38.
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2015학년도 수능
2015학년도 수능
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38.
Exactly how cicadas keep track of time has always intrigued researchers, and it has always been assumed that the insects must rely on an internal clock. Recently, however, one group of scientists working with the 17-year cicada in California have suggested that the nymphs use an external cue and that they can count. For their experiments they took 15-year-old nymphs and moved them to an experimental enclosure. These nymphs should have taken a further two years to emerge as adults, but in fact they took just one year. The researchers had made this happen by lengthening the period of daylight to which the peach trees on whose roots the insects fed were exposed. By doing this, the trees were "tricked" into flowering twice during the year rather than the usual once. Flowering in trees coincides with a peak in amino acid concentrations in the sap that the insects feed on. So it seems that the cicadas keep track of time by counting the peaks.
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