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I've read that the strips are used to warn birds and larger animals that there is a web there. Select your preferred way to display the comments and click 'Save settings' to activate your changes. Disclaimer: Dedicated naturalists volunteer their time and resources here to provide this service.
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In North America, Argiope aurantia is commonly known as the black and yellow garden spider, zipper spider, corn spider, and writing spider, because of the similarity of the web stabilimenta to writing.
In England, Argiope bruennichi, where it is found only on the southern coast, and in other parts of Europe, including Germany, is also known as the wasp spider.

I have read several comments about the function of the zigzag pattern in the central portion of the web of the black and yellow Argiope. We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. StarkBlack and yellow with zig zag web pattern - Argiope aurantia - Newton, NJ, USA, New Jersey, USAAugust 26, 2005tag · login or register to post commentsContributed by James B.
The beautiful photographs taken by a number of contributors seem to document that the zigzag pattern can be variable in complexity and size. While I was watching a large female Argiope, I got a little too close and noticed her "spring" from one side of the web to the other, almost as if her "push-up" snapped her to the other side. It was a bit disconcerting that the entire web bowed briefly toward me as she snapped to the other side.
Andrew's Cross spiders, for their habit of resting in the web with legs outstretched in the shape of an X, the cross of St.

I'd suggest that the zigzag silk offers several things: (1) strong structural support, (2) a rather thick defensive line of silk to avoid predators (birds)by quickly snapping to the opposite side of the web, (3) camouflage, (4) a springboard to actively bow the web out several inches to meet and capture prey rather than relying totally on a direct insect strike on the web, (5) a platform to carry out the spinning of silk around prey and eating, and (6) maybe a means to dissipate heat since these spiders like to be exposed in full sunlight and their black and yellow bodies are likely to absorb considerable radiation. The suggestion of one of the contributors that the zigzag silk may refract ultraviolet radiation and mimic patterns on flowers and attract certain insects is an interesting hypothesis. The large white zigzag in the centre of its web is called the stabilimentum or web decoration.

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