首页
登录
职称英语
Harp seals from Canada are showing up in the US waters in greater numbers an
Harp seals from Canada are showing up in the US waters in greater numbers an
游客
2024-04-29
27
管理
问题
Harp seals from Canada are showing up in the US waters in greater numbers and farther south than usual, and biologists want to know why.
Small numbers of juvenile harp seals are typically found each winter stranded along the coast of the northeastern USA. But this year, well over 100 adult harp seals — not juveniles —have been spotted, said Mendy Garron, regional marine mammal stranding coordinator for the National Oceanic and Atmospheric Administration(NOAA)in Gloucester. The sightings are reported by 14 seal stranding and rehabilitation(康复)organizations in New England and the Middle Atlantic states. "In some areas they’re reporting three times the normal number of sightings," Garron said. "This year, we’ve had four sightings of adult harp seals in North Carolina, which we’ve never had before. We typically don’t see them that far south. "
Seals are common in waters off the northeastern New England states, where the most abundant type is the harbor seal, with a population estimated at about 100 000, the last time they were surveyed a decade ago. Gray seals are the second most common seal. But those numbers are piddling(微不足道的)compared to the number of harp seals found in the northwest Atlantic. Canada’s Department of Fisheries and Oceans says 9 million of them can be found off Canada and Greenland.
A decade ago, harp seal sightings off Maine were rare, said Lynda Doughty, marine mammal stranding coordinator for the state Department of Marine Resources. The numbers have picked up the past few years, and this year there have been 40 documented sightings—more than double the number spotted last year. The harp seals are typically spotted on nearshore ledges and in coves and harbors, but they have also turned up in parking lots and backyards—and one was found on an oceanside golf course in Scarborough. The seals spend most of their time on ice—they are one of several varieties of so-called ice seals—and have made their way onto land across the snow and ice along Maine’s shores.
For now, there is no clear explanation for why more seals are showing up in the US waters, said Gordon Waring, who heads the seal program at NOAA’s fisheries science center in Woods Hole. They could be making their way south because of climatic conditions or perhaps in search of food, Waring said. "These animals are known to wander a lot," Waring said. "Whether they’re following food down or whatever, we don’t really have a good understanding of it."
Garron said she and the seal organizations will look at environmental trends, such as water temperatures, to see if it’s influencing the harp seal range. Regardless of the reason, biologists are taking notice, Doughty said. "We’re all kind of raising our eyes," she said. [br] Compared with this year, last year harp seals______.
选项
A、increased at a more rapid rate
B、were found in less than 20 sightings
C、were rarer and scattered in many places
D、were usually found on nearshore ledges
答案
B
解析
细节辨认题。文中说这个数量在过去几年一直上升,到今年为止已有40余处记载,比去年看到的两倍还多。说明在去年发现了不到20处,故应选B)。
转载请注明原文地址:https://tihaiku.com/zcyy/3576876.html
相关试题推荐
[originaltext]Venice,asmall,watersidecityinnortheastItaly,boilswit
[originaltext]Venice,asmall,watersidecityinnortheastItaly,boilswit
HowaddictedhasAmericabecometotelevision?Thenumbersaredisturbingbu
HowaddictedhasAmericabecometotelevision?Thenumbersaredisturbingbu
HowaddictedhasAmericabecometotelevision?Thenumbersaredisturbingbu
Lonelypeople,itseems,areatgreaterriskthanthegregarious(爱交际的)ofdev
Lonelypeople,itseems,areatgreaterriskthanthegregarious(爱交际的)ofdev
Lonelypeople,itseems,areatgreaterriskthanthegregarious(爱交际的)ofdev
HarpsealsfromCanadaareshowingupintheUSwatersingreaternumbersan
HarpsealsfromCanadaareshowingupintheUSwatersingreaternumbersan
随机试题
Theearliestformofartificiallightingwasfire,whichalsoprovidedwarmand
冠心病Ⅰ期的呼吸训练,错误的是A.主要指腹式呼吸 B.呼气和吸气之间要均匀连贯
①作为一种尚在实验室的全新网络技术和产品,其未来潜力也不应被________高估
河北省的气候为温带半湿润半干旱大陆性季风气候。
酒制当归的作用是A.降低酸味B.减低油性C.增强活血作用D.增强润肠作用E.增强
2021年1—4月份,全国规模以上工业企业实现营业收入37.78万亿元,同比增长
关于2012年中秋、国庆黄金周期间的旅游情况,下列说法正确的是:() A.
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
申请核定资质等级的物业服务企业,应当向工商注册所在地直辖市、设区的市级人民政府房
能治疗瘿瘤的药物有A.昆布 B.黄药子 C.海蛤壳 D.瓦楞子
最新回复
(
0
)