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The Arctic Tundra

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Laura Parkinson

on 18 March 2013

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Transcript of The Arctic Tundra

The Arctic Tundra Are among the biggest land mammals on earth.
Males weigh between 700-1400 lbs.
Females weigh between 350-700 lbs. Caribou Feed on plants such as willow leaves.
They use their hooves to dig through the snow to get to the moss and other lichens buried under the arctic surface.
They are known for mass migrations across the tundra in search of food. Arctic Hare Diet consists of buds, berries, twigs, mosses, woody plants, etc.
They are located in northern Canada and various parts of Greenland.
The average length of an arctic hare is 20-26 in.
Their weight is between 8 and 14 lbs. Arctic Fox Eats small animals including voles and lemmings, as well as birds and their eggs.
Will sometimes scavenge on dead carcasses of animals.
Like many foxes, they build a den and can sometimes be in a hillside or river bank and will have multiple entrances and exits. In the arctic tundra, there are... Polar Bears Low shrubs,
reindeer mosses,
400 varieties of flowers,
and, crustose and foliose lichen Temperature in the arctic tundra The arctic tundra is known for its cold, desert-like conditions.
Average winter temperature is -34° C (-30° F)
Average for summer is 3°-12° C (37°-54° F).
It is the summer temperatures that enable the tundra to sustain its life. Precipitation The yearly precipitation (including melting snow) is 15-25 cm (6-10 inches).
Rainfall may vary in different regions of the biome.
Most of the precipitation falls as snow. Soil Quality There is a layer of permanently frozen subsoil in the arctic tundra, called permafrost. It consists mostly of gravel and finer material.
There are not any deep root systems in the vegetation there. Contrast of a food web and a food chain A food chain is a single pathway of feeding relationships among organisms in an ecosystem that result in energy transfer.

Food webs are the interconnected food chains in an ecosystem. Steps of the Nitrogen Cycle The heat from the sun causes the water to turn into water vapor. 2. Condensation The water vapor moves higher in the atmosphere and cools down due to decrease in the temperature. While it is cooling, the water vapor condenses and forms tiny droplets of water. 3. Precipitation The tiny droplets of water keep on accumulating in the clouds, when a cloud can no longer hold any more water droplets, it is released from the cloud in the form of rain, hail, sleet, or snow. 4. Run-Off The water that falls to the surface of earth either stays on the surface, or flows off of it into water bodies such as rivers, lakes, and reservoirs. 5. Percolation The water on the surface of the earth seeps down the ground. 1. Evaporation Biogeochemical Cycle- The process by which materials necessary for organisms are circulated through the environment. Why do ecosystems usually only contain a few trophic levels? Because all organisms that feed on the same kind of food are in the same trophic level. For example, all producers belong to the first trophic level; herbivores belong to the second, and the predators of herbivores belong in the third level. Food Web Laura Parkinson They feed on small rodents, such as lemmings, voles and rabbits.
They build their nests on the ground, typically in a higher place.
They are among the largest owls in the arctic kingdom. Snowy Owl 3. Assimilation- nitrogen compounds in various forms
are taken up from soils by plants which are then used in the formation of plant and animal proteins. 4. Ammonification- the formation of ammonia compounds. 2. Nitrification-
nitrites and nitrates are produced.
5. Dentrification- the final step, nitrogen gas is returned to the atmosphere. 1. Nitrogen Fixation- gaseous nitrogen in the
air is converted into ammonia. And the cycle begins again. Animals in the Arctic Tundra Types of Plants in the Arctic Tundra Food Chain Steps of the Water Cycle And the cycle begins again.
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