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Conditional persistence and tolerance characterize endoparasite-colonial host interactions.

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This summary is machine-generated.

This study reveals how the parasite Tetracapsuloides bryosalmonae exploits the clonal reproduction of Fredericella sultana. Moderate infections boost bryozoan reproduction, while starvation triggers parasite transmission stages.

Keywords:
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Area of Science:

  • Ecology
  • Parasitology
  • Freshwater Biology

Background:

  • Colonial hosts provide unique transmission opportunities for endoparasites.
  • Interactions between colonial hosts and endoparasites are not well understood.
  • Fredericella sultana (bryozoan) and Tetracapsuloides bryosalmonae (myxozoan) serve as a model system.

Purpose of the Study:

  • Investigate how T. bryosalmonae exploits F. sultana's asexual reproduction.
  • Evaluate the impact of parasite transmission on the bryozoan host.
  • Test the terminal investment hypothesis: does poor host condition trigger parasite release?

Main Methods:

  • Examined infection prevalence in F. sultana colony fragments and statoblasts.
  • Assessed the effects of T. bryosalmonae infection on bryozoan statoblast hatching.
  • Monitored parasite development in relation to host starvation.

Main Results:

  • Infections were found in significant proportions of colony fragments and statoblasts.
  • Moderate infection levels enhanced statoblast hatching and host fecundity.
  • Host starvation induced the development of T. bryosalmonae transmission stages, supporting terminal investment.

Conclusions:

  • T. bryosalmonae persists in F. sultana through multiple transmission routes and host condition-dependent cycling.
  • F. sultana exhibits host tolerance, facilitated by increased fecundity and clonal replication.
  • Parasite-host dynamics are characterized by parasite persistence and host tolerance.