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  3. 共用题干 第三篇Ants Have Big Impact on Environment as " Ecosystem Engineers"Resea...Wh

共用题干 第三篇Ants Have Big Impact on Environment as " Ecosystem Engineers"Resea...Wh

admin2020-12-24  7
问题 共用题干
第三篇

Ants Have Big Impact on Environment as " Ecosystem Engineers"

Research by the University of Exeter has revealed that ants have a big impact on their local environment
as a result of their activity as"ecosystem engineers"and predators.The study,published in the Journal of
Animal Ecology,found that ants have two distinct effects on their local environment?
Firstly.throuah moving the soil by nest building activity and by collecting food they affect the level of
nutrients in the soil.This can indirectly impact the local populations of many animal groups,from decomposers
to species much higher up the food chain.
Secondly,they prey on a wide range of other animals,including larger prey which can be attacked by
vast numbers of ant workers.
Dirk Sanders,an author of the study from the university's Centre for Ecology and Conservation,said,
"Ants are very effective predators which thrive in huge numbers.They're also very territorial and very ag-
gressive,defending their resources and territory against other predators.All of this means they have a strong
influence on their surrounding area."
"In this research,we studied for the first time how big this impact is and the subtleties of it.What we
found is that despite being predators,their presence can also lead to an increase in density and diversity of
other animal groups.They genuinely play a key role in the local environment,having a big influence on the
grassland food web,"Sanders said.
The study,carried out in Germany,studied the impact of the presence of different combinations and den-
sities of black garden ants and common red ants,both of which can be found across Europe,including the
UK. It found that a low density of ants in an area increased the diversity and density of other animals in the
local area,particularly the density of herbivores and decomposers.At higher densities ants had no or the op-
posite effect,the predation counteracting the positive influence.
Dr Frank van Veen,another author on the study,said:"What we find is that the impact of ants on soil
nutrient levels has a positive effect on animal groups at low levels,but as the number of ants increases,their
predatory impacts have the bigger effect一thereby counteracting the positive influence via ecosystem
engineering.
Ants are important components of the ecosystem not only because they constitute a great part of the ani--
mal biomass but also because they act as ecosystem engineers.Ant biodiversity is incredibly high and these
organisms are highly responsive to human impact,which obviously reduces its richness.However,it is not
clear how such disturbance damages the maintenance of ant services to the ecosystem.Ants are important in
below ground processes through the alteration of the physical and chemical environment and through their
effects on plants,microorganisms,and other soil organisms.
选项 What does Paragraph 6 tell us?
A:Ants bring about a negative influence to an area when their population is small.
B:Ants bring about a positive influence to an area when their population is small.
C:Ants'predation counteracts the positive influence they may have on an area.
D:At higher density,ants produce a positive influence on an area.
答案B
解析由短文的第一段第一句可知答案为C项。
答案能够从短文的第三段直接找到。该段告诉我们，蚂蚁的捕食范围很广，甚至包括比它们体积大的动物。
短文第五段中Dirk Sanders说：" In this research , we studied for the first time how big this impact is and the subtleties of it.”所以，D是正确选项。句中“the subtleties of it”的意思是：（蚂 蚁对环境）影响的精妙之处。
短文第六段第二句的大概意思是，蚂蚁数量小（a low density of ants）的话，能使其他动 物的品种和数量增加（increased the diversity and density of other animals)，从而给环境带来积极 影响；第三句说，如果蚂蚁的数量大（At higher densities)，就会没有影响或者有相反的影响。
最后一段的第二和第三句提供了答案。第二句告诉我们，蚂蚁极易受人类的影响 ( these organisms are highly responsive to human impact)，第三句告诉我们，科学家还不清楚人类 对蚂蚁的这种干扰如何破坏蚂蚁对生态系统的维护作用（it is not clear how such disturbance damages the maintenance of ant services to the ecosystem）。
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