雅思听力section 4真题：蜜蜂的交流_雅思英语听力

雅思听力section 4真题：蜜蜂的交流

　　The scientists watched the waggle dance occurring in a glass observation hive and identified recruits. They captured these recruits as they left the hive, attached a radar transponder to them and then tracked their flight paths using harmonic radar. Most recruited bees undertook a flight path that took them straight to the vicinity of the feeding site where they all spent a lot of time in searching flights, trying to locate its exact position. This searching behaviour accounts for the time lag that caused the original controversy.

　　In another set of experiments, bee recruits leaving the hive were taken to release sites up to 250m away. These bees flew, not to the feeding site, but in the direction that would have taken them to the feeding site had they not been displaced from the hive. This result adds weight to von Frischs original theory and allows alternative hypotheses about bee behaviour to be firmly discounted.

　　Entomologists have long known that bees use polarized sunlight to navigate. Two Swiss scientists now say that a bees navigational map lies embedded in special photoreceptors in its eyes. According to Samuel Rossel and Rudiger Wehner of the University of Zurich, ... the array of receptors forms a template which the bee uses to scan and match the polarization patterns in the sky.

　　In the 1940s, Nobel laureate Karl von Frisch showed that bees have a simple yet elegant way of communicating the location of distant sources of food. When a foraging bee returns to the hive, she performs a waggle dance consisting of a short run ending in a loop that returns her to the beginning point of her run. The direction of her run indicates the direction of the food source with respect to the sun.