1. Factors that Influence the Characteristics and Distribution of Biomes

2. Factors that Influence Biome Characteristics and Distribution
Temperature
Precipitation
Latitude
Elevation
Ocean Currents

3. Temperature and Precipitation
Temperature and precipitation (which includes rainfall, snow, mist and fog) are two of the MOST IMPORTANT abiotic factors that influence the characteristics of biomes and the distribution of biomes on Earth
Other factors influence temperature and precipitation in a biome, including latitude, elevation, and ocean currents

4. Temperature

5. Precipitation

6. Climatographs
Climate = the average pattern of weather conditions that occur in a region, which are observed and recorded over a period of years
Climatograph = is a graph of climate data for a specific region and is generated from data usually obtained over 30 years from local weather observation stations
A climatograph includes average monthly temperature and an average of the total monthly precipitation for each month

7. Climatographs What is the average temperature in Vancouver in March?
August?
November?
What is the average amount of rainfall in Vancouver in
January?
July?
October?

8. Comparing Climatographs
Which region has hotter summers?
Which region has colder winters?
Which region gets more rain?

9. Comparing Climatographs of Biomes

10. Comparing Climatographs of Biomes

11. Latitude
Latitude is the distance measured in degrees north or south from the equator

12. Latitude

13. Latitude and Temperature
The equator is at 0° and divides the Earth into the northern and southern hemispheres
At the equator, the rays from the sun shine down from almost directly overhead  this means lots of sun (warm!) and little temperature fluctuation
The greater the angle between the sun and the Earth, the less intense the sun’s rays  this means you get cooler temperatures the further towards the poles you go

14. Latitude and Precipitation
At the equator, the direct sunlight heats moist air, which quickly rises, cools in the upper atmosphere, and falls back to Earth as rain
The land and ocean that are on the equator receive the greatest amount of rainfall on Earth
In polar regions, little moisture can be picked up and carried in cold air, so clouds do no form readily and there is little precipitation
Temperate regions experience the collision of cold air masses from the poles and warm, moist air masses from the tropics that result in seasonal rainfall patterns

15. Elevation
Elevation is the height of a land mass above sea level

16. Elevation and Temperature
Temperature changes occur because the atmosphere becomes thinner at higher elevations, and a thinner atmosphere retains less heat

17. Elevation and Precipitation
On the windward side of a mountain, clouds filled with moisture rise and cool, then release rain or snow
On the leeward side of a mountain, which is the side sheltered from the wind, the air warms again, which allows it to absorb water, creating a dry land area

18. Ocean Currents
Because it takes far more energy to change the temperature of water than land or air, water warms up and cools off much more slowly than either.
As a result, inland climates are subject to more extreme temperature ranges than coastal climates, which are insulated by nearby water.
Over half the heat that reaches the earth from the sun is absorbed by the ocean's surface layer, so surface currents move a lot of heat.
Currents that originate near the equator are warm; currents that flow from the poles are cold.

19. Ocean Currents
Ocean currents carry warm water towards the poles and cold water towards the equator
Since warm air can absorb more moisture, biomes in the path of this warm moving air receive more rain

20. Adaptations to Biomes
Plants and animals have adaptations that allow them to survive in the biomes they live in
Example: Polar bears and beluga whales have blubber to insulate them from the freezing cold in the polar ice biomes
Example: Mosses and lichens cling to trees where they are able to get more sunlight than on the forest floor in the temperate rainforest

21. Adaptations to Biomes
Example: Toucans have have big strong beaks that cut nuts from the trees and crack open the tough shells in the tropical rainforest
Example: Arctic crocus has a fuzzy covering on their stems, leaves, and buds to provide protection from the wind in the tundra

22. Adaptations to Biomes
Example: The fur of snowshoe hares changes from summer brown to winter white, which camouflages them from predators in the boreal forest
Deciduous trees shed their large, broad leaves in winter, which prevents water loss and reduces breakage of limbs from heavy snow in the temperate deciduous forest

23. Adaptations to Biomes
Example: Some trees, such as acacia, have thorns that deter animals from eating them in the tropical grasslands
Example: Large grazing animals are found in grassland because there is plenty of grass. Flat teeth that grind plant materials enable these grazer to make use of all the grass