科罗拉多昆虫减少,殃及池鱼 分享到
Scientists Help Insects to Help Colorado River Fish 2018-05-1247185

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文章摘要:科罗拉多昆虫减少,殃及池鱼,诛心之论香港媒体作对,用逸待劳戴耳环九泉。

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Fish need insects for food. So, healthy rivers have healthy insect populations.However, in the United States, part of the Colorado River has an insect shortage that has left many fish without food.
鱼以昆虫为食,因此,丰饶的河流必然昆虫众多。但是,在美国,科罗拉多河部分流域昆虫短缺,导致许多鱼没有食物。
Researchers are hoping a month-long water-flow experiment will improve the situation. The U.S. Geological Survey project involves the release of low, continuous water flow from Glen Canyon Dam. This will give insect eggs, which they lay just below the water’s surface, a better chance to survive.
研究人员期望在为期一个月的水流实验后,这种状况能够得到改善。美国地质勘察项目包含了把葛兰峡谷大坝中的低水位水流释放。这会带来昆虫虫卵,昆虫把虫卵下在水流的表面上,这样虫卵存活的几率更高。
The Colorado runs 2,330 kilometers from the Rocky Mountains of Colorado to Lake Mead, on the border between the states of Arizona and Nevada. The Glen Canyon Dam is near the border between the states of Utah and Arizona.
科罗拉多河全长2330千米,从落基山脉流入亚利桑那州与内华达州交界处的米德湖。葛兰峡谷大坝靠近犹他州与亚利桑那州交界的地方。
For whatever reason, downstream of Glen Canyon Dam really lacks diversity, said Scott VanderKooi, who runs the U.S. Geological Survey’s Grand Canyon Monitoring and Research Center in Flagstaff.
“不管出于什么原因,葛兰峡谷大坝下游的确缺乏生物多样性,”斯科特·万德库伊说道,他在弗拉格斯塔夫经营美国地质勘察下大峡谷监察与研究中心。
Scientists expect a 26 percent increase in insects, such as black flies and midges, by next summer. Scientists say that when insect populations grow, so do the populations of other animals such as fish, bats, birds and other insect eaters.
科学家预期到明年夏天,双色球各期开奖号码:昆虫将会增长26%,比如黑蝇与蚊子。科学家称,随着昆虫数量增长,其他动物数量也会增长,比如说鱼、蝙蝠和其他吃昆虫的动物。
Insects attach their eggs to hard surfaces, such as rocks or wood, on riversides. As water from dams rises and falls the eggs can lose their cover and dry out.
昆虫把卵产在坚硬的物体表面,像河边上的石头或是树木。随着大坝水位的升降,虫卵会失去覆盖物并干涸。
If they remain above the water line for even an hour, they die, said Jeff Muehlbauer, a research scientist with the Geological Survey.
虫卵置于水位线上一个小时就会死亡,杰夫·米尔鲍尔如是说,他是地质勘探项目的一名研究员。
The water flows are part of a larger plan approved in late 2016 for operations at Glen Canyon Dam to improve fish life. The dam holds back Lake Powell.
在2016年下半年通过的一项更大的计划中,包括使用葛兰峡谷大坝的水流来改善鱼类生活,大坝拦截了水流形成了鲍威尔湖。
John Hamill, a volunteer with the organization Trout Unlimited, says the experiments will help explain the current situation of all the different river resources. Then, officials can make changes based on how the river ecosystem is changing.
约翰·哈米尔是“鳟鱼无限”组织的一名志愿者,他说借助过去的经验,可以解释所有河流资源的现状。然后,官员可以根据河流生态系统的改变做出相应的调整。
People often fish along a 25-kilometer run of the Colorado River below the dam. However, a lack of insects means some of the fish caught are smaller than normal. Hamill says this has caused a lot of people to fish in different places.
大坝下游25千米长的科罗拉多流域常有人捕鱼。然而,昆虫短缺意味着一些抓到的鱼也比正常的鱼个头更小。哈米尔说这导致很多人在不同的地方捕鱼。
It hasn’t been a very dependable fishery, Hamill said.
哈米尔说,“这种渔业靠不住”。
Ted Kennedy started working at the Geological Survey in 2002. He said at that time scientists had noted the low number of flies and other insects throughout the Grand Canyon.
泰德·肯尼迪从2002年开始在地质勘察项目工作。他说那时候科学家就注意到科罗拉多大峡谷中蝴蝶和其他昆虫数量不多。
Kennedy began studying the lives of insects before they hatch. He asked river guides and students for help studying the adult insect life as well.
肯尼迪开始研究昆虫孵化前的生活,并向河流向导与学生寻求帮助以研究成年昆虫的生活。
Since 2012, the volunteers have set out plastic containers for an hour each night. A special light is attached that leads the insects into the containers.
2012年以来,自愿者每晚都会把塑料容器放置一个小时,容器上附有一盏特殊的灯,引导昆虫进入容器。
The evidence from the containers showed researchers that fish in the area have a weak food source. This problem leads to fish that are longer, thinner, do not swim well, and do not have the energy to reproduce or fight.
容器中的证据向研究人员表明,该区域鱼的食物来源很少,这就导致那些更长更瘦的鱼不善游泳,也没有能力繁衍或是斗争。
The U.S. Geological Survey scientist Ted Kennedy said, "When things are bad for midges, there’s not much else to take its place."
美国地质勘察科学家泰德说,“当小虫的处境变糟,就没有什么可以代替它了。”
I’m Phil Dierking.
菲尔·迪尔金报道。

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