World Biomes Follow along with your note packet to add notes as you watch the power point presentation

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World Biomes

  • Follow along with your note packet to add notes as you watch the power point presentation.


Tropical Rainforest

  • Tropical Rainforest

  • Abiotic factors

  • high biodiversity and biomass

  • both hot and moist;

  • ideal for bacteria and other microorganisms; they quickly decompose matter on the forest floor allowing nutrients to be recycled.

  • <1 cm of topsoil

  • About 100 in/yr of rainfall


  • Sunlight is a major limiting factor

  • Plants grow in layers (canopy receives most light)

  • Shallow, wide roots since soil is so thin and poor in nutrients

  • Little sun reaches the floor

Many symbiotic relationships

  • Many symbiotic relationships

  • Live in different levels of canopy

Threats to the Tropical Rainforest

Temperate Deciduous Forests

  • Temperate Deciduous Forests

  • Location:

  • found in temperate zone

  • (about 480 North latitude)

  • Much of the human population lives in this biome

Characterized by an abundance of deciduous (leaf bearing) trees

  • Characterized by an abundance of deciduous (leaf bearing) trees

  • Characterized by 4 seasons

More diversity in the deciduous forest vs. the coniferous forest due to increased sunlight. Trees adapt to varied climate by becoming dormant in winter

Adapt to many seasons

Threats to Temperate Deciduous Forests

Taiga aka Northern Coniferous Forest or Boreal Forest


  • Taiga

  • Abiotic factors

  • Winters are long and cold

  • Averages 100 in/yr precipitation—mostly snow

  • Soil poor in nutrients and very acidic

  • Growing season is very short

Balsam Fir

  • Coniferous (needle-bearing) trees are abundant

  • Roots long to anchor trees

  • Needles long, thin and waxy

  • Low sunlight and poor soil keeps plants from growing on forest floor



  • Adapt for cold winters

  • Burrow, hibernate, warm coat, insulation, etc.


Threats to the Taiga


Savannas (Tropical Grasslands)

  • Savannas (Tropical Grasslands)

  • Contain the greatest number of grazing animals on Earth.

  • Location: Found in the tropics…near equator

  • Amount of precipitation supports tall grasses but only occasional trees.

  • The word savanna stems from an Amerind term for plains


  • Tropical Savanna Abiotic Factors

  • Rainy and dry season

  • 25-150 in/yr precipitation

  • Fire plays a large role in this ecosystem


Whistling Thorn

  • Umbrella Thorn Acacia

Adapt for short rainy season—migrate as necessary

  • Adapt for short rainy season—migrate as necessary

  • Limited food leads to vertical feeding

Steppe Dry, cold, grasslands

The most abundant are plants called Bunch grasses, fine bladed grasses that grow in clumps to preserve water.

  • Tumbleweed

Many migrate, hibernate or burrow during extremes in temperature and precipitation


Prairie and Steppe:

  • Prairie and Steppe:

  • Grassland areas

  • 50-75 cm/yr

  • Characteristic high winds

Sod-forming grasses that won’t dry out or blow away in wind.

  • Fleabane


Many adaptations to survive extremes

Desert Abiotic factors

  • Desert Abiotic factors

  • <10 in/yr of rain

  • Little to no topsoil due to high winds.

  • Minerals not deep in soil

  • Too dry for decay

  • Usually very hot days and very cold nights


Joshua Tree

  • Desert Plant Adaptations:

  • Spines

  • Succulents

  • Thick, waxy cuticle

  • Shallow, broad roots

  • Desert Animal Adaptations:

  • Get water from food

  • Thick outer coat

  • Burrow during day

  • Large ears

  • Often are nocturnal

  • Smaller animals =

  • less surface area



Tundra Abiotic Factors

  • Tundra Abiotic Factors

  • <25 in/year

  • Temperature rarely higher than 100C

  • Permafrost layer

  • Short growing season


  • Woody shrubs

Many visitors, migration

  • Many visitors, migration

  • Few predators

  • Little Competition

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