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Abstract:

Sperm competition (SC) is a major component of sexual selection that enhances intra- and intersexual conflicts and may trigger rapid adaptive evolution of sexual characters. The actual role of SC on rapid evolution, however, is poorly understood. Besides, the relative contribution of distinctive features of the mating system to among species variation in the strength of SC remains unclear. Here, we assessed the strength of SC and mating system factors that may account for it in the closely related species Drosophila buzzatii and Drosophila koepferae. Our analyses reveal higher incidence of multiple paternity and SC risk in D. buzzatii wild-inseminated females. The estimated number of fathers per brood was 3.57 in D. buzzatii and 1.95 in D. koepferae. In turn, the expected proportion of females inseminated by more than one male was 0.89 in D. buzzatii and 0.58 in D. koepferae. Laboratory experiments show that this pattern may be accounted for by the faster rate of stored sperm usage observed in D. koepferae and by the greater female remating rate exhibited by D. buzzatii. We also found that the male reproductive cost of SC is also higher in D. buzzatii. After a female mated with a second male, first-mating male fertility was reduced by 71.4% in D. buzzatii and only 33.3% in D. koepferae. Therefore, we may conclude that postmating sexual selection via SC is a stronger evolutionary force in D. buzzatii than in its sibling. © 2013 John Wiley & Sons Ltd.

Registro:

Documento: Artículo
Título:Multiple paternity and sperm competition in the sibling species Drosophila buzzatii and Drosophila koepferae
Autor:Hurtado, J.; Iglesias, P.P.; Lipko, P.; Hasson, E.
Filiación:Departamento de Ecología, Genética y Evoluciõn, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellõn II, C1428EGA Buenos Aires, Argentina
Palabras clave:mating system; polyandry; sexual selection; sperm competition; sperm precedence; sperm usage; microsatellite DNA; animal; article; comparative study; Drosophila; female; fertility; genetic variability; genetics; genotype; male; mating system; physiology; polyandry; reproduction; sexual behavior; sexual selection; sperm competition; sperm precedence; sperm usage; spermatozoon; mating system; polyandry; sexual selection; sperm competition; sperm precedence; sperm usage; Animals; Drosophila; Female; Fertility; Genetic Variation; Genotype; Male; Microsatellite Repeats; Reproduction; Sexual Behavior, Animal; Spermatozoa
Año:2013
Volumen:22
Número:19
Página de inicio:5016
Página de fin:5026
DOI: http://dx.doi.org/10.1111/mec.12436
Título revista:Molecular Ecology
Título revista abreviado:Mol. Ecol.
ISSN:09621083
CODEN:MOECE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09621083_v22_n19_p5016_Hurtado

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Citas:

---------- APA ----------
Hurtado, J., Iglesias, P.P., Lipko, P. & Hasson, E. (2013) . Multiple paternity and sperm competition in the sibling species Drosophila buzzatii and Drosophila koepferae. Molecular Ecology, 22(19), 5016-5026.
http://dx.doi.org/10.1111/mec.12436
---------- CHICAGO ----------
Hurtado, J., Iglesias, P.P., Lipko, P., Hasson, E. "Multiple paternity and sperm competition in the sibling species Drosophila buzzatii and Drosophila koepferae" . Molecular Ecology 22, no. 19 (2013) : 5016-5026.
http://dx.doi.org/10.1111/mec.12436
---------- MLA ----------
Hurtado, J., Iglesias, P.P., Lipko, P., Hasson, E. "Multiple paternity and sperm competition in the sibling species Drosophila buzzatii and Drosophila koepferae" . Molecular Ecology, vol. 22, no. 19, 2013, pp. 5016-5026.
http://dx.doi.org/10.1111/mec.12436
---------- VANCOUVER ----------
Hurtado, J., Iglesias, P.P., Lipko, P., Hasson, E. Multiple paternity and sperm competition in the sibling species Drosophila buzzatii and Drosophila koepferae. Mol. Ecol. 2013;22(19):5016-5026.
http://dx.doi.org/10.1111/mec.12436