科普英语:蝴蝶的饮食对进化有何影响?

日期:2017-11-03 11:01:34 来源:大学生学习网

  梦见青蛇的案例分析  梦境描述:今早天快亮的时候,我梦见一条很大很长的青蛇啊,很漂亮,我在小路上走着,它在草丛里,我用棍子打它,它的尾巴的断了弹进我嘴里了,我就一直吐,我就拼命的跑,它也跟着我跑,我又用棍子把它跳起来,扔进水里,然后它就一直游,速度非常快,一会又跟着我后面跑,然后我跑回家啊,它也跟着我进了厨房,根本捉不住,然后一下子就被吓醒了,求知道的朋友解释下,我很害怕啊,现在都心有余悸啊,谢谢了。女士梦见啼鸣,说明你内心企盼自己自尊自爱、自立自强。网上投注彩票,(男性,32岁)梦境解析:游泳的梦,预示着好的运气即将降临到你的身上,暗示你会生意兴隆,爱情幸福。  梦见烂香蕉,预示有朋友令你失望,或者工作让你感到十分不称心。  梦见睡衣沾到蕃茄酱(沾污),表示你对性存有恐惧。  心理分析:梦中见到吃苹果表示具有获得知识的愿望。

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  看到玉米成熟,表示名望和财富,看到满仓贮藏的玉米,预示你最大的愿望即将实现。20多年探访人数翻30多倍,山西洪洞大槐树“寻根热”折射了什么?《梦林玄解》梦人以钱求买物,凶。  年轻女子梦见收到一束五彩的鲜花,预示将有很多人爱慕她。因此务必要留意你的对手针对你做出的行为,尽量避开他对你的攻击,这样便能化险为夷。

  梦见不友善的狗表示人际关系会恶化。  原版周公解梦  出售萝卜,主有凶。永利娱乐场手机登录梦与男子交刀,与女子交刀,皆主吉昌之事。《梦林玄解》  梦风发虎啸,大吉,文人梦此得举,常人梦此定主为人上人。

  梦见自己被狼狗咬但不疼,预示着你近期的运势不佳,容易和身边的朋友发生争吵,甚至会和朋友疏远,会影响到你的现实生活。人们在寻求自我以及生存世界的更多领悟时所跨出的每一步,都是人生之旅的组成部分。  梦中在飞翔中看到太阳,表示你的担心是毫无意义的,因为你害怕失败,但终将获得成功。如果小偷发现了你并攻击你,则暗示你最近有强烈的欲望。

梦见布块拼成的被罩,或是五彩的被子,表示你家庭生活充满欢乐。20多年探访人数翻30多倍,山西洪洞大槐树“寻根热”折射了什么?  梦见种豆子,暗示你对将来充满信心,有决心付出努力开创自己的事业。  例如,某年轻男子梦见自己是个大官,开车去视察,友现土地很荒凉,地都干裂了,上面的庄稼也枯萎了,当地的农民都穷得衣衫褴褛,于是他忍不住痛哭了。梦见鞋子丢了,灾难会临头。

  梦见拿刀杀人,通常见于年轻男性的梦中,而梦境画面的场景很可能与你曾经看过的暴力影视有关,让你的梦境显得特别的真实。  梦境解析:这是一个绝好的梦,这个梦说明做梦者将摆脱旧生活的阴影。宝马bmw博彩娱乐  原版周公解梦  二猪争头,事不成。  梦见买戒指,家里会有人结婚。

梦见我回到家中,走进院中,发现我家养了好几十头猪,肥肥壮壮的,看到这些,我忙问妈妈:妈,养了这些猪您太累了吧。小伙子梦见盖被子,会与恋人幸福相处。胎儿的出现,也是梦者可能存在着面对困难不能应付而表现出的退行行为,从现在退回到了胎儿期。  梦见撒网捕到很多鱼,预示你将要发大财,赚到大钱。

Why do some organisms within a single species have many offspring, while others have relatively few? A new study led by University of Minnesota researcher Emilie Snell-Rood finds that access to some nutrients may be a star player in shaping traits related to fitness such as fecundity and eye size over the long term. Given drastic increases in the availability of many nutrients due to the widespread use of fertilizers and road salts, the finding has important implications for agriculture and ecology. Snell-Rood and colleagues wanted to find out if different types of nutrients played a role in shaping the evolutionary history of five closely-related families of butterflies. "It's really hard to quantify diet," she says, noting that prior studies have provided coarse comparisons across animals -- for instance, carnivores versus herbivores. "We wanted to test the idea that nutrition shapes life history evolution at a finer level."

To do that, researchers correlated the nutrition of 96 different butterfly species' food with a broad range of phenotypic features such as eye size. The researchers looked at three elements in the butterflies' diets: nitrogen, sodium, and phosphorus. Nitrogen is a necessary nutrient for protein building, sodium is critical for proper functioning of muscle and nervous systems, and phosphorous is thought to be important for growth rate.

They found that butterfly species with nitrogen-rich diets tended to have larger numbers of eggs, though the eggs themselves were relatively smaller. They also found that diets high in both nitrogen and sodium probably led to the evolution of larger eyes. In butterflies, the visual system is important for finding both food and mates, such that larger eyed individuals have an evolutionary advantage.

Human activity impacts the balance of nutrients in the environment. For example, heavy farm fertilization and increasing atmospheric9 deposition are both driving up nitrogen concentration in the soil, while road salts are similarly increasing sodium content in some places. "We are changing evolutionary selection pressures on traits," said Snell-Rood. "Pests might be evolving to be more fecund because, on average, their diet is of higher quality."