The effect of cohabitation of Tubifex tubifex (Oligochaeta: Tubificidae) populations on infections to Myxobolus cerebralis (Myxozoa: Myxobolidae)

Katherine A. Beauchamp, Mansour El-Matbouli, Melanie Gay, Marios P. Georgiadis, R. Barry Nehring, Ronald Hedrick

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

The competitive interactions between susceptible and resistant Tubifex tubifex (Oligochaeta: Tubificidae) exposed to Myxobolus cerebralis (Myxozoa: Myxobolidae) infections were investigated in two laboratory trials. Competition was assessed by the total parasite production over the course of the trials in mixed and pure cultures of M. cerebralis exposed worms, and by the genetic analyses of worms from the control and experimental groups at the beginning and end of the experiments. Mixed cultures of resistant and susceptible worms showed a 70% reduction in production of parasites released when compared with pure cultures of susceptible worms. In studies with laboratory and field-collected oligochaetes the mixed cultures at the end of the cohabitation experiments were dominated by resistant Tubifex from lineage V (HB strain) this strain of Tubifex has a competitive advantage over worms from other lineages. The results of this study suggest that certain species of Tubifex may be dead-end hosts to M. cerebralis by absorbing or inactivating the parasite and may also show greater survival compared to susceptible oligochaetes in certain whirling disease enzootic habitats.

Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalJournal of Invertebrate Pathology
Volume91
Issue number1
DOIs
StatePublished - Jan 1 2006

Keywords

  • Host genetics
  • Myxobolus cerebralis
  • Salmonid whirling disease
  • Tubifex tubifex

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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