標題: [新聞] Massive floods drove millions of spiders into the trees to spin their webs. [打印本頁] 作者: netaccess 時間: 2011-4-28 01:59 PM 標題: Massive floods drove millions of spiders into the trees to spin their webs.
本帖最後由 netaccess 於 2011-4-28 02:04 PM 編輯
Another unusualy story i pick up from National Geographic...
Trees rising above the floodwaters became safe havens for web-spinning spiders in Sindh, Pakistan, as seen in December 2010.
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A spider web enshrouds a tree in Sindh, Pakistan, in a December 2010 photograph.
The unusual cocoons were a mixed blessing:
The bad point is that the huge webs ultimately killed many of the trees they covered, perhaps by reducing the amount of sunlight reaching their leaves.
The area is incredibly hot in summer, and there is very little natural foliage cover for people to use as shade to begin with. Without the trees lining roads and fields, there will be little refuge from the summer sun.
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The good point is tha the webs also seemed to help trap more mosquitoes in the region, thereby reducing the risk of malaria. Normally after a flood, the remaining stagnant water provides more opportunities for mosquitoes to breed. But people in Sindh reported far fewer mosquitoes than expected following the recent crisis.作者: leffie 時間: 2011-4-30 05:30 PM
the tree will die soon in this condition. at that time, the spiders will lose their shelter. it's vicious cycle