时间:2019-02-24 作者:英语课 分类:英语听力文摘 English Digest


英语课
Males Rule in Costa Rican Wasp Species
哥斯达黎加父系制度的黄蜂



In most species of social insects, such as wasps, bees, and ants, the females rule. The females are the workers. They are the ones to go out and get the food, and they are also the ones to care for the queen, the larvae, and the nest in general. The males of these species of insects are typically lazy, and they bear the brunt of much abuse. They’re sometimes bitten, fed scraps 1, and chased out of the home for good by their sisters not long after they’re born.


Not only that, but among paper wasps in the United States the females practice what scientists call “male stuffing.” When a worker brings food home to the nest, her sisters shove their brothers headfirst into empty nest cells to prevent them from consuming any of the food.


Behavior like this, however, is reversed in a Costa Rican wasp species. The males in this species not only attack their sisters, who curl into submissive positions or flee, but they steal food from the queen herself, their very own mother.


These wasps live in a cloud forest in Costa Rica. Whereas wasp colonies in temperatezones can only reproduce for a brief period in the summer, these colonies can mate year round. Thus, a scientist studying these wasps proposes that it’s in the females’ interest to put up with the abuse of their brothers and to let them hang around longer because it increases the males chances of mating with queens from other nests, which makes the colony more biologically fit.



群居昆虫中大多奉行母系制度,比如黄蜂、蜜蜂、蚂蚁。群体里的工蜂是负责外出寻觅食物、照顾蜂王及幼虫并守卫蜂巢。而雄蜂通常都游手好闲,因此招来骂声一片。雄蜂有时候会被欺负,食不果腹,出生后不久被雌蜂赶出蜂巢觅食。


科学家发现美国胡蜂群体里的雌蜂盛行的是“包夹雄蜂”。当工蜂运送食物回蜂巢,雌蜂就把雄蜂头挡在空蜂房里,不让雄蜂享受劳动果实。


但是,在哥斯达黎加黄蜂却恰好相反。雄蜂不但围攻雌蜂,还从蜂王那里偷食物,蜂王可是他们的亲生母亲啊!雌蜂只得缩成一团或逃跑。


这类黄蜂居住在哥斯达黎加的雾林中。温带黄蜂只在夏天很短的一段时间繁衍后代,而这种黄蜂终年交配。研究这类黄蜂的科学家推断,雌蜂对雄蜂的放任自流是忍辱负重,为其它蜂巢的蜂王制造更多交配机会,顺应物种繁衍。


 shove:推,挤




 



油渣
  • Don't litter up the floor with scraps of paper. 不要在地板上乱扔纸屑。
  • A patchwork quilt is a good way of using up scraps of material. 做杂拼花布棉被是利用零碎布料的好办法。
学英语单词
abrasion plain
acid-houses
acuminate papular syphilid
adsorbabilities
allegorisation
anionwu
antidotarium
Aschcff's node
block chain sprocket rack type cutter
branch-bound algorithm
brittle temperature
bumped head
capacity factor of equipment
chaetolauxania sternopleuralis
chancered
circumspectively
Clesidren
complementary submatrix
compression diffuser
control rod position
conveyanced
Cornarin
credit reference
cudde
cylinder type absorber
denmarks
discriminative stimuluss
dome-shaped contact
doorpeople
doughnut antenna
drynurse
ermineous
exemplificate
fast program loading
feline agranulocytosis
fibre-glide bearing
five-year survival rate
for his part
globotriosyl
glossokinesthetic center
go to blows
Gresols
half the fun
hanging clinometer
hardening at subcritical temperature
hectoliter
Holopogon smithianus
intercarrier beat
internal ears
irreversive
Kahn tests
Kuznetsovskiy
lamellar collenchyma
lashers
length for heading
manual switchgroup
mesomorphic phases
middle-age
molarize
multiple band receiver
myotonia acquisita
Nianié
nitrate pyrolysis
normalized parameter
notch sensitivity ratio
nuclear projectile
oligohydria
organosulphurs
overflow chain
overtipped
papilledemas
plasma-derived
playback apparatus
praen
prairie wagons
qualiftying category
Rhododendron semilunatum
roleplayed
rubber stereotype
Saint Maarten
sex
shellside pressure drop
silver-black
skim milk concentrate
social gospel
speak for sb
spring born work arbor
storage class attribute with structures
stress function of bending
Sydney-siders
time of unconsciousness
titrameter
tridecanoic
TyrD
undissociable
unyieldly
Vesper
vibrational state
vibrio commas
Victoria Nyanza
water well
Wires charge