Food Chain and Food web

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Presentation Transcript

Slide 1:

FOOD CHAINS AND FOOD WEBS

Slide 2:

What do we already know about Food chains and food webs?

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What do we want to know about adaptations? We want to know… What a food chain and food web are How energy is transferred from one organism to another within an ecosystem

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IMPORTANT VOCABULARY

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POPULATION The number of organisms of the same kind (species) living in a specific place at a specific time

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Community Populations of different kinds of organisms that live in the same place at the same time

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Species A group of organisms of the same kind that can mate and produce offspring like themselves

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Niche The role or job that an organism plays in a habitat How an organism makes a living

The place where an animal or plant lives :

HABITAT The place where an animal or plant lives

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Food Chain & Food Web

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Every organism can be classified as a producer, a consumer or a decomposer depending on its role in the ecosystem LIVING THINGS IN AN ECOSYSTEM

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An organism that makes its own food through photosynthesis Producer

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Examples of producers are plants and algae . Animals that cannot make their own food depend on producers or other consumers for the energy they need to live Producer

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Decomposer A living thing that breaks down the remains of dead organisms

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Decomposer Decomposer get their energy by breaking down or decomposing the remains of dead organism . Examples: Bacteria, fungi (mushroom) and earthworms

Bacteria is a microscopic organism that breaks down dead organisms.:

Bacteria is a microscopic organism that breaks down dead organisms. Bacteria

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Decomposer Decomposer also help to recycle nutrients (carbon and nitrogen) in the ecosystem

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Decomposer Decomposers provide nutrients for plants

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Consumer A living thing that obtains energy by eating other living things

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Consumer Consumers cannot make their own food. Most animals are consumers There are three types of consumers: Herbivores, carnivores and omnivores

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Question: Is this a producer or a consumer?

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Herbivore A consumer that eats only plants

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Herbivore Herbivores get energy by eating roots, stems, leaves, flowers and fruit Examples: Tiny insects, rabbits, gorillas, deer, snails, caterpillars

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carnivore A consumer that eats only other animals

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carnivore Carnivores get energy by eating the bodies of other organisms. Not all carnivores eat “meat”, for example, a ladybug eats the entire body of any insect it catches.

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PREDATOR PREY

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Predator An animal that hunts down other animals

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Prey An animal that is hunted by other animals

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Omnivore A consumer that eats both plants and animals

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Omnivore Bears are the largest omnivores. They feed fish but also fruits and berries Other examples: cockroaches, crows, raccoons, coyotes, and humans

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Scavenger A consumer that eats dead animals

Video: producers, consumers and decomposers:

Video: producers, consumers and decomposers

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All organisms need energy. The main source of energy on earth is sunlight Producers use the energy in sunlight to make their own food How does energy move through an ecosystem?

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The path of energy transfer in an ecosystem where each member is eaten by another member Food chain

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FOOD CHAIN Grass Snake Hawk Mushroom PRODUCER PRIMARY CONSUMER SECONDARY CONSUMER DECOMPOSER TERTIARY CONSUMER Dies Mouse

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In this food chain, the grass uses energy from sunlight to produce leaves and fruit The grass gives energy to the mouse The mouse gives energy to the snake The snake gives energy to the hawk When the hawk dies, the mushroom (decomposer) recycles the nutrients and provides them to the plants Food chain

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Food chain The arrow in a food chain means: “gives energy to.” In a food chain, each organism acts as an energy source for the next organism in the food chain

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Food web The overlapping food chains that link producers, consumers, and decomposers in an ecosystem

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Food web A food web gives a real picture of how energy moves through an ecosystem Removing one organism from a food web affects other organisms

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Food web If a species disappears , the population that depends on it will have a hard time finding food and their population will decreases Any population that the species which disappears feeds on will increase because fewer organisms are eaten

Video: FOOD CHAINS AND WEBS:

Video: FOOD CHAINS AND WEBS

Slide 43:

THE ENERGY PYRAMID

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Energy Pyramid An energy pyramid show how much energy is available to each organism at each level of food web

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Energy Pyramid Some energy is used up by the organisms at each level on the pyramid. As a result, less and less energy is available as you go higher up the energy pyramid Energy pyramids usually have only three or four levels because there is not enough energy to support more.

Slide 46:

Energy Pyramid Herbivores Carnivores Carnivores and Omnivores

If all the mice were removed from this simple food chain, the rattlesnakes would most likely — A begin to starve B start eating plants C become producers D increase in number:

QUICK QUESTION If all the mice were removed from this simple food chain, the rattlesnakes would most likely — A begin to starve B start eating plants C become producers D increase in number

If all the mice were removed from this simple food chain, the rattlesnakes would most likely :

If all the mice were removed from this simple food chain, the rattlesnakes would most likely QUICK QUESTION A Begin to starve