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科学美国人60秒:北极的授粉使者苍蝇面临不确定的未来

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This is Scientific American — 60-Second Science. I'm Christopher Intagliata.
The Greenland High Arctic is a bare, sparse place. Rather than tall trees, it has tundra—ground hugging vegetation—and rugged, Lord-of-the-Rings-style vistas. "Well I don't know, it's not exactly New Zealand, but kind of similar landscape."
Mikko Tiusanen, an ecologist at Helsinki University in Finland. "The winter season is like six, seven months. So everything basically happens during the short summer season." Including the white-yellow bloom of mountain avens, a hardy arctic shrub. "Even though it's small it can be over 100 yrs old. It's pretty good at surviving harsh conditions."
Tiusanen and his colleagues set out to census which of the many local insects visit mountain avens by summer, and help with pollination. So they planted 2100 sticky flower lookalikes, as traps, and identified stuck visitors by their DNA.

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Two-thirds of all local insect species visited. But it was one particular fly, a relative of the humble housefly, that showed up most often in those spots where the tundra shrubs had successfully set seed. Meaning more flies appeared to be a good thing for the avens. The study appears in the Proceedings of the Royal Society: B.
Here's the bad news: a 2013 study found that the Arctic flowering season is shortening. The numbers of fly pollinators is down, as is the the number of visits by these fly pollinators. Which could be bad for mountain avens—and beyond. "One could expect that also the other pollinators and flower visitors visiting the mountain avens could get more uncommon and even become extinct in the long run." Meaning "shoo fly" could spell trouble for the life of the tundra.
Thanks for listening for Scientific American — 60-Second Science Science. I'm Christopher Intagliata.

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harsh [hɑ:ʃ]

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adj. 粗糙的,使人不舒服的,刺耳的,严厉的,大约的

 
uncommon [ʌn'kɔmən]

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adj. 不寻常的,不凡的,罕有的

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remove [ri'mu:v]

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v. 消除,除去,脱掉,搬迁
n. 去除

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species ['spi:ʃiz]

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n. (单复同)物种,种类

 
sticky ['stiki]

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adj. 粘的,闷热的,困难的,令人不满意的

 
humble ['hʌmbl]

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adj. 卑下的,谦逊的,粗陋的
vt. 使

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shrub [ʃrʌb]

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n. 灌木
n. 果汁甜酒

 
ecologist [i:'kɔlədʒist]

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n. 生态学家

 
particular [pə'tikjulə]

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adj. 特殊的,特别的,特定的,挑剔的
n.

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sparse [spɑ:s]

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adj. 稀少的,稀疏的

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