| The evolution from females to hermaphrodites results in a sexual conflict over mating in androdioecious nematode worms and clam shrimp. | |
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MedLine Citation:
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PMID: 20074309 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The nematode worm Caenorhabditis elegans and the clam shrimp Eulimnadia texana are two well-studied androdioecious species consisting mostly of self-fertilizing hermaphrodites and few males. To understand how androdioecy can evolve, a simple two-step mathematical model of the evolutionary pathway from a male-female species to a selfing-hermaphrodite species is constructed. First, the frequency of mutant females capable of facultative self-fertilization increases if the benefits of reproductive assurance exceed the cost. Second, hermaphrodites become obligate self-fertilizers if the fitness of selfed offspring exceeds one-half the fitness of outcrossed offspring. Genetic considerations specific to C. elegans and E. texana show that males may endure as descendants of the ancestral male-female species. These models combined with an extensive literature review suggest a sexual conflict over mating in these androdioecious species: selection favours hermaphrodites that self and males that outcross. The strength of selection on hermaphrodites and males differs, however. Males that fail to outcross suffer a genetic death. Hermaphrodites may never encounter a rare male, and those that do and outcross only bear less fecund offspring. This asymmetric sexual conflict results in an evolutionary stand-off: rare, but persistent males occasionally fertilize common, but reluctant hermaphrodites. A consequence of this stand-off may be an increase in the longevity of the androdioecious mating system. |
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Authors:
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J R Chasnov |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Review Date: 2010-01-14 |
Journal Detail:
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Title: Journal of evolutionary biology Volume: 23 ISSN: 1420-9101 ISO Abbreviation: J. Evol. Biol. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-05-21 Completed Date: 2010-09-07 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8809954 Medline TA: J Evol Biol Country: Switzerland |
Other Details:
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Languages: eng Pagination: 539-56 Citation Subset: IM |
Affiliation:
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Department of Mathematics, Hong Kong University of Science and Technology, Kowloon, Hong Kong. jeffrey.chasnov@ust.hk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Caenorhabditis elegans / genetics* Crustacea / genetics* Evolution* Female Hermaphroditism / genetics Inbreeding* Male Models, Genetic* Selection, Genetic |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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