IB Biology Topic C4.1.6: Negative Feedback Control of Population Size by Density-dependent Factors Notes

Density-Dependent Factors Push a Population Back Toward Its Carrying Capacity

As a population grows denser, factors such as competition, predation, and disease act more strongly and raise the death rate or lower the birth rate.

These density-dependent factors form a negative feedback loop that holds the population near its carrying capacity.

Carrying capacity is the maximum population a habitat can sustain, set by its limiting resources (covered in C4.1.5).

Negative Feedback Counteracts Change to Restore Stability

Negative feedback is a response that opposes a change and returns a system toward a stable level.

When a population rises above its carrying capacity, density-dependent factors push it back down.

When it falls below, those pressures ease and the population recovers.

Note

Negative feedback is a stabilising force.
It stops a population from spiralling out of control or dying out.

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IB Biology Topic C4.1.6: Negative Feedback Control of Population Size by Density-dependent Factors Notes

Density-Dependent Factors Push a Population Back Toward Its Carrying Capacity

Negative Feedback Counteracts Change to Restore Stability

Three Density-Dependent Factors Strengthen as a Population Grows

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Density-Dependent Factors Push a Population Back Toward Its Carrying Capacity

Negative Feedback Counteracts Change to Restore Stability

Three Density-Dependent Factors Strengthen as a Population Grows

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C4.1.6: Negative Feedback Control of Population Size by Density-dependent Factors Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Density-Dependent Factors Push a Population Back Toward Its Carrying Capacity

Negative Feedback Counteracts Change to Restore Stability

Three Density-Dependent Factors Strengthen as a Population Grows

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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Density-Dependent Factors Push a Population Back Toward Its Carrying Capacity

Negative Feedback Counteracts Change to Restore Stability

Three Density-Dependent Factors Strengthen as a Population Grows

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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