IB Biology Topic D4.2.15 Climax Communities and Arrested Succession Revision Notes (HL)

IB Biology Topic D4.2.15 Climax Communities and Arrested Succession Revision Notes (HL) | RevisionDojo

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A Climax Community Is the Stable Final Stage of Succession

A climax community is the mature, final stage of ecological succession, such as a thriving forest.
Its species composition and abiotic conditions stay roughly constant unless the ecosystem is disturbed.
Human activities like grazing or draining wetlands can halt this process before the climax is reached.

Definition

Climax community

A climax community is a stable, mature ecosystem that has reached equilibrium with its environment.

Climax Communities Share Four Key Characteristics

Stability
1. Species composition stays constant unless the ecosystem is disturbed.
High biodiversity
1. A wide variety of plants, animals, and microorganisms coexist.
Efficient nutrient cycling
1. Decomposers recycle nutrients back into the ecosystem effectively.
Energy balance
1. Energy input from sunlight roughly matches energy output as heat loss.

Note

The type of climax community depends on climate: forests dominate in wet, temperate regions while grasslands prevail in drier ones.
Because they are so diverse and stable, climax communities deliver valuable ecosystem services and resist disturbances such as droughts or wildfires.

Arrested Succession Halts an Ecosystem Before the Climax

In arrested succession, human activity stops succession, leaving a stable but less biodiverse system.
Two main causes are grazing and wetland drainage.

Grazing Locks an Ecosystem Into Grassland Instead of Forest

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A Climax Community Is the Stable Final Stage of Succession

A climax community is the mature, final stage of ecological succession, such as a thriving forest.
Its species composition and abiotic conditions stay roughly constant unless the ecosystem is disturbed.
Human activities like grazing or draining wetlands can halt this process before the climax is reached.

Definition

Climax community

A climax community is a stable, mature ecosystem that has reached equilibrium with its environment.

Climax Communities Share Four Key Characteristics

Stability
1. Species composition stays constant unless the ecosystem is disturbed.
High biodiversity
1. A wide variety of plants, animals, and microorganisms coexist.
Efficient nutrient cycling
1. Decomposers recycle nutrients back into the ecosystem effectively.
Energy balance
1. Energy input from sunlight roughly matches energy output as heat loss.

Note

The type of climax community depends on climate: forests dominate in wet, temperate regions while grasslands prevail in drier ones.
Because they are so diverse and stable, climax communities deliver valuable ecosystem services and resist disturbances such as droughts or wildfires.

Arrested Succession Halts an Ecosystem Before the Climax

In arrested succession, human activity stops succession, leaving a stable but less biodiverse system.
Two main causes are grazing and wetland drainage.

Grazing Locks an Ecosystem Into Grassland Instead of Forest

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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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 D4.2.15: Climax Communities and Arrested Succession Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

A Climax Community Is the Stable Final Stage of Succession

Climax Communities Share Four Key Characteristics

Arrested Succession Halts an Ecosystem Before the Climax

Grazing Locks an Ecosystem Into Grassland Instead of Forest

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 Climax Community Is the Stable Final Stage of Succession

Climax Communities Share Four Key Characteristics

Arrested Succession Halts an Ecosystem Before the Climax

Grazing Locks an Ecosystem Into Grassland Instead of Forest

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