food chains and food webs (by: npmendez)
TRANSCRIPT
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FOODFOOD CHAINSCHAINS
Prepared by:Prepared by:
NOE P. MENDEZNOE P. MENDEZMaster of Science in BiologyMaster of Science in Biology
CENTRAL MINDANAO CENTRAL MINDANAO UNIVERSITYUNIVERSITY
[email protected]@gmail.com
FOODFOOD WEBSWEBS&&
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Trophic Trophic LevelLevel
Each step in a food chain or food web
1. Level 1 — Producers (autotrophs)
2. Level 2 — Primary Consumers (herbivores)
3. Level 3 — Secondary Consumers (carnivores or
omnivores)
4. Level 4 — Tertiary Consumers (carnivore—usually
top carnivore).
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The energy flow from one trophic level to the other;
Shows “what eats what” or “who eats whom”;
Simple and direct; and Involves ONE organism at each trophic
level.
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Example of a Food Example of a Food ChainChain
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Example of a Food Example of a Food ChainChain
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Producers and Producers and ConsumersConsumers
Plants Plants are called are called producers producers because they make because they make their own food. They are at the start of a food their own food. They are at the start of a food chain.chain.
AnimalsAnimals are called are called consumers consumers because they eat because they eat other plants and animals.other plants and animals.
ProducerProducer ConsumerConsumer10
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Prey and predatorsPrey and predatorsA A predatorpredator is an animal that eats other animals. is an animal that eats other animals.The animals that predators eat are called The animals that predators eat are called preyprey..
PreyPreyPredatorPredator
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What organisms are top What organisms are top of the food chains?of the food chains?
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Plants
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Chemotrophs
-Autotrophs that get their energy from inorganic substances, such as salt.
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-Organisms that do not make their own food.
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Consumers1. Detritivores – feed on the tissue of dead organisms (both plants and animals).
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Consumers2. Herbivores – eat ONLY plants.
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Consumers3. Carnivores– eat ONLY meat
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Consumers4. Omnivores– eat BOTH plants and animals.
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Consumers5. Decomposers – absorb any dead material.
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An interlocking pattern of food chains; Most organisms eat more than JUST
one organism; More accurate term since every
organism is involved with several other organisms; and
More complex or forms a network.
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How your food web should look
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Example of a Food WebExample of a Food WebHawks
Weasels Raccoons
Mice
Grass
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FOOD CHAIN FOOD WEB Simple Complex Direct Network One organism
per trophic level More than one
organism per trophic level
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All pictures were obtained from various sources on Google Images.
None of the pictures/illustrations are mine. Credit is given to all artists/photographers for
their work.26