News From the Field
Dramatic Comeback of Male Butterflies in Population That Was Once Nearly Entirely Male
July 12, 2007
Researchers have documented a remarkable example of natural selection in a tropical butterfly species that fought back--genetically speaking--against a highly invasive, male-killing bacteria. Within 10 generations that spanned less than a year, the proportion of males of the Hypolimnas bolina butterfly on the South Pacific island of Savaii jumped from a meager 1 percent of the population to about 39 percent.
University of California, Berkeley
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