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Related Experiment Video

Updated: May 11, 2026

Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

Published on: September 4, 2016

Can parasites use predators to spread between primary hosts?

Joanne Cable¹, Gabrielle A Archard, Ryan S Mohammed

¹School of Biological Sciences, Cardiff University, Cardiff CF10 3AX, UK. cablej@cardiff.ac.uk

|May 30, 2013

Summary

This summary is machine-generated.

The killifish Rivulus hartii can act as a paratenic host for the guppy parasite Gyrodactylus bullatarudis, aiding parasite dispersal. This predator-prey relationship enhances parasite mobility and colonization of new aquatic environments.

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Area of Science:

Ecology
Parasitology
Evolutionary Biology

Background:

Paratenic hosts typically offer limited reproductive benefits to parasites.
However, these hosts can provide crucial advantages like enhanced mobility and dispersal.
The guppy (Poecilia reticulata) harbors ectoparasites Gyrodactylus bullatarudis and G. turnbulli, with potential interactions with predator Rivulus hartii.

Purpose of the Study:

To experimentally investigate if the killifish R. hartii can serve as an alternative paratenic host for guppy gyrodactylids.
To determine the transmission success and survival rates of G. bullatarudis and G. turnbulli on R. hartii.

Main Methods:

Experimental transmission trials of G. bullatarudis and G. turnbulli between guppies and R. hartii in both aquarium and semi-natural conditions.
Assessment of parasite survival on R. hartii, including survival out of water.

Main Results:

Gyrodactylus bullatarudis successfully transmitted from prey (guppy) to predator (R. hartii) in aquarium settings.
Both parasite species transferred to prey when the predator was infected, but G. bullatarudis transmission was more successful in semi-natural conditions.
G. bullatarudis exhibited significantly longer survival on R. hartii out of water, suggesting enhanced dispersal capabilities.

Conclusions:

Rivulus hartii functions as a paratenic host for Gyrodactylus bullatarudis, facilitating parasite dispersal between isolated guppy populations.
This predator-prey interaction enhances the parasite's ability to colonize new environments, explaining its wider distribution.
This study provides the first empirical evidence of a predator acting as a paratenic host for its prey's parasites.