IB Biology Topic A4.2.3 Causes of Anthropogenic Species Extinction Revision Notes (SL/HL)

IB Biology Topic A4.2.3 Causes of Anthropogenic Species Extinction Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

How Humans Drive Species Toward Extinction

The current rate of species extinction is estimated to be 100 to 1,000 times the natural background rate.
This is fueled by interconnected anthropogenic factors like overexploitation, habitat destruction, and climate change.

Primary Drivers: Overexploitation, Habitat Destruction, and Climate Change Interact

Overexploitation: Unsustainable hunting, fishing, and harvesting of species.
Habitat destruction: The conversion of natural habitats into agricultural land, urban areas, and industrial zones.
Invasive species: Non-native species introduced by humans that outcompete or prey on native species.
Pollution: The contamination of ecosystems with harmful chemicals, plastics, and waste.
Climate change: Rapid shifts in environmental conditions caused by human-induced global warming.

Giant Moa: Overhunting Drove Extinction in Less Than 200 Years

The North Island giant moa was a flightless bird endemic to New Zealand, standing up to 3.6 meters tall and weighing 230 kilograms.
It played a vital ecological role in seed dispersal and vegetation control.
What Happened?
Human Settlement:
1. Polynesians arrived in New Zealand around the 13th century.

Nice try, unfortunately this paywall isn't as easy to bypass as you think. Want to help devleop the site? Join the team at https://revisiondojo.com/join-us. exercitation voluptate cillum ullamco excepteur sint officia do tempor Lorem irure minim Lorem elit id voluptate reprehenderit voluptate laboris in nostrud qui non Lorem nostrud laborum culpa sit occaecat reprehenderit

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.

Unlock the rest of this chapter with a free account

How Humans Drive Species Toward Extinction

The current rate of species extinction is estimated to be 100 to 1,000 times the natural background rate.
This is fueled by interconnected anthropogenic factors like overexploitation, habitat destruction, and climate change.

Primary Drivers: Overexploitation, Habitat Destruction, and Climate Change Interact

Overexploitation: Unsustainable hunting, fishing, and harvesting of species.
Habitat destruction: The conversion of natural habitats into agricultural land, urban areas, and industrial zones.
Invasive species: Non-native species introduced by humans that outcompete or prey on native species.
Pollution: The contamination of ecosystems with harmful chemicals, plastics, and waste.
Climate change: Rapid shifts in environmental conditions caused by human-induced global warming.

Giant Moa: Overhunting Drove Extinction in Less Than 200 Years

The North Island giant moa was a flightless bird endemic to New Zealand, standing up to 3.6 meters tall and weighing 230 kilograms.
It played a vital ecological role in seed dispersal and vegetation control.
What Happened?
Human Settlement:
1. Polynesians arrived in New Zealand around the 13th century.

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 A4.2.3: Causes of Anthropogenic Species Extinction Notes

How Humans Drive Species Toward Extinction

Primary Drivers: Overexploitation, Habitat Destruction, and Climate Change Interact

Giant Moa: Overhunting Drove Extinction in Less Than 200 Years

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

How Humans Drive Species Toward Extinction

Primary Drivers: Overexploitation, Habitat Destruction, and Climate Change Interact

Giant Moa: Overhunting Drove Extinction in Less Than 200 Years

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