Number of surviving offspring 80 70 60 50 40 30 20 10 0 female mates once with one male female mates with same male 3 times female mates with 3 different males Ivy and Sakaluk (2005) studied the potential benefits of polyandry in decorated crickets. Their experimental design involved the following treatments: (a) Single mated females (b) Three times mated to same male (c) Three times mated to different males Data for offspring survival for each treatment are shown above. Possible explanations for this pattern include: Select one or more: a. female reproductive success is limited by sperm availability b. females receive direct benefits, such as spermatophores, every time they mate c. females derive increased fitness from polyandry, relative to monogamy
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The offspring survival is highest when the female mates with different males (treatment c), followed by when the female mates three times with the same male (treatment b), and lowest when the female mates only once (treatment a). Now, let's consider the possible Show more…
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