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D
Scientists at the University of Southampton have conducted a study that stresses the importance of studying a full range of lives when measuring the effect of environmental change-from tiny bacteria to large whales.
Lead researcher Luke Holman explains, "Typically,biodiversity and bio-geography studies focus on one group of species at a time, often animals Studying animals, protist(原生生物) and bacteria together gave us the chance to take a broader view of the sea ecosystem, We discovered remarkably consistent bio-geographic groupings for the three across the coastline-consistent with previously studied patterns, driven by regional currents."
The team took seawater in numerous areas along the length of the South Affrican coast, from the warmer seas of the east, to the cooler waters of the west and the medium temperatures in the south. The seawater was filtered, had environmental DNA drawn and performed complex lab analysis to show the diverse range of lives in particular areas. Results showed a broad range of sea animals along the coast, but with differences in species in warm, cold and medium temperature regions. This same pattern of difference was also shown in bacteria and protists.
Furthermore, the scientists found that temperature had the greatest effect on determining the diversity of animals and bacteria, whereas protists were more associated with chlorophyll concentration. The team also discovered that while al three groups were affected by human activity, this was not to the extent expected Luke said, "We hope our work encourages researchers to consider other groups of lives in bio-geographic assessments and sea protection and repair projects."
Moving forward,the team aims to learn more about the causes and consequences of global sea biodiversity change for all life, from bacteria and protists to fish and sea mammals.
12.What makes animals, protist and bacteria have consistent bio-geographic groupings?
A. Currents.
B. Temperature.
C. Chlorophyl1.
D. Human activities.
13. What does the third paragraph focus on?
A. Diversity of sea animal species.
B. Consistency in biodiversity patterns
C.Difference in seawater temperature.
D. Experiment methods and results.
14. What does Luke suggest for repair projects?
A. Protecting the sea system.
B. Focusing on human activities
C.Considering other life groups
D.Examining seawater temperatures.
15. Which column of a magazine is the text probably from?
A. Climate.
B.Environment.
C. Geography.
D.Animals.

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