A spider's sticky web contains traces of the critter's DNA, as well as the DNA of whatever prey that was unlucky enough to get stuck in the web, according to a new study, which found that these tiny samples of DNA can be amplified and sequenced in a lab. In other words, an empty spider web isn't a mystery; it's a clue that can tell scientists what kind of spider built the web and what prey it snagged in its trap.
Knowing exactly which species of spider built a web in a certain area, as well as knowing what that spider feasted on, is important information for researchers in a variety of fields -- from conservation ecology to pest management, said study lead author Charles C.Y. Xu, a graduate student in the Erasmus Mundus Master Programme (MEME) in evolutionary biology, a joint program hosted by four European universities and Harvard University in the United States.
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Source: CBS News