Experimental evolution of sperm competitiveness in a mammal
<p>Abstract</p> <p>Background</p> <p>When females mate with multiple partners, sperm from rival males compete to fertilise the ova. Studies of experimental evolution have proven the selective action of sperm competition on male reproductive traits. However, while reprod...
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| Format: | Article |
| Language: | English |
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BMC
2011-01-01
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| Series: | BMC Evolutionary Biology |
| Online Access: | http://www.biomedcentral.com/1471-2148/11/19 |
| _version_ | 1818379283914031104 |
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| author | Simmons Leigh W Firman Renée C |
| author_facet | Simmons Leigh W Firman Renée C |
| author_sort | Simmons Leigh W |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>When females mate with multiple partners, sperm from rival males compete to fertilise the ova. Studies of experimental evolution have proven the selective action of sperm competition on male reproductive traits. However, while reproductive traits may evolve in response to sperm competition, this does not necessarily provide evidence that sperm competitive ability responds to selection. Indeed, a study of <it>Drosophila </it>failed to observe divergence in sperm competitive ability of males in lines selected for enhanced sperm offence and defence.</p> <p>Results</p> <p>Adopting the naturally polygamous house mouse (<it>Mus domesticus</it>) as our vertebrate model, we performed an experimental evolution study and observed genetic divergence in sperm quality; males from the polygamous selection lines produced ejaculates with increased sperm numbers and greater sperm motility compared to males from the monogamous lines. Here, after 12 generations of experimental evolution, we conducted competitive matings between males from lineages evolving under sperm competition and males from lineages subject to relaxed selection. We reduced variation in paternity arising from embryo mortality by genotyping embryos <it>in utero </it>at 14 days gestation. Our microsatellite data revealed a significant paternity bias toward males that evolved under the selective regime of sperm competition.</p> <p>Conclusion</p> <p>We provide evidence that the sperm competitiveness phenotype can respond to selection, and show that improved sperm quality translates to greater competitive fertilisation success in house mice.</p> |
| first_indexed | 2024-12-14T02:00:20Z |
| format | Article |
| id | doaj.art-0885aee628ad4fd7b064d21e29c6cdfa |
| institution | Directory Open Access Journal |
| issn | 1471-2148 |
| language | English |
| last_indexed | 2024-12-14T02:00:20Z |
| publishDate | 2011-01-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Evolutionary Biology |
| spelling | doaj.art-0885aee628ad4fd7b064d21e29c6cdfa2022-12-21T23:21:01ZengBMCBMC Evolutionary Biology1471-21482011-01-011111910.1186/1471-2148-11-19Experimental evolution of sperm competitiveness in a mammalSimmons Leigh WFirman Renée C<p>Abstract</p> <p>Background</p> <p>When females mate with multiple partners, sperm from rival males compete to fertilise the ova. Studies of experimental evolution have proven the selective action of sperm competition on male reproductive traits. However, while reproductive traits may evolve in response to sperm competition, this does not necessarily provide evidence that sperm competitive ability responds to selection. Indeed, a study of <it>Drosophila </it>failed to observe divergence in sperm competitive ability of males in lines selected for enhanced sperm offence and defence.</p> <p>Results</p> <p>Adopting the naturally polygamous house mouse (<it>Mus domesticus</it>) as our vertebrate model, we performed an experimental evolution study and observed genetic divergence in sperm quality; males from the polygamous selection lines produced ejaculates with increased sperm numbers and greater sperm motility compared to males from the monogamous lines. Here, after 12 generations of experimental evolution, we conducted competitive matings between males from lineages evolving under sperm competition and males from lineages subject to relaxed selection. We reduced variation in paternity arising from embryo mortality by genotyping embryos <it>in utero </it>at 14 days gestation. Our microsatellite data revealed a significant paternity bias toward males that evolved under the selective regime of sperm competition.</p> <p>Conclusion</p> <p>We provide evidence that the sperm competitiveness phenotype can respond to selection, and show that improved sperm quality translates to greater competitive fertilisation success in house mice.</p>http://www.biomedcentral.com/1471-2148/11/19 |
| spellingShingle | Simmons Leigh W Firman Renée C Experimental evolution of sperm competitiveness in a mammal BMC Evolutionary Biology |
| title | Experimental evolution of sperm competitiveness in a mammal |
| title_full | Experimental evolution of sperm competitiveness in a mammal |
| title_fullStr | Experimental evolution of sperm competitiveness in a mammal |
| title_full_unstemmed | Experimental evolution of sperm competitiveness in a mammal |
| title_short | Experimental evolution of sperm competitiveness in a mammal |
| title_sort | experimental evolution of sperm competitiveness in a mammal |
| url | http://www.biomedcentral.com/1471-2148/11/19 |
| work_keys_str_mv | AT simmonsleighw experimentalevolutionofspermcompetitivenessinamammal AT firmanreneec experimentalevolutionofspermcompetitivenessinamammal |