Population Ecology - 2

In what zone would there be lower levels of nutrients such as nitrogen and phosphorus, and why?

• In the surface zone (above 200m) because this is the only zone where producers are , and they absorb these nutrients

• In the twilight zone (200 - 1000m) because there is little light there, so the nutrients cannot be formed.

• It the no light zone (below 1000m) because of the total absence of light.

• The level of nitrogen and phosphorus is the same in all zones

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In what zone would life organisms that require and/or can tolerate high salinity levels, and why?

• In the no light zone (below 1000m), because the more salt a water has, the denser it is. Denser water sinks to the bottom.

• In the twilight zone (200 - 1000m) the saltier water has intermediate density, so it will stay in middle waters

• It the light zone (above 200m) because the more salt a water has, the less dense it is. Less dense water floats.

• They would leave in any of the zones because salinity does not affect the density of water.

Ocean water contains dissolved salts. Which of the following processes of the water cycle would DECREASE the salinity of the ocean water?

• Heavy precipitations (heavy rain, snow)

• High rate of evaporation due to increased heat

• High rate of condensation due to decreased temperatures

• Heavy surface and groundwater flow

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In this Venn-diagram, what would you write in the space identified by the letter C? Choose ALL the correct options

• They all are changes in ecosystems and communities

• They all start with bare rocks (no soil)

• They all start with soil

• They all start with a disturbance like a fire

• They all end up forming a climax community (stable, mature community)

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This may cause a population to increase

• increase of food supply

• removal of predators

• removal of disease

• increase of competition

• decrease of space

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If a disease destroying barley plants in a field swept through an ecosystem, what would happen to the barley eating bird population in the the field ?

• The bird population would stay the same
• The bird population would infinitely increase
• The bird population would decrease

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The graph to the right shows the interaction of the wolf and moose populations on Isle Pekie. If the moose population continues to increase, the wolves' food supply will increase. What will most likely happen to the wolf population as a result?

• It will decrease.

• It will increase.

• It will remain the same.

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Primary or secondary ecological succession?

• 
• 

Pioneer species are the first

• trees to grow in an area that has been disturbed

• trees that replace the original trees after a forest fire

• organisms to live in previously uninhabited areas

• organisms to live in a forest canopy

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How is primary succession different from secondary succession?

• Primary succession starts with soil.

• Secondary succession start with bare rock.

• Primary succession starts with bare rock, with lichens and moss.

• Fire is an example of primary succession.