首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Life has never been easy for just-hatched Magellanic penguins, but climate change is making it worse, according to a decades-lon
Life has never been easy for just-hatched Magellanic penguins, but climate change is making it worse, according to a decades-lon
admin
2017-04-29
59
问题
Life has never been easy for just-hatched Magellanic penguins, but climate change is making it worse, according to a decades-long study of the largest breeding colony of the birds. The chicks are already vulnerable to predation and starvation. Now, the study at Punta Tombo, Argentina, found that intense storms and warmer temperatures are increasingly taking a toll.
Climate scientists say more extreme weather, including wetter storms and more prolonged periods of heat and cold, is one impact of a climate that is changing because of emissions of greenhouse gases in the atmosphere. While monitoring the penguin colony, Dr. Boersma, a University of Washington scientist, and her colleagues also documented regional temperature changes and increases in the number of days with heavy rains. The study is one of the first to show a direct impact of climate change on seabirds. Most studies have looked at how warming temperatures affect animals indirectly, by altering predation patterns or food supplies. William J. Sydeman, senior scientist at the Farallon Institute in California, who was not involved in the research, said the study linked changes in climate, which occur on a scale of decades, to the daily scale of life in the colony.
The colony at Punta Tombo, in a temperate and relatively dry region about midway along Argentina’s coast, is home to about 200 000 breeding pairs of the penguins, which are about 15 inches tall. Dr. Boersma has been working there since 1982, with long-term support from the Wildlife Conservation Society. For this study, the researchers compiled data on nearly 3 500 chicks that they meticulously tracked by checking nests once or twice a day throughout the six-month breeding season, which starts in September. Typically, nearly two-thirds of hatchlings at the colony do not survive to leave the nest. In most years, the researchers found, starvation and predation—by other seabirds and small animals—caused the majority of the deaths. But they found that heavy storms killed birds in 13 of the 28 years of the study. In two years, storms were responsible for most of the deaths. Extreme heat killed more hatchlings as well, although the effect was less pronounced. Like other young birds, penguin hatchlings can die from hypothermia(体温过低)if their down gets wet. The birds are most vulnerable from about a week after hatching—before that they are largely protected by a parent—to about six weeks, when they develop waterproof plumage(全身羽毛). Since 1987, the number of breeding pairs in the colony has declined 24 percent, Dr. Boersma said. It is difficult to calculate how much of that decline can be attributed to storms and rain, she said. Dr. Boersma said the increasing frequency of heavy storms was most likely directly affecting other seabird species that were breeding in the region.
The collection of the young penguins’ data______.
选项
A、occurs during the breeding season
B、is most important on days of extreme weather
C、is largely carried out by the Wildlife Conservation Society
D、is the most difficult part during the course of the study
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/q3U7777K
0
大学英语六级
相关试题推荐
A、Therewillbetwomorepeoplethanexpected.B、Therewillbemuchfoodleftbecauseofacouple’sabsence.C、Thenumberofgue
Inmanystressfulsituationsthebody’sresponsescanimproveourperformance.Webecomemore【B1】______,morealert,betterabl
Chemistrydidnotemergeasascienceuntilafterthescientificrevolutionintheseventeenthcenturyandthenonlyratherslow
Goinghungryisamajorcontributortoillhealth,particularlyamongchildren,andanewreportrevealshowlong-lastingtheda
Receivingvisitorsandguestsisanimportantpartofthesecretary’sdailyroutineintheoffice.Thereisacertain【B1】______
Karaokemayneverbethesame,thankstoresearchbeingpresentedinNashvilledetailingthelatestfindingsineffortstocreat
中国书法(Chinesecalligraphy)是汉字的书写艺术,旨在在汉字的书写过程中体现线条和布局的美感。书法在中国古代具有重要的实用功能,是所有知识分子都必须掌握的技能,因此出现了大量优秀的书法家(calligrapher)与书法作品(callig
拙政园(theHumbleAdministrator’sGarden)位于苏州城北,是江南园林的典型代表,也是面积最大的古典山水园林,被誉为“中国园林之母”。
OnSaturday,BexarCountyDigitalLibrary—a$2.4million,4,000-square-footspacelocatedonthesouthsideofSanAntonio—opens
A、Itwassetupasawholesaler25yearsago.B、Itsoldcampingequipmentoriginally.C、Itbeganofferingholidays10yearsago.
随机试题
假设CPU执行某段程序时,950次从Cache得到数据,50次从主存得到数据,已知Cache存取周期为50ns,主存存取周期为200ns(设每次访问时,Cache访问与主存访问并发进行,如Cache命中则中断主存的访问)。求:Cache-主存系统的
A.cAMPB.cGMPC.单酰甘油D.二酰甘油能促进蛋白激酶C活性的第二信使是
女性,22岁,口服不详农药60ml后,呕吐,流涎,走路不稳,视物模糊,呼吸困难,口中有大蒜样气味。最重要的实验室检查是
某企业当月,固定资产原值200万元,累计折旧为60万元,固定资产减值准备40万元,则资产负债表中的“固定资产”项目是()。
国内某高校张教授2016年取得部分收入项目如下:(1)5月份出版了一本书稿,获得稿酬15000元,后因出版社添加印数,获得追加稿酬5000元。(2)9月份,教师节期间获得全国教学名师奖,获得教育部颁发的奖金50000元。(3)10月份取得5年期
WinRAR软件的作用有()。
2018年12月8日,“嫦娥四号”探测器在西昌卫星发射中心成功发射。下列关于“嫦娥四号”的说法不正确的是:
简述商业银行的主要资产业务。(东北财经大学2014真题)
Themoonwasobscuredbythickclouds.
Americansusemanyexpressionswiththeword"dog".PeopleintheUnitedStateslovetheirdogsandtreatthemwell.【B1】______H
最新回复
(
0
)