时间:2018-12-24 作者:英语课 分类:2017年Scientific American(二)月


英语课

 


Humans aren't the only species that forms friendships. Lots of animals prefer to spend their time only with certain individuals. 


"It's all very well showing that you do get social relationships and social bonds forming, but why on earth would you form them in the first place?"


University of Exeter animal behavior researcher Rob Heathcote. He and his team wanted to find out what benefit animals derive 1 from close social relationships. To do it, they set out for the Caribbean island of Trinidad, home of a small freshwater fish called the Trinidadian guppy.


"These guppies live in environments that have tons of predators 3 around, so basically it really sucks to be a guppy. In some places they live, you'll be watching these shoals of guppies and a predator 2 is attacking them every twenty or thirty seconds or so." 


One common idea is that such animals form social groups to reduce the risk of being gobbled up. But Heathcote wanted to see whether the benefits of social living might come from the strength of individual social relationships rather than simple safety in numbers.


The researchers caught 240 female Trinidadian guppies and divided them into groups of fifteen, each group in its own small pool. While some of the fish were left alone, others were exposed to what looked like a predator—a doll version of a guppy-eating fish called a pike cichlid.


Those guppies exposed to the ersatz predator were more likely to establish stronger social bonds. But the groups formed by those guppies were on average smaller than the groups formed by the fish that were not exposed to predators. [Robert J. P. Heathcote et al., Fear of predation drives stable and differentiated 4 social relationships in guppies, in Scientific Reports]


Heathcote thinks that the tighter-knit friendships that come from small groups allow guppies to more effectively cooperate in their predator avoidance activities.


“You can either hang out with a load of guppies, and every time these predators attack, you're unlikely to be the one that gets eaten. But obviously the first thing that happens when you form a big shoal is that this attracts every single predator in the vicinity… The alternative is you can be inconspicuous in a small social groups of three [or] four individuals. Everyone's kind of looking out for each other, they've got each other's back."


So spending time with a few close friends could outweigh 5 the benefits of blending in with the crowd, particularly in dangerous situations. 


"Friendship," said Winnie the Pooh writer A. A. Milne through his character Christopher Robin 6, "is a very comforting thing to have." Especially when there's a big scary fish trying to eat you.


—Jason G. Goldman 



1 derive
v.取得;导出;引申;来自;源自;出自
  • We derive our sustenance from the land.我们从土地获取食物。
  • We shall derive much benefit from reading good novels.我们将从优秀小说中获得很大好处。
2 predator
n.捕食其它动物的动物;捕食者
  • The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
  • Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴,它是一种令人恐惧的捕食性动物。
3 predators
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
4 differentiated
区分,区别,辨别( differentiate的过去式和过去分词 ); 区别对待; 表明…间的差别,构成…间差别的特征
  • The development of mouse kidney tubules requires two kinds of differentiated cells. 小鼠肾小管的发育需要有两种分化的细胞。
  • In this enlargement, barley, alfalfa, and sugar beets can be differentiated. 在这张放大的照片上,大麦,苜蓿和甜菜都能被区分开。
5 outweigh
vt.比...更重,...更重要
  • The merits of your plan outweigh the defects.你制定的计划其优点胜过缺点。
  • One's merits outweigh one's short-comings.功大于过。
6 robin
n.知更鸟,红襟鸟
  • The robin is the messenger of spring.知更鸟是报春的使者。
  • We knew spring was coming as we had seen a robin.我们看见了一只知更鸟,知道春天要到了。
学英语单词
5-oxoprolinuria
across impact matrix
air circulating rate
all else being equal
ammorosine
antihaplons
arteria centralis retinae
attention-seeker
balaclava helmet
block bottom bag
blow-out of spark
boundary estimate message
brookners
Campo Esperanza
celith (celite)
chatter time
chemical drains collecting circuit
compound amount of l yuan
cornerly
cotillage
curcas oil
danya
DAZIX
determine to
discusin
drank to
dysgerminema
electronically tunable optical filter
endocardial heart tube
equine rhinopneumonitis
esoprone
ethyldiphenylphosphine
fathomes
Fifth Avenue
flare signal rocket
flexural center
gazpacho
general announcing system
giddy
greenway
guiding center approximation
Halo-kieserite
hayton
Hazelwood
heptacontagons
home submap
hook slide
hyper-threading
hyperspherical
inside dope
internal control objective
isometeoric line
It is quite another story.
ko chuang (ch'iang tsu)
lesser palatine nerves
lipoviroparticles
loopie
marine mammal oil
media interview
monochromattism
moquades
Mount Norris
mutually orthogonal
Nastenon
nudiflorous
occulation
odible
ohno
okinalin
orthogonal experiment
pelvic exenteration
pemphigus foliaceus antigen
phosphatidalserine
plexogenic
plicae interureterica
porokeratosis of toe
pre-commencement expenditure
pressure-tight casting
pseudoprostyle building
pull-off strength
range converter
reshaper
respond
romaics
rotation chuck
saw you
scortation
secondary finder
shootouts
side span
sine of the third order
sisler
spatial acuity
the quaternary
Triticum secale
UDPG-4-epimerase
uninitiate
uralenin
use to ...?
utility theory
vitreous silica fibre
West Wind Drift