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SPERM COMPETITION AND THE ASSURANCE OF UNDERGROUND COPULATION IN THE SAND-BUBBLER CRAB SCOPIMERA GLOBOSA (BRACHYURA: OCYPODIDAE)

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ABSTRACT Studies of sperm competition are necessary for understanding mating systems in species where two or more males copulate with a single female. We studied fertilization ratios of successive male mates in the sand-bubbler crab Scopimera globosa (de Haan) (family Ocypodidae). Males copulate on the surface or pair underground. The male pairing underground is the last to inseminate the female before she extrudes eggs, as is the case in most ocypodid crabs. In serial mating experiments using irradiated and normal males, the last male to mate fertilized over 90% of the eggs. Females forced to mate in the burrows of irradiated males extruded infertile eggs, indicating that sperm transfer occurred in the burrow.

10.1163/193724093X00507
/content/journals/10.1163/193724093x00507
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/content/journals/10.1163/193724093x00507
2017-09-21

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