Feeding Relationships A food chain shows a simple feeding relationship. Sun → All food chains start with the sun www.assignmentpoint.com
Feeding Relationships A food chain shows a simple feeding relationship. Sun → grass → www.assignmentpoint.com
Feeding Relationships A food chain shows a simple feeding relationship. Sun → grass → rabbit → www.assignmentpoint.com
Feeding Relationships A food chain shows a simple feeding relationship. Sun → grass → rabbit → fox www.assignmentpoint.com
All food chains start with ENERGY from the sun www.assignmentpoint.com
carbon dioxide from the air energy from sunlight (or light) water from the roots food transported to the rest of the plant www.assignmentpoint.com
Photosynthesis carbon dioxide from the air energy from sunlight (or light) water from the roots food transported to the rest of the plant www.assignmentpoint.com
Because plants produce their own food, they are called ‘Producers’ www.assignmentpoint.com
The energy is then passed on to animals when they eat the plant. www.assignmentpoint.com
Animals of all shapes… www.assignmentpoint.com
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…and sizes! www.assignmentpoint.com
They are called primary consumers Because these animals are the first to take the food energy from the plants, They are called primary consumers www.assignmentpoint.com
Some of these primary consumers have predators Some of these primary consumers have predators. Other animals that feed on them www.assignmentpoint.com
Aphids are eaten by…. www.assignmentpoint.com
Ladybirds www.assignmentpoint.com
Animals that eat primary consumers are called secondary consumers www.assignmentpoint.com
But in reality it is more complicated than that So far this is a straightforward food chain Sun → aphid → ladybird But in reality it is more complicated than that www.assignmentpoint.com
This bird eats ladybirds and aphids www.assignmentpoint.com
This bird eats smaller birds, mice, and rabbits www.assignmentpoint.com
Mice and rabbits have other predators www.assignmentpoint.com
What do you think the frog eats? What will eat the frog? What do you think the frog eats? www.assignmentpoint.com
Sometimes it’s not entirely clear who eats who! www.assignmentpoint.com
We can show what goes on with the help of a Food Web www.assignmentpoint.com
What would happen if a disease killed off many of the hawks? www.assignmentpoint.com
There will be nothing to eat the snakes, so their numbers will increase. www.assignmentpoint.com
All the frogs get eaten www.assignmentpoint.com
No frogs. More crickets www.assignmentpoint.com
Most of the cattail gets eaten by the crickets www.assignmentpoint.com
Now the crickets don’t have enough food so their numbers go down www.assignmentpoint.com
..and so on. Numbers of each species have an effect on the numbers of the other species in the web. www.assignmentpoint.com
B) Humans nearby bring cats into the area. Use the food web worksheet to predict what might happen in the following situations: A) There is very little rain and much of the Marsh Grass and Cattail die off. B) Humans nearby bring cats into the area. C) The frogs eats some poisoned slugs from a garden www.assignmentpoint.com