首页
登录
职称英语
The cycle of fluctuation in snowshoe hare populations is unusual among anima
The cycle of fluctuation in snowshoe hare populations is unusual among anima
游客
2024-01-10
40
管理
问题
The cycle of fluctuation in snowshoe hare populations is unusual among animal species in that it is remarkably regular—peaking every eight to eleven years—and broadly synchronized over a vast area. Declines from peak levels are initiated by markedly lower overwinter survival of young hares, sharp decreases in birth rates, and a declining survival rate for adult hares. The onset of population increases is brought about by greatly improved rates of survival and birth.
Some biologists hypothesize that the cycle begins when peak snowshoe hare populations exceed their winter food supply; resulting malnutrition triggers a population decline. As hare numbers fall, the ratio of predators to hares increases, as does the impact of predation on the hare population. This extends the decline beyond the period of winter food shortage. Hare scarcity then causes predator population declines, and with fewer predators and more abundant winter food, the hare population begins another cyclic increase. The high mobility of predators responding to local differences in hare abundance contributes to interregional synchrony. [br] The passage suggests that population fluctuations in many other animal species differ from those of the snowshoe hare in that population fluctuations in other species
选项
A、are less regular due to more erratic changes in predator levels
B、typically occur over a longer time period
C、are synchronized over larger areas
D、are less dependent on food availability
E、are typically less predictable
答案
E
解析
根据第一段第一句可知,北美野兔和其他物种之间的区别在于北美野兔的种群波动更加规律因而可以预测,因此选项E正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3349357.html
相关试题推荐
Earthquakes,volcaniceruptions,andunusualweatherhavecausedmanymorenatur
ThelargepopulationsandimpressiveculturalachievementsoftheAztecs,theMa
[img]2015m7x/ct_egreqj_egreqtbz1_0101_20151[/img]Thepopulationsofthefivemo
Thespatialdistributionofdifferentracialandethnicpopulations
Thespatialdistributionofdifferentracialandethnicpopulations
Thespatialdistributionofdifferentracialandethnicpopulations
Thespatialdistributionofdifferentracialandethnicpopulations
Thestudy’swarningthatmonkeypopulationsweredeclininginGuatemalaandMexi
Manyoftheunusualbehaviorsattributedtocrows—suchasdrinkingcoffeeorpre
Recentlyanunusuallyhighnumberofdolphinshavebeenfounddeadofinfectious
随机试题
Consumergroupsareprotestingagainsthigherpricesinthiscitynow.A、clothing
Thesizzlingstreamsofsunlightwerejustbeautifullyglimmeringdownonth
Eveniftheyproducednootherpositiveresult,theattacksontheLondonUn
WhatdoSharonandXiaoLiagreewasthestrongestaspectoftheirpresentation?
TheEthicalConsumerResearchAssociationwillprovideinformationtoshopperso
对腰椎的描述,错误的是()A.棘突宽,矢状位后伸 B.上关节突后缘有乳突相
列入国家药品标准的药品名称称为A.药品通用名 B.药品商品名 C.化学药品
关于证券投资的基本分析法,下列说法错误的是()。A.以经济学、金融学、财务管理
左边给定的是纸盒的外表面,下面哪一项能由它折叠而成? A.如上图所示 B.如
胃溃疡最常发生的部位在A、贲门旁 B、胃后壁 C、胃小弯 D、胃大弯 E
最新回复
(
0
)