IB Biology Topic B4.1.6 Abiotic Factors as the Determinants of Terrestrial Biome Distribution Revision Notes (SL/HL)

IB Biology Topic B4.1.6 Abiotic Factors as the Determinants of Terrestrial Biome Distribution Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Temperature and Rainfall: The Two Dials That Set Every Terrestrial Biome

Definition

Biome

Large-scale groupings of ecosystems sharing similar abiotic factors (e.g., temperature, precipitation).

Deserts in Arizona and the Sahara sit thousands of kilometres apart, yet both are hot and dry.
Regions with similar temperature and rainfall tend to develop the same type of biome, wherever they occur on Earth.
These two abiotic factors are the primary determinants of which terrestrial biome forms in a region.
Other factors such as seasonality and soil play only a secondary role.

Analogy

Picture temperature and rainfall as two dials on a mixing desk.
Turn both dials up high and you get tropical rainforest.
Turn the rainfall dial down but keep temperature high and you get desert.
Every biome is just a different setting of these two dials.

Temperature Sets the Pace: Energy Controls How Fast Life Runs

Temperature controls the rate of metabolic reactions in all organisms.
1. In warm regions like the tropics, enzymes work faster, so plants photosynthesise rapidly and grow year-round.
2. This drives high net primary productivity, so warm biomes can support far more life.

Nice try, unfortunately this paywall isn't as easy to bypass as you think. Want to help devleop the site? Join the team at https://revisiondojo.com/join-us. exercitation voluptate cillum ullamco excepteur sint officia do tempor Lorem irure minim Lorem elit id voluptate reprehenderit voluptate laboris in nostrud qui non Lorem nostrud laborum culpa sit occaecat reprehenderit

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.

Unlock the rest of this chapter with a free account

Temperature and Rainfall: The Two Dials That Set Every Terrestrial Biome

Definition

Biome

Large-scale groupings of ecosystems sharing similar abiotic factors (e.g., temperature, precipitation).

Deserts in Arizona and the Sahara sit thousands of kilometres apart, yet both are hot and dry.
Regions with similar temperature and rainfall tend to develop the same type of biome, wherever they occur on Earth.
These two abiotic factors are the primary determinants of which terrestrial biome forms in a region.
Other factors such as seasonality and soil play only a secondary role.

Analogy

Picture temperature and rainfall as two dials on a mixing desk.
Turn both dials up high and you get tropical rainforest.
Turn the rainfall dial down but keep temperature high and you get desert.
Every biome is just a different setting of these two dials.

Temperature Sets the Pace: Energy Controls How Fast Life Runs

Temperature controls the rate of metabolic reactions in all organisms.
1. In warm regions like the tropics, enzymes work faster, so plants photosynthesise rapidly and grow year-round.
2. This drives high net primary productivity, so warm biomes can support far more life.

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.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic B4.1.6: Abiotic Factors as the Determinants of Terrestrial Biome Distribution Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Temperature and Rainfall: The Two Dials That Set Every Terrestrial Biome

Temperature Sets the Pace: Energy Controls How Fast Life Runs

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

Temperature and Rainfall: The Two Dials That Set Every Terrestrial Biome

Temperature Sets the Pace: Energy Controls How Fast Life Runs

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