Transcript Biotic Factors

Biomes are a group of ecosystems with
similar abiotic and biotic factors.
(example: hot/dry desert in Nevada and
North Africa)
Rain Forests
found near the equator
Abiotic Factors:
Warm temps (Avg. 25° C, 77° F)
Large Amounts of Moisture
(Humidity Avg. 88%)
High levels of Rainfall
(more than 100 inches per year: 8 feet)
Very Poor Soil
(nutrients washed away/lots of plants)
Biotic Factors:
Rainforests have more biodiversity than any
other biome.
Animals that can live in trees
(tails, fly, grip)
Organisms that need a lot of
moisture (frogs/fungi)
Organisms that don’t need a
lot of light (under the canopy)
Biotic Factors:
Rainforests make 40% of the Earth’s oxygen.
Not a lot of light under
canopy/ need to absorb light/
lots of vines
300 different types of species
of trees every 2 acres, 70% of
the plants are trees
Desert Biomes
Desert Biomes
Abiotic Factors:
Drastic Temp changes from day to night
(49°C, 120°F to
-18°C, -1°F)
Windy
Very dry
(less than 9 in. of rain a year, less than one foot)
Sand/ Little or no topsoil
In the Desert Biome,
plants (cactus) have the
ability to hold water for
later use and most animals
(scorpion) are nocturnal.
Animals usually have thick
shells or skin
Get water from food, or store
water (plants)
Come out at night and burrow
during the day
Grassland
Grassland
Abiotic Factors:
Temperatures vary throughout the year,
warm summer, cold winter
Windy
Has a rainy season and a dry season
(10
to 30 in. a year, not enough rain to naturally support
trees, but plenty for grass and shrubs)
Nutrient-rich soil
Dominated by grasses
Grazing animals
Plants and Animals that can
adjust to fit season- ex. thicker
coats in winter, burrow during
extreme temps
Deciduous
Forest
Abiotic Factors:
Temperatures vary greatly- very cold
winter, hot summer
Four distinct seasons
Annual rainfall (50-300cm, 19-118 in.)
Soil- rich top layer, deep clay layer
Deciduous
Forest
The weather in this
area changes with
the seasons. It
becomes very cold
in the winter and hot
in the summer.
There is enough
rainfall to support
large trees.
Trees in this biome
drop their leaves in
the fall/winter and
new ones sprout each
spring.
Nesting birds
Diverse animals
Animals that can adjust to fit
season- thicker coats in
winter, hibernating during
extreme temps
A lot of brown and green
organisms
Taiga:
also known as northern coniferous
Abiotic Factors:
Long, Very cold winter season, below
freezing for six months out of the year.
Cold season, Rainy Season
Snow is the main precipitation
Soil- poor in minerals and acidic
Coniferous trees- aspen, birch
Large animals
Animals with thick fur and that
hibernate in severe conditions
Tundra
Tundra
Abiotic Factors:
Very cold (avg. -70°)
very windy
Dry, Little annual rainfall
Soil- underneath thin topsoil- frozen
ground, no nutrients in the soil
Treeless land
Limited organisms due to low
vegetation and extreme cold
Only shallow-rooted grass and
small plants
Migration animals, very
insulated
Lot of white animals