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Food Chains - PowerPoint PPT Presentation


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Food Chains. Shows the feeding relationships between organisms in a habitat. Composition of food chains. Begins with a PRODUCER -usually a plant The source of the energy for the food chain is the SUN The PRIMARY CONSUMER (herbivore) eats the producer

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food chains

Food Chains

Shows the feeding relationships between organisms in a habitat

composition of food chains
Composition of food chains
  • Begins with a PRODUCER -usually a plant
  • The source of the energy for the food chain is the SUN
  • The PRIMARY CONSUMER (herbivore) eats the producer
  • The SECONDARY consumer (carnivore) eats the primary etc
  • The chain finishes with a top carnivore.
pond food chain

Pond Food Chain

algae

Water flea

Damsel fly nymph

Dragon-fly nymph

beech wood habitat
Beech Wood Habitat

Sparrow Hawk

Beech leaves

aphids

Blue Tit

predator prey relationships
Predator Prey Relationships

Rabbit population rising-few predator foxes to eat them

Falling rabbit

population-

less vegetation

to eat,

More predator

foxes

to eat them

Fox population

falling-fewer rabbit

Prey to eat

Fox population rising

Lots of rabbit prey to eat

sunny meadows simulation
Sunny meadows simulation
  • http://puzzling.caret.cam.ac.uk/game.php?game=foodchain%20
transfer of energy
Transfer of Energy
  • Energy is transferred in food
  • Not all the energy taken in by an organism is available to the next organism in the chain
energy loss
Energy loss:
  • Loss in faeces
  • Not all of an organism is eaten (roots, bones)
  • Organism uses its energy, released by respiration, for movement etc
how much energy is transferred
How much energy is transferred?
  • Only 10 % of what an organism gets is passed on
  • This means that there are fewer organisms in each link of the chain
  • Chains are never longer than 5 links
food webs
Food Webs.
  • Food chains imply that an organism only eats one type of organism
  • Webs show the variety of foods eaten and are more realistic of the feeding relationships in a habitat.
pyramids
Pyramids
  • Pyramid of Numbers- show the numbers of organism found in each level of the food chain
  • Pyramid of Biomass- shows the DRY MASS of the organisms at each level
concentration of chemicals in the food chain
Concentration of chemicals in the food chain.
  • Chemicals are concentrated up a food chain and can reach lethal levels in the top carnivore
  • It happens because each consumer eats many of the organisms which each have the chemical in them