IB Environmental systems and societies Topic 3.1E Biodiversity Hotspots Revision Notes (HL)

IB Environmental systems and societies Topic 3.1E Biodiversity Hotspots Revision Notes (HL) | RevisionDojo

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Biodiversity Hotspots: Where Life Concentrates

Definition

Biodiversity hotspot

A biogeographic region that has exceptionally high levels of species richness and endemism but is also under significant threat from human activity.

Biodiversity is spread unevenly; hotspots are regions with exceptional numbers of rare, endemic, and threatened species.
They have very high species richness and are top priorities for conservation.
Most lie in tropical biomes, where conditions favour diversity.

Note

The tropics hold the greatest biodiversity.
Polar regions and deserts have low productivity and far fewer species.

What Makes Biodiversity Unevenly Distributed

Climate stability: consistent temperature and rainfall support survival and speciation.
Primary productivity: high photosynthesis sustains complex food webs.
Habitat complexity: varied microhabitats let many species occupy different niches.
Evolutionary time: long-undisturbed regions have had more time to diversify.
Isolation: geographic isolation promotes endemism and unique evolution.

Example

The Amazon Rainforest alone contains roughly 10% of all known species.

The World's Major Biodiversity Hotspots

Conservation International recognises 36 biodiversity hotspots.

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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.

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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.

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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Biodiversity Hotspots: Where Life Concentrates

Definition

Biodiversity hotspot

A biogeographic region that has exceptionally high levels of species richness and endemism but is also under significant threat from human activity.

Biodiversity is spread unevenly; hotspots are regions with exceptional numbers of rare, endemic, and threatened species.
They have very high species richness and are top priorities for conservation.
Most lie in tropical biomes, where conditions favour diversity.

Note

The tropics hold the greatest biodiversity.
Polar regions and deserts have low productivity and far fewer species.

What Makes Biodiversity Unevenly Distributed

Climate stability: consistent temperature and rainfall support survival and speciation.
Primary productivity: high photosynthesis sustains complex food webs.
Habitat complexity: varied microhabitats let many species occupy different niches.
Evolutionary time: long-undisturbed regions have had more time to diversify.
Isolation: geographic isolation promotes endemism and unique evolution.

Example

The Amazon Rainforest alone contains roughly 10% of all known species.

The World's Major Biodiversity Hotspots

Conservation International recognises 36 biodiversity hotspots.

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.

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

IB Environmental systems and societies 3.1E Biodiversity Hotspots Notes

Topic 1: Foundation 3 subtopics

Topic 2: Ecology5 subtopics

Topic 3: Conservation and biodiversity3 subtopics

Topic 4: Water4 subtopics

Topic 5: Land2 subtopics

Topic 6: Atmosphere and climate change4 subtopics

Topic 7: Natural resources3 subtopics

Topic 8: Human populations and urban systems3 subtopics

HL lenses 3 subtopics

Biodiversity Hotspots: Where Life Concentrates

What Makes Biodiversity Unevenly Distributed

The World's Major Biodiversity Hotspots

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

Biodiversity Hotspots: Where Life Concentrates

What Makes Biodiversity Unevenly Distributed

The World's Major Biodiversity Hotspots

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