Size-dependent pattern of metacercariae accumulation in Macomona liliana: the threshold for infection in a dead-end host

While bivalves can acquire trematode metacercariae over their lifetime, the rate at which this accumulation takes place is not necessarily linear. The present study found that the bivalve Macomona liliana acquires very few or no metacercariae until it reaches 30 mm in size, but thereafter the rate a...

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Bibliographic Details
Published in:Parasitology research (1987) 2008-12, Vol.104 (1), p.177-180
Main Authors: Leung, Tommy L. F, Poulin, Robert
Format: Article
Language:English
Subjects:
Animals
Behavior, Animal
Biological and medical sciences
Biomedical and Life Sciences
Biomedicine
Bivalvia - parasitology
Cardiidae - parasitology
Echinostomatidae - growth & development
Echinostomatidae - physiology
Fundamental and applied biological sciences. Psychology
General aspects
General aspects and techniques. Study of several systematic groups. Models
Host-Parasite Interactions
Immunology
Invertebrates
Medical Microbiology
Microbiology
Short Communication
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Summary:While bivalves can acquire trematode metacercariae over their lifetime, the rate at which this accumulation takes place is not necessarily linear. The present study found that the bivalve Macomona liliana acquires very few or no metacercariae until it reaches 30 mm in size, but thereafter the rate at which it becomes infected increases exponentially. It is likely that this ontogenetic change in infection rate is associated with the increased filtration capacity and siphon diameter of larger M. liliana. The echinostome metacercariae that infect M. liliana also infect a much more common sympatric bivalve, Austrovenus stutchburyi, in which they achieve much higher infection intensity. Due to its deeper burying depth, M. liliana most likely represents a dead-end host for the echinostomes: potential definitive hosts preferentially feed upon A. stutchburyi as they are located closer to the sediment surface than M. liliana. However, due to the low infection intensity and population density of M. liliana, its overall impact as a sink for echinostome populations in the ecosystem is probably negligible.
ISSN:0932-0113
1432-1955
DOI:10.1007/s00436-008-1166-2