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科学美国人60秒 SSS Ants Use Celestial Cues to Travel in Reverse

时间:2017-03-06 07:04:25

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(单词翻译)

 

Next time you need directions, maybe ask an ant. Because these clever little critters are such masters of navigation that some can find their way home… whether they’re walking forward, backward, or sideways. That’s according to a study in the journal Current Biology. [Sebastian Schwarz et al, How Ants Use Vision When Homing Backward]

Ants often travel long distances—well, for them—when they’re searching for food to bring back to their nests. And their built-in GPS appears to function just fine even when they wind up having to travel in reverse because they’re dragging a huge morsel1. But how do these backward bugs2 know where they’re going? 

To find out, researchers went to Spain to mess with some desert ants. They found an active nest and surrounded it with barriers that forced the foraging3 ants to follow a particular path back home. Once the ants were familiar with the maze4, the researchers would scoop5 them up…hand them a cookie crumb6…and then put them back in a different location…one that required taking a 90 degree turn to get to the nest. 

What the researchers saw was that the ants that were carting a small, easy-to-carry crumb would dash forward with confidence and were able to hook a right and head on home. Presumably because they could see where they were going and recognized the route. 

But some of their nest-mates were given a cookie crumb so large that they had to travel aft-first, pulling their prize behind them. These ants would set off in the correct general direction. But those that stuck with going in reverse would miss the turnoff to the nest. 

Some of the rearward ants, however, stopped to get their bearings. They would drop the cookie and turn around to take a look at the landscape. This quick peek7 allowed the six-legged savants to reset8 their inner maps. So that after turning back around to grab their cookies they headed in the right direction, even going back-end first.  

The ants-in-reverse appear to use celestial9 cues…like the position of the sun…to keep them on the straight and narrow. When the researchers used a mirror to make it look like the sun was on the other side of the sky, the beleaguered10 backward ants would turn tail for the opposite direction. 

So ants integrate a lot of information…about local landmarks11, the position of the sun, and where their bodies are situated12 in space…to successfully bring home the bacon… all while going backwards13

Lead author Antoine Wystrach, a CNRS researcher at the University of Toulouse 3, adds:

“This behavior is interesting in itself, as it implies a synergy between at least three types of memory: the long-term memories of the route sceneries, the memory of the new direction to follow, and the memory of the cookie left behind.” 

—Karen Hopkin 

[The above text is a transcript14 of this podcast.]


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1 morsel Q14y4     
n.一口,一点点
参考例句:
  • He refused to touch a morsel of the food they had brought.他们拿来的东西他一口也不吃。
  • The patient has not had a morsel of food since the morning.从早上起病人一直没有进食。
2 bugs e3255bae220613022d67e26d2e4fa689     
adj.疯狂的,发疯的n.窃听器( bug的名词复数 );病菌;虫子;[计算机](制作软件程序所产生的意料不到的)错误
参考例句:
  • All programs have bugs and need endless refinement. 所有的程序都有漏洞,都需要不断改进。 来自《简明英汉词典》
  • The sacks of rice were swarming with bugs. 一袋袋的米里长满了虫子。 来自《简明英汉词典》
3 foraging 6101d89c0b474e01becb6651ecd4f87f     
v.搜寻(食物),尤指动物觅(食)( forage的现在分词 );(尤指用手)搜寻(东西)
参考例句:
  • They eke out a precarious existence foraging in rubbish dumps. 他们靠在垃圾场捡垃圾维持着朝不保夕的生活。 来自《简明英汉词典》
  • The campers went foraging for wood to make a fire. 露营者去搜寻柴木点火。 来自辞典例句
4 maze F76ze     
n.迷宫,八阵图,混乱,迷惑
参考例句:
  • He found his way through the complex maze of corridors.他穿过了迷宮一样的走廊。
  • She was lost in the maze for several hours.一连几小时,她的头脑处于一片糊涂状态。
5 scoop QD1zn     
n.铲子,舀取,独家新闻;v.汲取,舀取,抢先登出
参考例句:
  • In the morning he must get his boy to scoop it out.早上一定得叫佣人把它剜出来。
  • Uh,one scoop of coffee and one scoop of chocolate for me.我要一勺咖啡的和一勺巧克力的。
6 crumb ynLzv     
n.饼屑,面包屑,小量
参考例句:
  • It was the only crumb of comfort he could salvage from the ordeal.这是他从这场磨难里能找到的唯一的少许安慰。
  • Ruth nearly choked on the last crumb of her pastry.鲁斯几乎被糕点的最后一块碎屑所噎住。
7 peek ULZxW     
vi.偷看,窥视;n.偷偷的一看,一瞥
参考例句:
  • Larry takes a peek out of the window.赖瑞往窗外偷看了一下。
  • Cover your eyes and don't peek.捂上眼睛,别偷看。
8 reset rkHzYJ     
v.重新安排,复位;n.重新放置;重放之物
参考例句:
  • As soon as you arrive at your destination,step out of the aircraft and reset your wristwatch.你一到达目的地,就走出飞机并重新设置手表时间。
  • He is recovering from an operation to reset his arm.他做了一个手臂复位手术,正在恢复。
9 celestial 4rUz8     
adj.天体的;天上的
参考例句:
  • The rosy light yet beamed like a celestial dawn.玫瑰色的红光依然象天上的朝霞一样绚丽。
  • Gravity governs the motions of celestial bodies.万有引力控制着天体的运动。
10 beleaguered 91206cc7aa6944d764745938d913fa79     
adj.受到围困[围攻]的;包围的v.围攻( beleaguer的过去式和过去分词);困扰;骚扰
参考例句:
  • The beleaguered party leader was forced to resign. 那位饱受指责的政党领导人被迫辞职。
  • We are beleaguered by problems. 我们被许多困难所困扰。 来自《简明英汉词典》
11 landmarks 746a744ae0fc201cc2f97ab777d21b8c     
n.陆标( landmark的名词复数 );目标;(标志重要阶段的)里程碑 ~ (in sth);有历史意义的建筑物(或遗址)
参考例句:
  • The book stands out as one of the notable landmarks in the progress of modern science. 这部著作是现代科学发展史上著名的里程碑之一。 来自《现代汉英综合大词典》
  • The baby was one of the big landmarks in our relationship. 孩子的出世是我们俩关系中的一个重要转折点。 来自辞典例句
12 situated JiYzBH     
adj.坐落在...的,处于某种境地的
参考例句:
  • The village is situated at the margin of a forest.村子位于森林的边缘。
  • She is awkwardly situated.她的处境困难。
13 backwards BP9ya     
adv.往回地,向原处,倒,相反,前后倒置地
参考例句:
  • He turned on the light and began to pace backwards and forwards.他打开电灯并开始走来走去。
  • All the girls fell over backwards to get the party ready.姑娘们迫不及待地为聚会做准备。
14 transcript JgpzUp     
n.抄本,誊本,副本,肄业证书
参考例句:
  • A transcript of the tapes was presented as evidence in court.一份录音带的文字本作为证据被呈交法庭。
  • They wouldn't let me have a transcript of the interview.他们拒绝给我一份采访的文字整理稿。

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