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Journal Article

Sperm Competition in the Field Cricket Gryllus integer (Orthoptera: Gryllidae)

Vickie L. Backus and William H. Cade
The Florida Entomologist
Vol. 69, No. 4 (Dec., 1986), pp. 722-728
DOI: 10.2307/3495220
Stable URL: http://www.jstor.org/stable/3495220
Page Count: 7
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Sperm Competition in the Field Cricket Gryllus integer (Orthoptera: Gryllidae)
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Abstract

Sperm competition was studied in the field cricket Gryllus integer. Control females mated with a normal, fertile male, and then with a second fertile male (NN females). Experimental females mated with a fertile male and then with a male sterilized with gamma radiation (NR females), or with a sterile male and then with a fertile male (RN females). Females oviposited in individual dishes for 8 days, and 3 successive dishes were used for each female for eight days each. Nymphs and unhatched eggs were counted for each female for each dish. There were generally no differences in the percentage of eggs hatching when different dishes were compared. Considering all egg dishes, NN and RN females produced significantly more offspring than NR, but there were no differences between NN and RN females. Mean P2 value, the proportion of eggs fertilized by the second male, is 0.72. These data suggest that the second mate fertilizes more of a female's eggs, but that a degree of sperm mixing occurs. /// Se estudió la competencia de las espermas del grillo Gryllus integer. Hembras testigos se aparearon con machos fértiles normales y después con un segundo macho fertil (hembras NN). Las hembras en el experimento se aparearon con un macho fértil y después con un macho esterilizado con radiación gama (hembras NR), o con un macho estéril y después con un macho fértil (hembras RN). Las hembras pusieron huevos en platos individuales por 8 días, y se usaron sucesivamente 3 platos para cada hembra por 8 días cada uno. Se contaron las ninfas y huevos sin nacer de cada hembra en cada plato. Generalmente no hubo diferencias en el porcentaje de huevos que nacieron cuando se compararon los distintos platos. Cuando se consideran todos los platos con huevos, hembras NN y RN producieron significativamente más descendientes que NR, pero no hubieron diferencias entre hembras NN y RN. El valor promedio de P2 que es la proporción de huevos fertilizados por un segundo macho, fue de 0.72. Los datos sugieren que el segundo apareamiento fecundó más huevos, pero que ocurre cierta mezcla de espermas.

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