Plastics and the Food Web

Why is the Alewife referred to as  a "Keystone Species"?

• The Alewife provides a tremendous amount of food energy to the ecosystems of Long Island. 
• Many different organisms rely on the Alewife for food energy.
• The Alewife bring a large amount of energy from the Ocean's Ecosystem to Long Island's freshwater ecosystems. 
• All of these are reasons why the Alewife are considered a Keystone Species. 

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What is the original source of almost all energy in most ecosystems?

• carbohydrates
• sunlight
• water
• carbon

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An organism that produces its own food supply from inorganic compounds is called a(an)

• heterotroph
• consumer
• detritivore
• autotroph

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Autotrophs make up the _______ level in all ecosystems.

• First
• Second
• Third
• Fourth

What does a food web represent?

• All connections of energy flow throughout all organisms in a habitat.
• The specific ways that mutualism is carried out.
• A single pathway or energy flow between organisms. 
• How carnivores get their food. 

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The image provided is an example of a(n):

• Carnivore
• Herbivore
• Producer
• Autotroph

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The image provided is an example of a(n):

• Producer
• Autotroph
• Consumer
• Insect

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The nonliving aspects of an ecosystem.

• Abiotic factors
• Biotic factors

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An illustration that uses arrows to show the many possible directions in which matter and energy can pass through the organisms in an ecosystem.

• Food chain
• Food web
• Energy Pyramid
• Succession Map

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The living portions of the ecosystem.

• Biotic factors
• Abiotic factors

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