1 / 17

Food Chains

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

Samuel
Download Presentation

Food Chains

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Food Chains Shows the feeding relationships between organisms in a habitat

  2. 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.

  3. Pond Food Chain algae Water flea Damsel fly nymph Dragon-fly nymph

  4. Beech Wood Habitat Sparrow Hawk Beech leaves aphids Blue Tit

  5. 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

  6. Sunny meadows simulation • http://puzzling.caret.cam.ac.uk/game.php?game=foodchain%20

  7. 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

  8. Energy loss: • Loss in faeces • Not all of an organism is eaten (roots, bones) • Organism uses its energy, released by respiration, for movement etc

  9. 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

  10. 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.

  11. Woodland food web

  12. 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

  13. Pyramid of Numbers

  14. 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

More Related