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A parasitic nematode invasion in Trinidad altered fish communities. The presence of guppies amplified parasite effects, doubling infection and mortality rates in killifish, demonstrating parasite impacts on community structure.

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Area of Science:

  • Ecology
  • Parasitology
  • Community Ecology

Background:

  • Parasites can significantly alter host community structure and dynamics.
  • Understanding parasite impacts requires disentangling direct host effects from indirect community interactions.
  • Previous research has not fully elucidated how host presence influences parasite transmission and impact across different community types.

Purpose of the Study:

  • To investigate the direct and indirect impacts of a parasitic nematode invasion on freshwater fish communities in Trinidad.
  • To determine how the presence of guppies affects parasite infection rates and subsequent impacts on killifish.
  • To provide mechanistic insights into how parasites alter community structure through host demographic rates.

Main Methods:

  • Utilized a replicated natural experiment comparing fish communities before and after a parasitic nematode invasion.
  • Assessed host demographic rates across different stages of parasite establishment and community types (killifish-guppy vs. killifish-only).
  • Employed long-term mark-recapture studies and parallel field studies across five river systems to validate findings.

Main Results:

  • The parasitic invasion drastically shifted the killifish-guppy community ratio from 1:2 to 1:16.
  • Killifish living with guppies experienced doubled parasite infection rates and twice the parasite-related mortality compared to those in killifish-only communities.
  • Observed patterns of size- and community-dependent infection rates were consistent across multiple river systems.

Conclusions:

  • Parasites can profoundly alter community structure by directly impacting host demographics and indirectly through altered ecological interactions.
  • The presence of a secondary host species (guppies) can amplify the negative effects of a parasite on a primary host (killifish).
  • Long-term ecological studies are crucial for understanding the complex impacts of parasites on community dynamics and ecological interactions.