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Tufts University biologists unveil more mysteries of fireflies flash

y's flash is a good predictor of the nuptial gift he's capable of delivering.

"Because Photinus fireflies don't eat once they become adults, male nuptial gifts provide a key source of nutrition for a female and her eggs," says Cratsley.

Lewis plans to continue her firefly research to examine whether the size of nuptial gifts affects the success of fertilization. A female firefly mates with multiple males, but she controls the number of eggs that each male will fertilize. Competition for fertilization continues after mating in a process called "post-copulatory female choice." Lewis' continued research will focus on whether spermatophore size influences this choice.

"When Darwin talked about sexual selection, he spoke primarily of mate choice," said Lewis. "In recent years we have begun to realize that choice of mate isn't everything. Sexual selection continues after mating."

Lewis' previous research on how fireflies use nitric oxide to turn their flashes on and off was published in the June 2001 issue of Science.


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Contact: Craig LeMoult
craig.lemoult@tufts.edu
617-627-4317
Tufts University
14-Apr-2003


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