Do the Infectious Diseases of Dreissenids Represent a Threat ......Molloy & Associates, LLC March...
Transcript of Do the Infectious Diseases of Dreissenids Represent a Threat ......Molloy & Associates, LLC March...
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Do the Infectious Diseases of Dreissenids
Represent a Threat to North American
Unionid Populations?
Daniel P. Molloy, Ph.D.
State University of New York Great Lakes Center
Molloy & Associates, LLC
March 13, 2018
Freshwater Mollusk Conservation Society
Freshwater Mollusk Health and Disease Assessment Workshop
La Crosse, Wisconsin
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Infectious diseases of dreissenids represent a threat to
North American unionid populations?
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>30 species of parasites in Eurasian Dreissena spp.
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Types of parasites in dreissenids…..
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Haplosporidia in
connective
tissue
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Dr. Z. Raabe
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None of these species observed in unionids
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…. and likewise Conchophthirus ciliates found in unionids are
not found in dreissenids
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O. hemophaga is in Mohawk River in D. polymorpha
in New York State
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Yes, they are developing in the lumen of the
digestive gland ducts, consuming food, blood
cells, etc…..
.... But no evidence otherwise of negative impact
on host dreissenids….
Ophryoglena has never been reported from
digestive glands of Eurasian unionids…..
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Prokaryotes: Rickettsiales
Prokaryotes : Chlamydiales
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macrocotyle
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Aspidogastrid trematodes can cause internal host
damage, but clear documentation is lacking in the
literature that they kill their unionid hosts.
Aspidogaster conchicola has been reported from both
unionids and dreissenids, and other freshwater bivalves.
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Take Home Message
Q: Infectious diseases of dreissenids represent a threat to
North American unionid populations?
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Take Home Message
Q: Infectious diseases of dreissenids represent a threat to
North American unionid populations?
A: No evidence to warrant any concern yet