April 29 th , 2013
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Transcript of April 29 th , 2013
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April 29th, 2013
• Warm - Up:1) What is the difference between a chain and a web?
2) In 2 minutes, write a definition for each, and compare what you wrote with the person sitting next to you.
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April 29th, 2013• The following slides are numbered 1-24.
For today’s assignment:
Write the number and an answer to the question (don’t write the question)
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How do biotic compare to abiotic?• All living parts of
a habitat– Plants– Animals– Bacteria
• All non-living parts of a habitat- Water- Soil- Rocks- Fire
1 Factors in an ecosystem:
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Are these animals biotic or abiotic factors?
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Biotic or Abiotic?3
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Biotic or Abiotic?4
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Biotic or Abiotic?5
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Biotic or Abiotic?6
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Why are plants called producers?
• The ultimate source of life is the sun
• Plants use the sun’s energy to make food in a process called photosynthesis
• Examples- cactus, trees, algae, phytoplankton
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energy +CO2 +H2O = sugar + O2
“plant food”
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What are consumers?• Herbivores-
plant-eaters
• Carnivores- meat-eaters
• Omnivores- eat plants & meat
• Scavengers – a carnivore that feeds on body of dead organism
• Decomposers- organisms that break down wastes & dead organisms & return materials to ecosystem
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What is a food chain?
• A sequence that links a species by its feeding relationships
• Example: grass cottontail hawk
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What is a food web?• Model that shows
the network of feeding relationships, and the flow of energy in the ecosystem
• Food webs show all the connected food chains
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11 What do decomposers eat?
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April 30th, 2013• Today’s Warm-Up Draw two food chains
for two different carnivores.AGENDA• Any presentations?• The following slides are numbered 13-24. For
today’s assignment:Write the number and an answer to the question (don’t write the question)
• QUIZ using ecosystems poster
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What is an energy pyramid?• Diagram that
compares energy used by producers, primary consumers, and secondary consumers
• Each level is a called a trophic level, and it is occupied by an organism
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What happens at each feeding level?• Energy is lost as it flows UP a level• Carnivores are at the top• Herbivores are at the 2nd level• Producers are at the bottom
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14 Why are bears at the top?
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15 Why are there so many producers?
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Reef SharkThe reef shark gets energy by
eating parrotfish and triggerfish.
16 Is this a producer or a consumer?
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TriggerfishThe triggerfish gets energy by
eating shrimp.
17 Producer or Consumer?
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ShrimpThe shrimp gets energy by eating
phytoplankton.
18 Producer or Consumer?
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PhytoplanktonPhytoplankton get energy from
the sun.
19 Producer or Consumer?
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Sea SpongeSea sponge gets energy by eating
zooplankton.
20 Producer or Consumer?
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ZooplanktonZooplankton get energy by eating
phytoplankton.
21 Producer or Consumer?
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ParrotfishThe parrotfish gets energy by
eating algae
22 Producer or Consumer?
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Sea Turtle
The sea turtle gets energy by eating algae.
23 Producer or Consumer?
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Algae
Algae get their energy from the sun.
24 Producer or Consumer?
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food chain compared to food web• It moves like a
cycle• It has few
organisms– Plant to animal– Animal to
animal
• It goes in many directions
• It has many organisms- Plant to
animal 1, animal 2, …
Compare:
Both show what organisms eat, and the flow of energy
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End.
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April 30th, 2013• What features enable fish to survive
underwater? (Give two examples)• Why do snakes live so well in the desert?• Why do mosquitoes need people?
• For today’s assignment:Write the number and an answer to
the question (don’t write the question)