PMID: 16637500Apr 28, 2006Paper

Minimal selfing, few clones, and no among-host genetic structure in a hermaphroditic parasite with asexual larval propagation

Evolution; International Journal of Organic Evolution
Charles D Criscione, Michael S Blouin

Abstract

Little is known about actual mating systems in natural populations of parasites or about what constitutes the limits of a parasite deme. These parameters are interesting because they affect levels of genetic diversity, opportunities for local adaptation, and other evolutionary processes. We expect that transmission dynamics and the distribution of parasites among hosts should have a large effect on mating systems and demic structure, but currently we have mostly speculation and very few data. For example, infrapopulations (all the parasites in a single host) should behave as demes if parasite offspring are transmitted as a clump from host to host over several generations. However, if offspring are well mixed, then the parasite component population (all the parasites among a host population) would function as the deme. Similarly, low mean intensities or a high proportion of worms in single infections should increase the selfing rate. For species having an asexual amplification stage, transmission between intermediate and definitive (final) hosts will control the variance in clonal reproductive success, which in turn could have a large influence on effective sizes and rates of inbreeding. We examined demic structure, selfing rate...Continue Reading

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Citations

Oct 16, 2010·Parasitology Research·Chunhua ZhouWeidong Peng
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