At picnics, ants are pests. But they have their uses. In industries such as mining, farming and forestry, they can help gauge the health of the environment by just crawling around and being antsy. It has been recognized for decades that ants--which are highly sensitive to ecological change—can provide a near-percent barometer of the state of an ecosystem. Only certain species, for instance, will continue to thrive at a forest site that has been cleared of trees. (41) And still others will move in and take up residence. By looking at which species populate a deforested area, scientists can determine how "stressed" the land is. (42) Ants are used simply because the>; are so common and comprise so many species. Where mine sites are being restored, for example, some ant species will recolonize the stripped land more quickly than others. (43) Australian mining company Capricorn Coal Management has been successfully using ant surveys for years to determine the rate of recovery of land that it is replanting near its German Creek mine in Queensland. Ant surveys also have been used with mine-site recovery projects in Africa and Brazil, where warm climates encourage dense and diverse ant populations. "We found it worked extremely well there,’ says Jonathan Majer, a professor of environmental biology. Yet the surveys are perfectly suited to climates throughout Asia, he says, because ants are so common throughout the region. As Majer puts it. "That’s the great thing about ants.’ Ant surveys are so highly-regarded as ecological indicators that governments worldwide accept their results when assessing the environmental impact of mining and tree harvesting. (44) . Why not Because many companies can’t afford the expense or the laboratory time needed to sift results for a comprehensive survey. The cost stems, also, from the scarcity of ant specialists. (45) . [A] This allowed scientists to gauge the pace and progress of the ecological recovery. [B] Yet in other businesses, such as farming and property development, ant surveys aren’t used widely. [C] Employing those people are expensive. [D] They do this by sorting the ants, counting their numbers and comparing the results with those of earlier surveys. [E] The evolution of ant species may have a strong impact on our ecosystem. [F] Others will die out for lack of food.’ [G] Gretaceous ants shared a couple of wasp-like traits together with modern ant-like characteristics.
At picnics, ants are pests. But they have their uses. In industries such as mining, farming and forestry, they can help gauge the health of the environment by just crawling around and being antsy.
It has been recognized for decades that ants--which are highly sensitive to ecological change—can provide a near-percent barometer of the state of an ecosystem. Only certain species, for instance, will continue to thrive at a forest site that has been cleared of trees. (41) And still others will move in and take up residence.
By looking at which species populate a deforested area, scientists can determine how "stressed" the land is. (42) Ants are used simply because the>; are so common and comprise so many species.
Where mine sites are being restored, for example, some ant species will recolonize the stripped land more quickly than others. (43) Australian mining company Capricorn Coal Management has been successfully using ant surveys for years to determine the rate of recovery of land that it is replanting near its German Creek mine in Queensland. Ant surveys also have been used with mine-site recovery projects in Africa and Brazil, where warm climates encourage dense and diverse ant populations. "We found it worked extremely well there,’ says Jonathan Majer, a professor of environmental biology. Yet the surveys are perfectly suited to climates throughout Asia, he says, because ants are so common throughout the region. As Majer puts it. "That’s the great thing about ants.’
Ant surveys are so highly-regarded as ecological indicators that governments worldwide accept their results when assessing the environmental impact of mining and tree harvesting. (44) .
Why not Because many companies can’t afford the expense or the laboratory time needed to sift results for a comprehensive survey. The cost stems, also, from the scarcity of ant specialists. (45) .
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对拟验收的单位工程,总监理工程师组织验收合格后对承包单位的《工程竣工报验单》予以签认,并上报建设单位,同时提出“工程质量评估报告”,“工程质量评估报告”要由( )共同签署
A . 建设单位、设计单位、施工单位、监理单位B . 总监理工程师、监理单位技术负责人C . 项目经理、总监理工程师D . 建设单位项目负责人、项目经理、总监理工程师
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配位滴定法测定自来水的硬度,在pH 10的条件下,用EDTA溶液滴定到终点,消耗体积为V,V是( )消耗的EDTA体积
A. 钙离子 B. 钙、镁离子 C. 镁离子 D. 都可能
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