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1 .This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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2 .Ladybugs love to snack on aphids and other pests.
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3 .So people began importing an Asian species called the harlequin ladybird as natural pest control.
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4 .But in their new environments, the harlequins wiped out native ladybugs.
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5 .And they have their parasites to thank.
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6 .That's according to research in the journal Science.
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7 .A parasite called microsporidia lies dormant in the circulatory systems of harlequin ladybirds.
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8 .But when scientists injected microsporidia into a common European ladybug species, the insects died within two weeks.
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9 .When the ladybugs were injected with dead microsporidia or a control substance most survived.
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10 .Harlequin ladybirds' immune systems, on the other hand, have learned to deal with microsporidia,
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11 .which lets the insects use them as biological weapons.
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12 .Because one way ladybugs compete is by consuming the eggs and larvae of rival species.
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13 .When European ladybug species eat the harlequin ladybird eggs and larvae, they also consume the microsporidia.
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14 .And die.
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15 .The discovery demonstrates an important role of immunity in evolutionary selection.
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16 .And it shows that there are many ways to lose a food fight.
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17 .Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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