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Title: Accumulation of diverse parasite genotypes within the bivalve second intermediate host of the digenean 'Gymnophallus' sp.
Contributor(s): Leung, Tommy  (author); Poulin, Robert (author); Keeney, Devon B (author)
Publication Date: 2009
DOI: 10.1016/j.ijpara.2008.07.003
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Abstract: The complex life cycle of digenean trematodes with alternating stages of asexual multiplication and sexual reproduction can generate interesting within-host population genetic patterns. Metacercarial stages found in the second intermediate host are generally accumulated from the environment. Highly mobile second intermediate hosts can sample a broad range of cercarial genotypes and accumulate genetically diverse packets of metacercariae, but it is unclear whether the same would occur in systems where the second intermediate host is relatively immobile and cercarial dispersal is the sole mechanism that can maintain genetic homogeneity at the population level. Here, using polymorphic microsatellite markers, we addressed this issue by genotyping metacercariae of the trematode 'Gymnophallus' sp. from the New Zealand cockle 'Austrovenus stutchburyi'. Despite the relatively sessile nature of the second intermediate host of 'Gymnophallus', very high genotypic diversity of metacercariae was found within cockles, with only two cockles harbouring multiple copies of a single clonal lineage. There was no evidence of population structuring at the scale of our study, suggesting the existence of a well-mixed population. Our results indicate that (i) even relatively sessile second intermediate hosts can accumulate a high diversity of genotypes and (ii) the dispersal ability of cercariae, whether passive or not, is much greater than expected for such small and short-lived organisms. The results also support the role of the second intermediate host as an accumulator of genetic diversity in the trematode life cycle.
Publication Type: Journal Article
Source of Publication: International Journal for Parasitology, 39(3), p. 327-331
Publisher: Elsevier Ltd
Place of Publication: United Kingdom
ISSN: 0020-7519
Field of Research (FOR): 060411 Population, Ecological and Evolutionary Genetics
060899 Zoology not elsewhere classified
060808 Invertebrate Biology
Socio-Economic Objective (SEO): 970106 Expanding Knowledge in the Biological Sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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