| Encystment site affects the reproductive strategy of a progenetic trematode in its fish intermediate host: is host spawning an exit for parasite eggs? | |
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MedLine Citation:
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PMID: 21767434 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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SUMMARYEach transmission event in complex, multi-host life cycles create obstacles selecting for adaptations by trematodes. One such adaptation is life cycle abbreviation through progenesis, in which the trematode precociously matures and reproduces within the second intermediate host. Progenesis eliminates the need for the definitive host and increases the chance of life cycle completion. However, progenetic individuals face egg-dispersal challenges associated with reproducing within metacercarial cysts in the tissues or body cavity of the second intermediate host. Most progenetic species await host death for their eggs to be released into the environment. The present study investigated temporal variation of progenesis in Stegodexamene anguillae in one of its second intermediate fish hosts and the effect of the fish's reproductive cycle on progenesis. The study involved monthly sampling over 13 months at one locality. A greater proportion of individuals became progenetic in the gonads of female fish hosts. Additionally, progenesis of worms in the gonads was correlated with seasonal daylight and temperature changes, major factors controlling fish reproduction. Host spawning events are likely to be an avenue of egg dispersal for this progenetic species, with the adoption of progenesis being conditional on whether or not the parasite can benefit from fish spawning. |
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Authors:
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Kristin K Herrmann; Robert Poulin |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-18 |
Journal Detail:
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Title: Parasitology Volume: - ISSN: 1469-8161 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-7-19 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401121 Medline TA: Parasitology Country: - |
Other Details:
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Languages: ENG Pagination: 1-10 Citation Subset: - |
Affiliation:
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Department of Zoology, University of Otago, Dunedin, New Zealand. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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