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Practice Listening: Select Missing Word
ID: #4238
Short
Butterflies
Transcript:
“When the caterpillars are really small, those spores get into the monarch’s gut and they break apart and they start drilling holes in the gut lining and reproducing and just doing nasty parasite things that are bad for the monarchs. Leslie Decker, an ecologist at Stanford University. Decker and her colleagues raised hundreds of monarchs. They fed half the caterpillars milkweed grown at current CO2 levels. The other half got milkweed grown at nearly double those CO2 levels. “What we found is that elevated CO2 changes the medicinal quality of the milkweed in a way that makes monarchs sicker. They're less able to tolerate their pathogen, so the parasite becomes more hurtful, to them. And it also reduces their overall lifespan when they're infected in comparison to uninfected monarchs.” The caterpillars that ate milkweed grown with more carbon dioxide grew into butterflies that - died as much as a week earlier than the normal life span.
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