IB Environmental systems and societies Topic 2.1B Population Revision Notes (SL/HL)

IB Environmental systems and societies Topic 2.1B Population Revision Notes (SL/HL) | RevisionDojo

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Population: The Unit Where Ecology Actually Happens

Definition

Population

A population is a group of individuals of the same species in an area.

A population is a group of individuals of the same species living in the same area at the same time and able to interbreed.
Populations are the fundamental unit of ecology, the building blocks of communities and ecosystems.

What Makes a Group of Organisms a Population

Same species: the individuals all belong to one biological species.
Same place and time: they share a habitat and overlap in the same period.
Interbreeding: members can reproduce with each other, keeping genes flowing through the group.

Six Characteristics Ecologists Measure

Size (N): the total number of individuals in the population.
Density: the number of individuals per unit area or volume, such as trees per hectare or fish per cubic metre.
Distribution: the spatial arrangement of individuals, which can be random, uniform, or clumped.
1. Clumped is the most common pattern in nature, driven by patchy resources or social grouping.

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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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Population: The Unit Where Ecology Actually Happens

Definition

Population

A population is a group of individuals of the same species in an area.

A population is a group of individuals of the same species living in the same area at the same time and able to interbreed.
Populations are the fundamental unit of ecology, the building blocks of communities and ecosystems.

What Makes a Group of Organisms a Population

Same species: the individuals all belong to one biological species.
Same place and time: they share a habitat and overlap in the same period.
Interbreeding: members can reproduce with each other, keeping genes flowing through the group.

Six Characteristics Ecologists Measure

Size (N): the total number of individuals in the population.
Density: the number of individuals per unit area or volume, such as trees per hectare or fish per cubic metre.
Distribution: the spatial arrangement of individuals, which can be random, uniform, or clumped.
1. Clumped is the most common pattern in nature, driven by patchy resources or social grouping.

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 2.1B Population 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

Population: The Unit Where Ecology Actually Happens

What Makes a Group of Organisms a Population

Six Characteristics Ecologists Measure

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

Population: The Unit Where Ecology Actually Happens

What Makes a Group of Organisms a Population

Six Characteristics Ecologists Measure

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