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Gammarus fossarum is more susceptible to Pomphorhynchus laevis infection than Gammarus roeseli. This increased susceptibility makes G. fossarum a key host for parasite transmission.

Keywords:
Multi-host parasiteshost qualityhost specificityinfectivityprevalencetransmission

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Area of Science:

  • Ecology
  • Parasitology
  • Evolutionary Biology

Background:

  • Trophically transmitted parasites utilize multiple intermediate hosts, with varying contributions to transmission (key vs. sink hosts).
  • Gammarus fossarum and Gammarus roeseli are sympatric crustacean intermediate hosts for the acanthocephalan Pomphorhynchus laevis.
  • G. roeseli shows higher field prevalence and reduced sensitivity to parasite manipulation and predation, but host susceptibility data were lacking.

Purpose of the Study:

  • To investigate and compare the susceptibility of Gammarus fossarum and Gammarus roeseli to Pomphorhynchus laevis infection.
  • To determine the relative contributions of these two crustacean hosts to P. laevis transmission dynamics.

Main Methods:

  • Field prevalence estimates in gammarids exposed or protected from predation.
  • Laboratory infections to assess parasite transmission and host susceptibility.
  • Analysis of host susceptibility to parasite infection and behavioural manipulation.

Main Results:

  • Gammarus fossarum demonstrated significantly higher susceptibility to Pomphorhynchus laevis infection compared to G. roeseli.
  • G. fossarum is more susceptible to parasite-induced behavioural manipulation.
  • These factors collectively indicate a greater role for G. fossarum in P. laevis transmission.

Conclusions:

  • Gammarus fossarum is identified as a key host for Pomphorhynchus laevis transmission due to its higher susceptibility to infection and manipulation.
  • Understanding host-parasite interactions and differential host susceptibility is crucial for predicting parasite transmission dynamics in ecological systems.