monandrous female "d. pseudoobscura" do not obtain sufficient sperm or a plenty of suitable sperm for the fertilization. even though monandrous female experiencing multiple copulations can produce more eggs than polyandrous female experiencing multiple copulations, monandrous females produce less offspring that survive into adulthood than polyandrous females do. this means that polyandrous females have higher egg-to-adult survival ratio than monandrous females, making the polyandrous females more fit.