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Updated: Sep 20, 2025

Collecting Marine Gnathiid Isopod Fish Parasites with Light Traps
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Parasites alter interaction patterns in fish social networks.

Michael Reynolds1, Fredric Windsor1, Sarah Perkins1

  • 1School of Biosciences, Cardiff University, Cardiff CF10 3AX, UK.

Proceedings. Biological Sciences
|May 27, 2025
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Summary
This summary is machine-generated.

Parasites change social behavior, with infected guppies increasing social connections to shed parasites. Uninfected guppies showed no behavioral changes, indicating a dynamic host-parasite interaction.

Keywords:
Gyrodactylus turnbulliPoecilia reticulataectoparasiteshost–parasite networksnetwork dynamics

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Area of Science:

  • Ecology
  • Behavioral Ecology
  • Parasitology

Background:

  • Social networks are crucial for parasite transmission.
  • Host-parasite interactions are often studied as static, but behavior and infection are dynamic.
  • Limited understanding exists on how parasites alter host social networks over time.

Purpose of the Study:

  • To investigate the dynamic impact of parasites on host social network structure.
  • To determine if infected hosts alter their social behavior in response to parasitism.
  • To explore reciprocal host behavior-parasite feedback mechanisms.

Main Methods:

  • Daily monitoring of Trinidadian guppies (Poecilia reticulata) populations.
  • Observation of social network dynamics before and during infection with Gyrodactylus turnbulli.
  • Analysis of network metrics and subnetwork structures in infected and control groups.

Main Results:

  • Infected guppies significantly increased their social connections.
  • Uninfected control guppy shoals exhibited no changes in network metrics.
  • Network and subnetwork structures remained unchanged regardless of infection status.

Conclusions:

  • Parasitism actively drives changes in host social behavior and network dynamics.
  • Infected fish modify their interactions, potentially to facilitate parasite transmission or removal.
  • Reciprocal host-parasite interactions are key to understanding ecological dynamics and adaptation.