IB Biology Topic B4.1.7 Biomes as Groups of Ecosystems with Similar Communities Revision Notes (SL/HL)

IB Biology Topic B4.1.7 Biomes as Groups of Ecosystems with Similar Communities Revision Notes (SL/HL) | RevisionDojo

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Biomes: Similar Climates Build Similar Communities Worldwide

A biome is a group of ecosystems that share a similar community because they share a similar climate.
Regions with the same climate develop communities with the same overall structure and appearance, even on different continents.
1. Tropical rainforests in South America, Africa, and Southeast Asia look strikingly alike, even though their species are mostly unrelated.
This resemblance is the result of convergence, where similar selection pressures shape similar communities in lineages that share no recent common ancestor.

Analogy

Biomes are like different classes answering the same exam question.
The question is the climate and the best answers are the community traits it rewards.
Students who never met still hand in similar answers because the question was the same.

Convergence: The Same Climate Selects the Same Community Type

When unrelated communities face the same climate, natural selection favours the same general set of traits in each one.
The result is that biomes on different continents share a common community structure, such as the dominant plant form, the layering of vegetation, and the kinds of animals present.
For example, hot deserts on separate continents are dominated by unrelated succulent plants that store water in swollen stems, a case of convergence at the community level.

Note

Which biome forms in a region is set mainly by its temperature and rainfall, the focus of B4.1.6.
Here the key idea is that similar climates, wherever they occur, produce communities that resemble each other.

The Major Terrestrial Biomes Each Have a Signature Community

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IB Biology Topic B4.1.7: Biomes as Groups of Ecosystems with Similar Communities Notes

Biomes: Similar Climates Build Similar Communities Worldwide

Convergence: The Same Climate Selects the Same Community Type

The Major Terrestrial Biomes Each Have a Signature Community

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Biomes: Similar Climates Build Similar Communities Worldwide

Convergence: The Same Climate Selects the Same Community Type

The Major Terrestrial Biomes Each Have a Signature Community

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B4.1.7: Biomes as Groups of Ecosystems with Similar Communities Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Biomes: Similar Climates Build Similar Communities Worldwide

Convergence: The Same Climate Selects the Same Community Type

The Major Terrestrial Biomes Each Have a Signature Community

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

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Biomes: Similar Climates Build Similar Communities Worldwide

Convergence: The Same Climate Selects the Same Community Type

The Major Terrestrial Biomes Each Have a Signature Community

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