IB Biology Topic B4.1.4 Range of Tolerance of a Limiting Factor Revision Notes (SL/HL)

IB Biology Topic B4.1.4 Range of Tolerance of a Limiting Factor Revision Notes (SL/HL) | RevisionDojo

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A Limiting Factor Sets the Edge of Where a Species Can Live

Definition

Range of tolerance

Each species survives within specific minimum and maximum values of certain abiotic factors, its range of tolerance. Outside this range, survival is impossible.

Every organism depends on abiotic variables such as temperature, water, or light to carry out its life processes.
A limiting factor is the variable that is closest to its tolerance limit and so restricts a process or the distribution of a species.
When conditions push that one variable too far, the species cannot survive there no matter how favourable the other variables are.

Analogy

Think of a chain that snaps at its weakest link, not its strongest.
The limiting factor is that weakest link for a species in a given place.

Performance Follows a Bell-Shaped Zone of Tolerance

Definition

Limiting factor

A limiting factor is any abiotic or biotic variable that restricts a species’ growth, reproduction, or distribution if it goes beyond the species’ tolerance range.

The zone of tolerance is the range of an abiotic variable over which a species can survive.
In the middle sits the zone of optimum, where the species thrives and abundance peaks.

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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.

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

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 nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

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 nisi ut aliquip ex ea commodo consequat.

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.

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A Limiting Factor Sets the Edge of Where a Species Can Live

Definition

Range of tolerance

Each species survives within specific minimum and maximum values of certain abiotic factors, its range of tolerance. Outside this range, survival is impossible.

Every organism depends on abiotic variables such as temperature, water, or light to carry out its life processes.
A limiting factor is the variable that is closest to its tolerance limit and so restricts a process or the distribution of a species.
When conditions push that one variable too far, the species cannot survive there no matter how favourable the other variables are.

Analogy

Think of a chain that snaps at its weakest link, not its strongest.
The limiting factor is that weakest link for a species in a given place.

Performance Follows a Bell-Shaped Zone of Tolerance

Definition

Limiting factor

A limiting factor is any abiotic or biotic variable that restricts a species’ growth, reproduction, or distribution if it goes beyond the species’ tolerance range.

The zone of tolerance is the range of an abiotic variable over which a species can survive.
In the middle sits the zone of optimum, where the species thrives and abundance peaks.

Definition

Paywall

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

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

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.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B4.1.4: Range of Tolerance of a Limiting Factor Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

A Limiting Factor Sets the Edge of Where a Species Can Live

Performance Follows a Bell-Shaped Zone of Tolerance

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

A Limiting Factor Sets the Edge of Where a Species Can Live

Performance Follows a Bell-Shaped Zone of Tolerance

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