TY - JOUR
T1 - The effect of cohabitation of Tubifex tubifex (Oligochaeta
T2 - Tubificidae) populations on infections to Myxobolus cerebralis (Myxozoa: Myxobolidae)
AU - Beauchamp, Katherine A.
AU - El-Matbouli, Mansour
AU - Gay, Melanie
AU - Georgiadis, Marios P.
AU - Nehring, R. Barry
AU - Hedrick, Ronald
PY - 2006/1/1
Y1 - 2006/1/1
N2 - 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.
AB - 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.
KW - Host genetics
KW - Myxobolus cerebralis
KW - Salmonid whirling disease
KW - Tubifex tubifex
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U2 - 10.1016/j.jip.2005.08.006
DO - 10.1016/j.jip.2005.08.006
M3 - Article
C2 - 16321396
AN - SCOPUS:29344445202
VL - 91
SP - 1
EP - 8
JO - Journal of Invertebrate Pathology
JF - Journal of Invertebrate Pathology
SN - 0022-2011
IS - 1
ER -