INTRASPECIFIC VARIATION OF P2-VALUE IN A COCCINELLID BEETLE, HARMONIA-AXYRIDIS

Intraspecific variation in P2 value in a coccinellid beetle (Harmonia axyridis) was investigated. The analytical method by Parker et al. (19 90) predicts that sperm-flushing displacement in the spermatheca may e xist in the sperm utilization pattern of this species. Long duration o f sperm transfer in the second copulation resulted in high fertilizati on success of the second male. Large male body size itself did not hav e an advantage in flushing efficiency of the previously stored sperm. However, through long duration of sperm transfer and larger ejaculate, males with large body size gain high fertilization success.