Second brood for rare butterfly 稀有蝴蝶一年产卵两次
文章来源:未知 文章作者:meng 发布时间:2009-08-19 02:25 字体: [ ]  进入论坛

One of the UK's rarest butterflies has produced a second brood in what conservationists are describing as an extremely rare event.


A second appearance for the Duke of Burgundy could become more common
A second appearance for the Duke of Burgundy could become more common

A second generation of the endangered Duke of Burgundy butterfly has now been spotted1 in Gloucestershire - the furthest north recorded so far.

Normally the butterfly produces one generation a year, taking to the wing in late April.

But a second brood has been recorded in August in Gloucestershire.

The National Trust said this second generation, documented at Rodborough Common, was highly unexpected.

"I'd never expected to see this," said the National Trust's conservation adviser2 Matthew Oates.

"I've been butterflying for over 40 years. Butterflies push limits, they really do... this is a really significant moment for one of the Duke of Burgundy strongholds."

While in more southern areas of its range in Europe, the Duke of Burgundy produces a second brood in late summer, in the UK it usually has only one generation each year.

But the spring flight of the butterfly has been occurring increasingly early over the past 20 years, says the National Trust.

Sharp decline

Warmer weather has spurred caterpillars3(毛虫) to develop into pupae(蛹) and produce a second brood within weeks rather than emerging the following spring.

A warming climate, which could be behind the earlier emergence4 of the Duke of Burgundy, may make a second appearance of the butterfly a more common event in the future.

Nearly half the 60 species of butterfly once common throughout the British Isles5 are on the charity Butterfly Conservation's endangered list. Five have become extinct(灭绝).

The charity says it is currently most concerned about the Duke of Burgundy, which is characterised by its chequered(方格式的) orange and brown wings.

Butterfly Conservation has reported a sharp decline in its numbers of nearly 60% in the last decade.

"There are probably just 100 sites in the UK where you can find this butterfly," said Sam Ellis, head of regions for Butterfly Conservation.

"Most of these are located in the southern chalk(用粉笔写,记录) downlands of Southern England.

"But they have suffered worrying declines largely down to loss of their habitats, particularly flower rich grasslands6 and woodlands where the insects thrive(兴旺,繁荣). Many of those have been lost to intensive agriculture, modern forestry7 and urban sprawl8(地区的无计划扩张)."


1 spotted 7FEyj     
  • The milkman selected the spotted cows,from among a herd of two hundred.牛奶商从一群200头牛中选出有斑点的牛。
  • Sam's shop stocks short spotted socks.山姆的商店屯积了有斑点的短袜。
2 adviser HznziU     
  • They employed me as an adviser.他们聘请我当顾问。
  • Our department has engaged a foreign teacher as phonetic adviser.我们系已经聘请了一位外籍老师作为语音顾问。
3 caterpillars 7673bc2d84c4c7cba4a0eaec866310f4     
n.毛虫( caterpillar的名词复数 );履带
  • Caterpillars eat the young leaves of this plant. 毛毛虫吃这种植物的嫩叶。
  • Caterpillars change into butterflies or moths. 毛虫能变成蝴蝶或蛾子。 来自辞典例句
4 emergence 5p3xr     
  • The last decade saw the emergence of a dynamic economy.最近10年见证了经济增长的姿态。
  • Language emerges and develops with the emergence and development of society.语言是随着社会的产生而产生,随着社会的发展而发展的。
5 isles 4c841d3b2d643e7e26f4a3932a4a886a     
岛( isle的名词复数 )
  • the geology of the British Isles 不列颠群岛的地质
  • The boat left for the isles. 小船驶向那些小岛。
6 grasslands 72179cad53224d2f605476ff67a1d94c     
n.草原,牧场( grassland的名词复数 )
  • Songs were heard ringing loud and clear over the grasslands. 草原上扬起清亮激越的歌声。 来自《现代汉英综合大词典》
  • Grasslands have been broken and planted to wheat. 草原已经开垦出来,种上了小麦。 来自《简明英汉词典》
7 forestry 8iBxk     
  • At present, the Chinese forestry is being at a significant transforming period. 当前, 我国的林业正处于一个重大的转折时期。
  • Anhua is one of the key forestry counties in Hunan province. 安化县是湖南省重点林区县之一。
8 sprawl 2GZzx     
  • In our garden,bushes are allowed to sprawl as they will.在我们园子里,灌木丛爱怎么蔓延就怎么蔓延。
  • He is lying in a sprawl on the bed.他伸开四肢躺在床上。
TAG标签: brood butterfly rare