Exam 18: Ecosystems

In the absence of ________,nutrients would not move from the abiotic to the biotic portion of the nutrient cycle within an ecosystem.

Between late 1997 and mid-2008,satellites observed that warmer-than-average ocean temperatures led to below-average chlorophyll concentrations in the oceans.This finding suggests that continued warming of the Earth's oceans could lead to

An ecosystem that experiences a small increase in nutrients available to primary producers is likely to show

A group of living communities interacting with one another and their shared physical environment is a(n)________.

All of the living organisms present in an ecosystem comprise the ________ or biotic portion of the ecosystem.

Match each term to its correct description below. -Characterized by warm temperatures and roughly 12 hours of daylight all year,this biome receives either seasonally heavy rains or year-round rains that leach nutrients from the soil.Much of the soil nutrients are locked up in the biomass of the heavy vegetation.This biome is one of the most richly biodiverse and productive ecosystems on the planet.

You are studying a grassland ecosystem with 400,000 kcal of energy stored in the primary producer level.Grasshoppers eat the grass,meadowlarks eat the grasshoppers,and a hawk eats the meadowlarks.How many kcals are now stored,and available,in the hawk?

Describe how chemical nutrients enter and are recycled through an ecosystem.

If there are 50 kcal of energy in the tertiary consumer trophic level,how many kcal would you expect to find in the primary consumer level?

Tuna are predatory fish that consume smaller,carnivorous fish that have fed on zooplankton.The zooplankton had fed on phytoplankton.When you eat tuna,you are consuming what level of the food chain?

Energy does not cycle through an ecosystem.This is because energy enters an ecosystem through photosynthesis as it changes to chemical energy.This is then used to fuel metablic activities

Which of the following are examples of primary producers in a beech-maple woodland?

Match each term to its correct description below. -Found at the poles and on mountaintops,the vegetation of this biome is dominated by low-growing flowering plants,and the rock landscape is covered in mosses and lichens.Rodents provide food for carnivores like foxes and wolves.The few large mammals include bears and musk oxen.

If there are 20,000 kcal available in the primary producer level of an ecosystem,how many kcal would be available in the secondary consumer level?

Producers capture energy from the ________ and transform it into fuel energy that passes up the food chain as one organism eats another.

Explain why ecosystems do not always have sharply defined physical boundaries.

What would happen to nutrient cycling in a forest ecosystem if all of the bacteria,protozoans,fungi,and worms were eliminated?

Match each term to its correct description below. -Dominated by coniferous trees that grow in northern or high-altitude regions with cold,dry winters and mild summers,this biome also has nutrient-poor soils and therefore a relatively low plant diversity.Large herbivores such as elk and moose live alongside smaller carnivores like weasels,wolverines,and martens.Larger carnivores include lynx and wolves.

A community of organisms together with the physical environment in which they live is known as a(n)

Your spacecraft crash-lands on an airless,lifeless moon.All that survives,along with the crew and you,are some chickens,cornflakes,and vitamins.The air and water recyclers are functioning.To maximize the food supply until a rescue craft arrives,you and the crew should