
- Animal Behavior
- Proteomics
Background:
- Nematomorphs are parasitic worms that manipulate arthropod hosts to enter water for reproduction.
- The mechanism behind this host behavior manipulation is poorly understood.
- Previous hypotheses include light attraction, erratic movement, and dehydration.
Purpose of the Study:
- To investigate the 'Dehydration Hypothesis' for nematomorph-induced host behavior.
- To compare the water-seeking behavior of infected and dehydrated house crickets.
- To identify proteomic changes in cricket hemolymph due to infection and dehydration.
Main Methods:
- Experimental dehydration of house crickets (Acheta domesticus).
- Behavioral observation of water interaction in infected and dehydrated crickets.
- Quantitative mass spectrometry of cricket hemolymph proteomes.
Main Results:
- Both infected and dehydrated crickets showed increased water interaction compared to controls.
- Dehydrated crickets preferred head submersion, while infected crickets fully entered water.
- Proteomic analysis revealed distinct protein signatures for infection and dehydration, with changes in vitellogenin, α-amylase, and hemocyanin.
Conclusions:
- Dehydration is unlikely to be the sole or primary mechanism driving nematomorph-induced host behavior.
- Both infection and dehydration increase host water interaction.
- The study provides novel insights into the proteomic responses to nematomorph infection in crickets.
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