Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the...
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Transcript of Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the...
![Page 1: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/1.jpg)
Food Chains
![Page 2: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/2.jpg)
• The arrows of a food chain point toward the right
• The chain starts at the left at the level of the producers
• Why?– The arrows point toward the consumers
at the next trophic level
![Page 3: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/3.jpg)
• Producer:– Produces (makes) energy for the
consumers– Ex: plants (make their own energy)
• Consumer:– Obtains energy by eating other
organisms– Ex: animals, birds, insects
![Page 4: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/4.jpg)
2. Indicate the producers and the consumers
Sun Algae Bacteria Fish
Sea Lion Polar Bear
![Page 5: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/5.jpg)
The Trophic Levels
• The different levels within a food chain
• There are rarely more than four trophic levels in a food chain...
• But it is not impossible to have more!
![Page 6: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/6.jpg)
3. Indicate the trophic levels
Sun Algae Bacteria Fish
Sea Lion Polar Bear
![Page 7: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/7.jpg)
4. Straight Line or Cycle?
• Food chains are continuous cycles
• The animals at the top level die and their bodies are reabsorbed into the soil in the form of nutrients
• This restarts the source of energy (along with the sun) in plants
![Page 8: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/8.jpg)
5. Biodiversity
• The degree of variation in the biotic components (living organisms) of an ecosystem
![Page 9: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/9.jpg)
6. Why is it Important?
• Biodiversity increases the productivity of an ecosystem
• Examples:–More species = more meal options– Populations will be more sustainable–More plant species = more sources of
energy for consumers
![Page 10: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/10.jpg)
7. The influence on the chain
When we take a species out of a food chain...
• It will no longer be able to provide its energy to other organisms
• The organisms at the nest level will not be able to eat them
• Biodiversity decreases
![Page 11: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/11.jpg)
Food Webs/Networks
• The position of the animal depends on what they are eating at the time
• For example:–When a mouse is eating grass, he is a
primary consumer (trophic level 2)–When he eats insects, he is a secondary
consumer (trophic level 3)
![Page 12: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/12.jpg)
8. Food Web
Level 1 Level 2 Level 3 Level 4
![Page 13: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/13.jpg)
• The organisms are placed in the food web based on the food source that is at the lowest trophic level
• Their position may change when the food/energy source changes
![Page 14: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/14.jpg)
9. Energy
• The energy consumed is mostly used for cellular reproduction
• It is also used for regular bodily functions (breathing, walking, etc)
• Energy is converted into heat to keep warm-blooded animals warm
![Page 15: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/15.jpg)
10. Dead Organisms
• Animals and plants die and decompose
• The nutrients are reabsorbed into the soil
• The restarts the energy source (along with the sun) for the plants
![Page 16: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/16.jpg)
• Heterotrophic:– Uses organic compounds as a source of
carbon and a source of energy – Need to eat!– Energy is absorbed through cellular
membranes
• Autotrophic:– Uses energy from the sun to create
organic compounds– Create their own food/energy
![Page 17: Food Chains. The arrows of a food chain point toward the right The chain starts at the left at the level of the producers Why? – The arrows point toward.](https://reader036.fdocuments.us/reader036/viewer/2022070323/56649da25503460f94a8f52b/html5/thumbnails/17.jpg)
12. Energy Pyramid