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Título

Differences in sperm traits associated to sperm competition between rodent natural populations

Autor Tourmente, Maximiliano ; Luque-Larena, Juan José; Roldán, Eduardo R. S.
Fecha de publicación jul-2014
Citación 14th Rodens et Spatium (2014)
ResumenSexual selection may promote divergence between populations. Sperm competition, one form of post-copulatory sexual selection, is known to favour changes in ejaculate quality and sperm swimming speed, which improve ejaculate competitiveness. We thus tested the prediction that natural populations from species with high levels of sperm competition should diverge to a greater extent in ejaculate traits than those from species with low levels of sperm competition. We compared populations of two rodent species with different sperm competition levels. Results showed that populations from a species with high levels of sperm competition (Apodemus sylvaticus) exhibited differences in relative testes size, sperm quality and swimming velocity. In addition, variation within populations was small. In contrast, populations from a species with low levels of sperm competition (Mus domesticus) showed fewer differences between populations and a larger degree of variation within populations, which resulted in a substantial degree of overlap in sperm traits between populations. We conclude that sperm competition may promote divergence in sperm traits because populations tend to differ in the intensity of sexual selection, leading to different rates of evolutionary change and a small degree of variation within populations.
Descripción Resumen de la comunicación presentada en el Symposium "Rodent population dynamics: ecology & management", en el 14th Rodens et Spatium (International Conference on Rodent Biology: Lisbon, Portugal - 28th July - 2nd Agust 2014)
URI http://hdl.handle.net/10261/128589
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