The wild world of carnivorous plants - Kenny Coogan

2,247,208 views ・ 2019-04-11

TED-Ed


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翻译人员: Carol Wang 校对人员: GeGe Tan
00:08
Little do they know it,
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尽管它们毫无察觉,
00:09
but these six creatures are each about to experience a very unusual death.
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但这六种生物都将以一种 十分不寻常的方式死亡。
00:15
One-by-one,
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一个接着一个,
00:16
they will fall prey to the remarkable, predatory antics of...
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它们将成为奇特猎食者的盘中餐……
00:20
a carnivorous plant.
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食肉植物。
00:22
Around the world there are more than 600 plant species
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全世界有多于 600 种植物
00:26
that supplement a regular diet of sunlight, water, and soil
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除了需要阳光、 水和土壤这些常规“饮食”外,
00:30
with insects, microbes, or even frogs and rats.
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还“吃”昆虫、微生物、 甚至青蛙和老鼠。
00:35
Scientists believe that carnivory in plants evolved separately
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科学家们相信,地球上 植物的食肉性的进化
00:40
at least six times on our planet,
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独立上演过至少六次,
00:42
suggesting that this flesh-munching adaptation
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这说明这种食肉的适应性
00:45
holds a major benefit for plants.
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为植物提供了极大益处。
00:48
Carnivorous plants tend to grow in places with highly acidic soil,
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食肉植物常生长在强酸性土壤处,
00:53
which is poor in crucial nutrients like nitrogen, phosphorus, and potassium.
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这种土壤缺乏如氮、磷、钾等重要养分。
00:59
In these hostile conditions,
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在这种恶劣的环境中,
01:01
plants that are able to lure, trap, and digest prey
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能吸引、捕杀和消化猎物的植物
01:05
have an advantage over those that rely on soil for their nutrients.
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比单纯依赖土壤的植物更具优势。
01:10
Take this inhospitable bog,
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以这片荒凉的沼泽地为例,
01:13
where pitcher plants reign supreme.
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猪笼草在这里生长茂盛。
01:15
Drawn to the pitcher’s vivid colors and alluring scent,
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这只苍蝇被猪笼草的艳丽颜色 和诱人气味所吸引,
01:19
the fly closes in and slurps its nectar.
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它靠近猪笼草并啜饮其花蜜。
01:22
But this pitcher species has an ingredient called coniine in its nectar,
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但这种猪笼草的花蜜中 含有一种成分叫毒芹碱,
01:27
a powerful narcotic to insects.
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是一种强大的昆虫麻醉剂。
01:30
As the coniine takes effect,
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当毒芹碱生效时,
01:32
the fly grows sluggish, stumbles, and falls down the funnel
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苍蝇变得迟钝、蹒跚,
01:37
into a pool of liquid at the base,
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跌入捕虫笼底部的一池液体,
01:39
where he drowns.
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最后淹死于此。
01:41
Enzymes and bacteria in the liquid slowly break his body down
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液体中的酶和细菌 慢慢将它的身体分解成
01:46
into microscopic particles the pitcher plant can consume through its leaves.
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猪笼草的叶子可以吸收的微观颗粒。
01:51
Occasionally,
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偶尔地,
01:52
larger prey also tumbles into the fatal funnel of the pitcher plant.
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也有较大猎物坠入 猪笼草那致命的捕虫笼中。
01:57
The second victim faces off with the sticky sundew plant.
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第二个受害者遇到了黏黏的茅膏菜。
02:02
The sundew’s tiny leaves are equipped with a viscous secretion called mucilage.
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茅膏菜的小叶上 带有黏分泌物:粘液。
02:08
The ant is swiftly trapped in this goo.
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这只蚂蚁很快被粘性物困住了。
02:11
As she struggles, enzymes begin to digest her body.
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当她挣扎的时候, 酶已开始消化她的身体。
02:15
Special tentacles sense her movement and curl around her,
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独特的触须感知到其活动, 并在她周身缠绕收紧,
02:19
clenching her in their suffocating grip.
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令人窒息地挤压着她。
02:22
Once she asphyxiates,
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一小时内,
02:23
which can happen in under an hour,
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一旦她窒息后,
