IB Environmental systems and societies Topic 3.1A Biodiversity Revision Notes (SL/HL)

IB Environmental systems and societies Topic 3.1A Biodiversity Revision Notes (SL/HL) | RevisionDojo

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Biodiversity: The Variety of Life at Three Levels

Definition

Biodiversity

Biodiversity refers to the variety of life in an ecosystem, encompassing different levels of biological organization.

Biodiversity is the total variety of living organisms, and it sustains ecosystem stability, resilience, and productivity.
It is measured at three interconnected levels:
1. Habitat diversity: the range of habitats or ecosystems in an area.
2. Species diversity: the number and relative abundance of species in a region.
3. Genetic diversity: the variety of genes within a species.

Note

Biodiversity is more than a species count; it also includes ecological roles and functional diversity.
Each level supports the others, so together they set how well an ecosystem absorbs and recovers from change.

Habitat Diversity: More Habitats Mean More Niches

Definition

Habitat diversity

Habitat diversity is the range of different habitats present in an ecosystem or within a geographical area.

Habitat diversity is the range of different habitats or niches within an ecosystem or biome.
Each habitat supports distinct communities adapted to its conditions.
So areas with high habitat diversity usually hold high overall biodiversity.

Example

Coral reefs and tropical rainforests have very high habitat diversity, with countless microhabitats.
Deserts and polar regions have uniform conditions, so their habitat diversity is low.
Urban areas lose habitat diversity as human land use replaces natural environments.

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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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Biodiversity: The Variety of Life at Three Levels

Definition

Biodiversity

Biodiversity refers to the variety of life in an ecosystem, encompassing different levels of biological organization.

Biodiversity is the total variety of living organisms, and it sustains ecosystem stability, resilience, and productivity.
It is measured at three interconnected levels:
1. Habitat diversity: the range of habitats or ecosystems in an area.
2. Species diversity: the number and relative abundance of species in a region.
3. Genetic diversity: the variety of genes within a species.

Note

Biodiversity is more than a species count; it also includes ecological roles and functional diversity.
Each level supports the others, so together they set how well an ecosystem absorbs and recovers from change.

Habitat Diversity: More Habitats Mean More Niches

Definition

Habitat diversity

Habitat diversity is the range of different habitats present in an ecosystem or within a geographical area.

Habitat diversity is the range of different habitats or niches within an ecosystem or biome.
Each habitat supports distinct communities adapted to its conditions.
So areas with high habitat diversity usually hold high overall biodiversity.

Example

Coral reefs and tropical rainforests have very high habitat diversity, with countless microhabitats.
Deserts and polar regions have uniform conditions, so their habitat diversity is low.
Urban areas lose habitat diversity as human land use replaces natural environments.

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 3.1A Biodiversity 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: The Variety of Life at Three Levels

Habitat Diversity: More Habitats Mean More Niches

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: The Variety of Life at Three Levels

Habitat Diversity: More Habitats Mean More Niches

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