Download Biomes of the World

Biomes of the World
What is a biome?
A BIOME is the largest
geographic biotic unit, a
major community of
plants and animals with
similar life forms and
environmental
conditions.
How are biomes formed?
Biomes are distributed across the Earth based primarily on climate.
Therefore, in areas that are far apart, you will sometimes find similar
plants and animals because the climate is similar.
One factor affecting climate is latitude. Typically, the farther you move
north or south of the equator, the colder the temperature gets. Another
factor affecting climate is elevation. The higher you go in elevation, the
colder the temperature gets.
Biomes usually found at cold latitudes far from the equator are sometimes
also found on high mountains at low latitudes. Typically, a climb of 100 feet
in elevation is equivalent to traveling 600 miles northward.
How many biomes are there?
How many biomes are there?
Although there is some disagreement among scientists on
how to divide up the Earth’s biomes, most can agree on
the following eight:
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Tropical Rainforest
Desert
Freshwater
Saltwater
Grassland
Temperate Deciduous Forest
Temperate Coniferous Forest
Tundra
Tropical Rainforest
• Typically found near the equator
• Receives more than 200 cm of
rain annually
• Temperatures typically fall
between 20oC and 25oC for the
entire year
• As many as 50% of all the world’s
animal species may be found
here
The largest tropical rainforest is in South America. It is called the Amazon
rain forest. They are also found in central Africa, Central America, Southeast
Asia, Hawaii, and a small area of Australia.
Freshwater
• Freshwater is contained in lakes,
ponds, rivers and streams
• It usually originates from snow
melting off mountains and melting
ice
• When fresh and salt water meet it
is called an estuaries.
* Many of the plants that live in freshwater have strong roots to keep
them in one place.
* Some plants grow around the edge of the lake or float on the top of
the water
cattail
water lily
carp
bass
mallards
trout
bull frog
Desert
• Typically found between 25o
and 40o latitude
• Receives less than 25 cm of
rain each year
• Temperatures typically range
between 20oC and 25oC but
some extreme deserts can
reach temperatures higher than
38oC and lower than –15oC
In Africa, western North America, western Asia, central Australia,
and western South America.
* can live there because the roots are close to the top of
the ground and can get the water quickly.
Cactus
Barrel Cactus
Aloe
Prickly Pear Cactus
Black-collared
lizard
snakes
camel
desert iguana
roadrunner
jackrabbit
Saltwater
• Cover 70% of earth’s surface
• Ocean floor is made up of
shelves, plains and mountains
• All oceans are connected and
water moves between them
through currents
• Waves and tides have a great
impact on the earth
• Oceans can have depths of up
to 7 miles
• Many of the plants live near the top of the water
• they need the sunlight to help them grow and make food
• Most marine organisms live near the top of the water or close to land
• Many animals dig down into the sand or hang on to rocks, so they do not get lost
in the sea
• Other larger animals live where the water is deep
barracuda
flashlight fish
star fish
green sea turtle
clown fish
killer whale
crab
shrimp
Grassland
• Because of the dry climate,
trees are found only near water
sources such as streams
• Usually receives between 50
and 90 cm of rainfall each year
• Summer temperatures can
reach up to 38oC, and winter
temperatures can fall to –40oC
The largest grassland is in Africa. There are also grasslands in
North America, South America, central Asia, and northern
Australia.
• Grass
• Can live without a lot of rain
• Acacia tree
• Baobab tree
African elephant
Black Rhinoceros
Cheetah
Wild Dog
Giraffe
Zebra
Ostrich
Hippopotamus
Hyena
Lions
Warthog
Temperate Deciduous Forest
• Moderate climate
• Most trees will lose their leaves in
the winter
• Temperatures range between –
30oC and 30oC
• Averages from 75 to 150 cm of
precipitation
• Well developed understory
Deciduous forests are between northeastern United States and Canada.
Some are in the eastern United States. Others grow in Europe and
eastern Asia.
* Trees
* Flowers
* Oak
* Hickory
* Lily of the valley
* Maple
* Beech
* Star Flower
Eagle
Raccoon
Mouse
Brown Bear
Porcupine
Black Bear
Red Fox
Coyote
Chipmunk
White-tailed Deer
Temperate Coniferous Forest
• Also known as Taiga
• Typically found between 45o and 60o
North latitude
• Cold climate with summer rains
• Very few reptiles
• Limited understory
• Snow is primary form of precipitation
(40 – 100 cm annually)
Alaska
Canad
a
Europe
Asia
In Canada, Alaska, northern Asia, and northern Europe
• Conifer trees (have cones)
cone
• Have needles covered with wax
needles
• Wax protects the needles from freezing
Kinds of conifer trees
pine
spruce
fir
Moose
Hawk Owl
Beaver
Lynx
Wolf
Red Squirrel
Black bear
Wolverine
Snowshoe Rabbit
Tundra
• Means treeless or marshy plain
• Characterized by permafrost –
permanently frozen soil starting as
high as a few centimeters below
the surface – which severely limits
plant growth
• Winter temperatures average –
34oC while summer temperatures
usually average below 10oC
• Low precipitation (15–25 cm per
year) but ground is usually wet
because of low evaporation
• Plants
• Fungi and algae
• They cover the rocks and ground
• Animals
caribou
duck
lemming
musk ox
wolf
snowy
marmot
polar bear
sandy hill crane
owl