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Classifying Organisms in Food Webs
Transcript of Classifying Organisms in Food Webs
Key Point 2: Organisms are classified on how they effect energy in the ecosystem.
Produers are those that add energy to the ecosystem.
Producers take energy from the sunlight (in a few cases other sources) and turn it into a form that can be used by other living organisms.
In most cases this is done by plants in a process called photosynthesis.
Photosynthesis is the process by which plants take sunlight, water, and carbon dioxide and produce sugar.
Energy from the sunlight is turned into glucose, a sugar that stores energy that can be used by other organisms.
CO2 + H2O + Light -> Glucose (Sugar) + O2
Consumers are those that take energy out of the ecosystem by converting it to heat.
All organisms "consume" energy, to live and function. But we usually consider consumers those that are not capable of producing their own energy.
Therefore these organism are "consumers" of energy. They lower the amount of available energy in the ecosystem.
Key Point 1: Some organisms make their own supply of energy, some must get it from others.
Auto - self
troph - "nutrition" or in this case energy.
Autotrophs are those that can "feed themselves"
They are capable of producing glucose, the usable form of energy, that their systems (bodies) need to function.
They are things like plants and algae.
These are organisms that cannot produce glucose.
Therefore they must get their energy from eating other organisms.
Anything that eats for energy is a heterotroph.
Key Point 3: Consumers are classified based on how high up the food chain they are.
Primary - First
Secondary - Second
Tertiary - Third
A Primary Consumer is the one that eats the Producer. Its the "First Consumer" in the food chain.
A Tertiary Consumer is the one that eats the seondary consumer. (there is usually only three consumers in a food chain, simply because the energy is usually gone by then. To be discussed next lecture)
A Secondary Consumer is the one that eats the Primary consumer.
Primary Consumer- Eating the leaves, the Producer
Also a Secondary Consumer - Eating the Grasshopper (Primary Consumer), that is eating the Leaves
Keep in mind, In a Food Web some organisms may be more than one classification.. For Example...
Ready for Class?
Topic: Classifying Organisms in Food Webs
Do Now: Create a simple food chain with at least four organisms. Then add a single organism to make it into a food web.
Types of Consumers
Along with how high up the food chain they eat, consumers are classified on WHAT they eat.
Carnivores - eat other animals.
Herbivores - eat plants
Omnivores - eat plants and animals.
Scavengers - eat dead animals killed by other predators.
Decomposers - break down dead organisms. (like fungi)
Detritivores - consume detris (soil rich in organic material).
Pen or pencil
Cell phone off!
Three colored markers or crayons.
One sheet of poster paper per table.