IB Biology Topic B4.2.13 Competitive Exclusion and the Uniqueness of Ecological Niches Revision Notes (SL/HL)

IB Biology Topic B4.2.13 Competitive Exclusion and the Uniqueness of Ecological Niches Revision Notes (SL/HL) | RevisionDojo

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Competitive Exclusion: Why Every Coexisting Species Has a Unique Niche

Species compete for limited resources such as food, water, space, and light.
If two species have identical niches and rely on the same limiting resource in the same way, they cannot coexist indefinitely.
The better competitor drives the other to local extinction, which is the competitive exclusion principle first stated by Gause.

Definition

Competitive exclusion principle

Two species cannot coexist indefinitely in the same ecological niche if resources are limiting.

Tribolium Beetles: Exclusion in the Lab

Classic experiments used two flour beetles, Tribolium castaneum and Tribolium confusum.
Raised separately, both species survived across a range of temperature and humidity.

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

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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.

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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.

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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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Competitive Exclusion: Why Every Coexisting Species Has a Unique Niche

Species compete for limited resources such as food, water, space, and light.
If two species have identical niches and rely on the same limiting resource in the same way, they cannot coexist indefinitely.
The better competitor drives the other to local extinction, which is the competitive exclusion principle first stated by Gause.

Definition

Competitive exclusion principle

Two species cannot coexist indefinitely in the same ecological niche if resources are limiting.

Tribolium Beetles: Exclusion in the Lab

Classic experiments used two flour beetles, Tribolium castaneum and Tribolium confusum.
Raised separately, both species survived across a range of temperature and humidity.

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 B4.2.13: Competitive Exclusion and the Uniqueness of Ecological Niches Notes

Competitive Exclusion: Why Every Coexisting Species Has a Unique Niche

Tribolium Beetles: Exclusion in the Lab

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

Competitive Exclusion: Why Every Coexisting Species Has a Unique Niche

Tribolium Beetles: Exclusion in the Lab

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 - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics