IB Biology Topic C4.1.13 Resource Competition Between Endemic and Invasive Species Revision Notes (SL/HL)

IB Biology Topic C4.1.13 Resource Competition Between Endemic and Invasive Species Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Invasive Species Can Outcompete Endemic Species for Limited Resources

An invasive species is a non-native species that spreads and harms the ecosystem it enters.
When it needs the same limited resources as an endemic species, the two compete directly for food, space, water, or breeding sites.
If the invader wins that competition, native populations decline and can be displaced from their habitat.

Example

The cane toad in Australia is a classic invasive species, and we return to it in detail below.

Endemic and Invasive Species Differ in Origin and Behaviour

Endemic species
1. Occur naturally in a specific region and nowhere else.
2. Are highly adapted to local conditions and often fill a narrow niche.
Invasive species
1. Are non-native and are usually introduced by human activity.
2. Spread rapidly and disrupt native ecosystems.
3. Often lack natural predators or parasites in the new environment.

Common Mistake

Do not treat "non-native" and "invasive" as the same thing.
A species is only invasive if it causes harm to the local ecosystem.

A Competitive Advantage Lets Invaders Displace Natives

Definition

Competitive exclusion principle

The competitive exclusion principle states that two species cannot occupy the same ecological niche indefinitely.

An invasive species with a competitive advantage can displace endemic species in three main ways.
1. Outcompeting for resources: taking a larger share of food, water, or breeding sites.
2. Exploiting more resources: using a wider range of food or habitat than the native species can.
3. Reproducing faster: building up a large population more quickly than its endemic competitor.

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Definition

Paywall

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Note

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Tip

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IB Biology Topic C4.1.13: Resource Competition Between Endemic and Invasive Species Notes

Invasive Species Can Outcompete Endemic Species for Limited Resources

Endemic and Invasive Species Differ in Origin and Behaviour

A Competitive Advantage Lets Invaders Displace Natives

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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Invasive Species Can Outcompete Endemic Species for Limited Resources

Endemic and Invasive Species Differ in Origin and Behaviour

A Competitive Advantage Lets Invaders Displace Natives

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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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C4.1.13: Resource Competition Between Endemic and Invasive Species Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Invasive Species Can Outcompete Endemic Species for Limited Resources

Endemic and Invasive Species Differ in Origin and Behaviour

A Competitive Advantage Lets Invaders Displace Natives

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

Invasive Species Can Outcompete Endemic Species for Limited Resources

Endemic and Invasive Species Differ in Origin and Behaviour

A Competitive Advantage Lets Invaders Displace Natives

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