IB Environmental systems and societies 2.2F Food Web and Biomass Notes

Food Webs: Many Chains Linked Into One Realistic Picture

Definition

Food web

Food webs are networks of interconnected food chains that show how energy and matter flow through an ecosystem.

A food web is many interlinked food chains showing the feeding relationships in a community.

It is more realistic than a single chain because most organisms eat and are eaten by more than one species.

Arrows always point from the organism eaten to the organism eating it, tracing the direction of energy flow.

Analogy

A food chain is a single train track, while a food web is a railway network where energy keeps moving even if one route is disrupted.

Reading a Food Web: Follow the Arrows From Producers Upward

Producers form the base by capturing sunlight and storing it as chemical energy.

Consumers gain that energy by feeding directly or indirectly on producers.

Decomposers and detritivores feed on dead matter at every level and recycle nutrients back into the system.

Trophic levels label each feeding position, and are covered in detail in 2.2D.

Example

A single chain within a web might run grass to grasshopper to frog to snake to hawk.
Each arrow shows where the energy and biomass move next.

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Note

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Tip

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

IB Environmental systems and societies 2.2F Food Web and Biomass Notes

Food Webs: Many Chains Linked Into One Realistic Picture

Reading a Food Web: Follow the Arrows From Producers Upward

Complexity and Stability: Species Sit at Several Levels at Once

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Food Webs: Many Chains Linked Into One Realistic Picture

Reading a Food Web: Follow the Arrows From Producers Upward

Complexity and Stability: Species Sit at Several Levels at Once

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

IB Environmental systems and societies 2.2F Food Web and Biomass Notes

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

Food Webs: Many Chains Linked Into One Realistic Picture

Reading a Food Web: Follow the Arrows From Producers Upward

Complexity and Stability: Species Sit at Several Levels at Once

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Food Webs: Many Chains Linked Into One Realistic Picture

Reading a Food Web: Follow the Arrows From Producers Upward

Complexity and Stability: Species Sit at Several Levels at Once

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account