首页
登录
职称英语
For most species of animals, the number of individuals in the species is inverse
For most species of animals, the number of individuals in the species is inverse
游客
2024-01-12
46
管理
问题
For most species of animals, the number of individuals in the species is inversely proportional to the average body size for members of the species: the smaller the body size, the larger the number of individual animals. The tamarin, a small South American monkey, breaks this rule. Of the ten primate species studied in Peru’s Manu National Park, for example, the two species of tamarins, saddle-backed and emperor, are the eighth and ninth least abundant, respectively. Only the pygmy marmoset, which is even smaller, is less abundant. The tamarin’s scarcity is not easily explained; it cannot be dismissed as a consequence of diet, because tamarins feed on the same mixture of fruit, nectar, and small prey as do several of their more numerous larger counterparts, including the two capuchins known as the squirrel monkey and the night monkey. Although the relative proportions of fruits consumed varies somewhat among species, it is hard to imagine that such subtle differences are crucial to understanding the relative rarity of tamarins.
To emphasize just how anomalously rare tamarins are, we can compare them to the other omnivorous primates in the community. In terms of numbers of individuals per square kilometer, they rank well below the two capuchins, the squirrel monkey and the night monkey. And in terms of biomass, or the total weight of the individuals that occupy a unit area of habitat, each tamarin species is present at only one-twentieth the mass of brown capuchins or one-tenth that of squirrel monkeys. To gain another perspective, consider the spatial requirements of tamarins. Tamarins are rigidly territorial, vigorously expelling any intruders that may stray within the sharply defined boundaries of their domains. Groups invest an appreciable part of their time and energy in patrolling their territorial boundaries, announcing their presence to their neighbors with shrill, sweeping cries. Such concerted territoriality is rather exceptional among primates, though the gibbons and siamangs of Asia show it, as do a few other New World species such as the titi and night monkeys. What is most surprising about tamarin territories is their size.
Titi monkeys routinely live within territories of 6 to 8 hectares, and night monkeys seldom defend more than 10 hectares, but tamarin groups routinely occupy areas of 30 to 120 hectares. Contrast this with the 1 to 2 hectares needed by the common North American gray squirrel, a nonterritorial mammal of about the same size. A group of tamarins uses about as much space as a troop of brown capuchins, though the latter weighs 15 times as much. Thus, in addition to being rare, tamarins require an amount of space that seems completely out of proportion to their size. [br] The author indicates that tamarin territories are
选项
A、surprisingly large
B、poorly situated
C、unusually abundant in food resources
D、incapable of supporting large troops of tamarins
E、larger in Peru than in other parts of South America
答案
A
解析
Supporting idea
This question depends on understanding what the passage says about tamarin territories. In the second paragraph, the passage claims that the most surprising thing about tamarins is the size of their territories, and it indicates how large these territories are by comparing them to the territories of certain other animals.
A Correct. The passage indicates that the size of tamarins’territories—large in comparison to the territories of several other species—is surprising.
B The passage gives no indication as to whether tamarin territories are poorly situated.
C Although the passage does discuss the tamarin diet, it does not indicate how abundant in food sources tamarin territories are.
D The passage does indicate that relatively few tamarins live per square kilometer, but it does not claim that this is so because the territories are incapable of supporting a larger number of tamarins. In fact, there is some suggestion that the territories would seem to be capable of supporting more, which is one reason the size of the territories is so surprising.
E The passage does not compare the size of tamarin territories in Peru to tamarin territories elsewhere in South America.
The correct answer is A.
转载请注明原文地址:https://tihaiku.com/zcyy/3357276.html
相关试题推荐
Ifathree-digitnumberisselectedatrandomfromtheintegers100to999,incl
Foranynumberswandz,w·z=w3z(8-w2).Ifbothzandw·zarepositivenumbers,
ListA,BandCmeansthelistofmultiplesofprimenumbers2,3,and5respect
Sixdifferentnumbersaretobeselectedfromthe(0,1,2,3,4,5,6)tocompos
Whatisthetotalnumberofdifferent5-digitintegersthatcontainallofthed
Thenumbers3,10,17,24,31and38arethefirstsixtermsofaninfinitesequ
Eachof5positivewholenumbersisatleast8.Theaverage(arithmeticmean)oft
Howmany3-digitnumbersbetween100and200haveadigitthatistheaverageof
Thenumbersinthelistaboveareorderedfromleasttogreatest.Ifthemedian
Inhowmanyofthewholenumbersbetween100and200doesthedigit6occurexac
随机试题
[originaltext]W:Areyougoingtofindajobagainthissummer?M:Yes,ofcour
--Whyareyoustaring?--I’veneverseen_______treebefore.A、kindofB、thatki
Thefollowingisaninstructionofarecipe.FriedC
交易者发现当年3月份的欧元/美元期货价格为1.1138,6月份的欧元/美元期货价格为1.1226,二者价差为88个点。交易者估计欧元/美元汇率将上涨,同时3月份
关于输卵管通液术的论述,正确的是A.手术时间应选择在月经周期3~7天 B.所用
西方最早的复调音乐产生在9世纪时期,被称为()。A.奥尔加农 B.华丽奥尔
下列可视为合格投资者的是( )。 Ⅰ.社会保障基金、企业年金等养老基金,慈善
《变电运维管理规定第3分册组合电器运维细则》:对于组合电器,变电站应配置与实际相
二尖瓣狭窄不会引起A.右心房增大 B.右心室增大 C.左心房增大 D.左心
某公司承接一座城市跨河桥A标,为上、下行分离的两幅桥,上部结构为现浇预应力混凝
最新回复
(
0
)