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
57
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] According to the passage, biologists have suggested which of the following about snowshoe hare population fluctuations?
选项
A、Their regularity is due to the persistent threat of malnourishment that young hares face.
B、They are similar in length to those of other species of hare.
C、Their synchrony can be partly explained by the ability of predators to change the areas in which they hunt.
D、Their variation from region to region is partly due to regional differences in the availability of alternate prey for predator.
E、Their regularity is due to the constant availability of the food sources hares rely on.
答案
C
解析
C正确,对应最后一句。
转载请注明原文地址:https://tihaiku.com/zcyy/3349358.html
相关试题推荐
Thespatialdistributionofdifferentracialandethnicpopulations
Thespatialdistributionofdifferentracialandethnicpopulations
Thespatialdistributionofdifferentracialandethnicpopulations
Thespatialdistributionofdifferentracialandethnicpopulations
Intheclassroom,Carolwasunusually______;ontheplayground,however,shebec
Althoughitisunusualtodenouncemuseum-goersfornotpainting,itisquiteco
Thecycleoffluctuationinsnowshoeharepopulationsisunusualamonganima
Thecycleoffluctuationinsnowshoeharepopulationsisunusualamonganima
Recentlyanunusuallyhighnumberofdolphinshavebeenfounddeadofinfect
Computerprogramsareunusualinthattheyarevirtuallytheonlyproductst
随机试题
WhenDidAidsBegin?Theyea
Despitealloftheadvancesinmedicine,healthcareprovidershaveneverbe
Ifthereisonethingthatcouldhalttheascentofsocialnetworks,itist
女性,30岁。右半结肠切除术后吻合口瘘,行肠外营养治疗。近日来每日补钠4.5g,
A.流通蒸气灭菌法B.紫外线灭菌法C.加热灭菌法D.辐射灭菌法E.气体灭菌法仅适
主变或母线停运、开关拒动造成五级电网事件的变电站是()变电站。一类$;$
数字表第4行中出现3次的数字对应的符号是:
在多工厂与多部门的大型公司中,采取集中采购还是分散采购,是一个重要的抉择,其中,
已知某负载无功功率Q=3kvar,功率因数为0.8,则其视在功率S为( )kV
道路施工的压实度检测方法较多,对于路基、基层可采用的方法有()。A、环刀法
最新回复
(
0
)