02:25
the tentacles unfurl again to snare their next victim.
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这些触须再次松开, 以便诱捕下一个受害者。
02:30
Two down, four to go.
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已经牺牲 2 个,还剩 4 个。
02:32
The next target meets his end underground,
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下一个目标将死于长在地下
02:35
in the coils of the corkscrew plant.
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螺旋植物的缠绕中。
02:38
He enters the roots through a tiny slit in search of food.
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他为找食物而钻入根部小切口,
02:42
But inside, he quickly loses his way through the tangled labyrinth.
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但很快便迷失在那错综复杂的迷宫里。
02:47
A forest of curved hairs prevents his escape,
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密集的卷毛让他无法逃走,
02:50
guiding him into a central chamber with flesh-digesting enzymes
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将他引至中心腔室, 里面有消化血肉的酶,
02:55
and deadly low levels of oxygen.
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且那里氧气水平非常低。
02:59
In the murky depths of a nearby pond,
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在附近池塘的阴暗深处,
03:02
a tadpole unwittingly swims into the path of the bladderwort,
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一只蝌蚪不知不觉地 游进了狸藻的地盘,
03:07
the speediest of all carnivorous plants.
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狸藻是食肉植物中消化最快的。
03:10
She treads on the bladderwort’s trigger,
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她触及到狸藻的触须,
03:13
and in milliseconds,
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仅在几毫秒内,
03:14
a trapdoor swings open and sucks her in.
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活板门打开,她被吸了进去。
03:17
Trapped half in and half out,
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身体一半困在里面,一半在外,
03:20
she struggles to free herself
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她努力想挣脱,
03:22
while the part of her body inside the plant gets digested.
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但她在植物内的身体已被消化。
03:27
Over the next few hours,
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在接下来的几个小时里,
03:28
her writhing sets the trap off repeatedly,
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她的扭动反复地打开活板门,
03:31
each time bringing her deeper into the plant
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每次都让更多的身体进入,
03:34
to be digested alive bit by bit.
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一点一点地活着被消化掉了。
03:38
Meanwhile, this beetle is bewitched by sweet-smelling nectar.
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与此同时,这只甲虫 被甜美的花蜜所迷惑。
03:42
The scent draws him closer and closer
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气味吸引他越来越靠近,
03:44
until he lands on the leaves of the world’s most infamous carnivorous plant.
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直到他落在世上最臭名昭著的 食肉植物的叶子上。
03:50
His landing triggers tiny hairs on the surface of the leaves,
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他的降落触发了叶表的微小毛发,
03:54
and the jaws of the venus fly trap snap shut around him.
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捕蝇草的捕虫夹在他周围快速闭合,
03:58
The spikes interlock to seal his fate.
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刺毛互锁决定了他的命运。
04:01
Once closed,
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一旦闭合,
04:02
the leaves act like an external stomach that digests the beetle’s soft tissues.
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叶子就像一个外部胃, 消化掉甲虫的软组织。
04:08
When they open again a few days later,
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当几天后叶子再次打开时,
04:11
only the dry husk of his exoskeleton remains.
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只剩下他干枯的外骨骼外壳。
04:15
The mayfly is the last creature standing.
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最后的生物是蜉蝣。
04:18
As she approaches the butterwort plant,
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当她靠近捕虫堇时,
04:21
she heads for the flowers that wave high above the plant’s globs of adhesive goo.
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她飞向了团团粘液上方、 高高摇曳的花朵。
04:27
She alights on the petals, drinks the nectar, and takes off unscathed.
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她落在花瓣上,喝完花蜜, 毫发无伤地飞走了。
04:32
These long flower stalks keep certain insects away from the carnivore’s traps—
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这些长花茎使某些昆虫 远离食肉植物的陷阱——
04:37
a way of separating pollinators from food.
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一种将授粉者与猎物分开的方法。
04:41
Off the mayfly buzzes to live a long and fruitful life–
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蜉蝣翁嗡飞走了, 去过漫长而多姿的一生——
04:46
oh.
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噢!
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