Tundra is one of the newest and most fragile of all of the biomes on earth. Tundra was first formed only around 10,ooo years ago and it now make up around 20% of the Earth’s surface. Tundra is almost exclusively located in the
Northern Hemisphere, due to the fact that the land in the north is more strategically placed for tundra to form. The soil in a tundra environment is called permafrost. It is frozen for a long portion of the year and is up to 3 feet thick. Due to this the plants in enironments like this must be very durable and resistant to cold. The seasons in this biome are really restricted to winter and summer. Even though there is a very short spring, it is not long enough to be considered a real season. The winters are incrediably cold, as cold as -97 degrees Fehrenheit, and the summers can get as warm as the low 50’s Fehrenheit. There is even a short period of time where the sun shines for 24 hours a day. Even though tundra environments see
m harsh, there are still many animals and plants that live there. In the summers, when the snow and upper layer of permifrost melt, the land becomes marshy. This is the perfect environment for insects and migrating birds to live.
The plant life in the Tundra environment is somewhat limited. There are about 1,700 species of moss, shrubs, and other low lying plant life that live in this area. This low diversity is due to a few key factors. First, the growing season for a plant in this environment is only around 50 days long. Also, the soil is not deep enough to support tree life in most Tundra areas, and this shallow soil also lacks many nutrients. Another problem plant life faces in the region is the high wind velocity that can tear taller plants right out of the ground. These factors make it hard for plants to survive, but they still find a way.
Animal life is also present in Tundra, although like plant life, it has relatively low biodiversity. There are about 50 species in the Tundra region. These range from animals as big as a wolf or bear, and as small as a rodent. The animal population is kept in check by a series of preditors. The grizzley bear and wolf population, which is very low, keeps down the
caribou and moose populations. They act as the keystone predators to the tundra region. A keystone predator is an animal with a low population that has a large impact on the surrounding animals. They serve to keep other populations in check and often control a large territory. Other predators that play an important role in the tundra ecosystem are members of the bird family. Two of these are the Gold and Bald Eagles. These birds of prey help to keep the rodent populations down, which helps take stress of the rodents’ food source. Also, the Arctic foxes will keep down rodent populations while also feeding on dead deer left over from wolves. The owls area of dominance
somewhat overlaps the artic fox. The owl helps keep the rodent population down in the Tundra region, who likewise help keep the insect population down. The Caribou are able to survive on small shrubs and lichen, which makes them essential for keeping the plant population down. Without anyone of these animals, the entire food web would fail. This also means that any human tampering with the area could be disasterous.
The effects of tundra on the environment are also very important to human survival. Tundra is one of the three major Carbon Dioxide sinks in the world. This means
that the plants in the region will take in more CO2 than they give off. For this reason, tundra is essential in the effort to minimize the amounts of Green House Gases in our atmosphere.
Tundra is also one of the most fragile ecosystems that can be found on planet Earth. Since the tempuratures of this region can be extremely cold, the stresses put on the plants and animals of this region are already extreme. This makes any human interference far more damaging than it would be in any other ecosystem. The main threat to the tundra are the oil pipe lines that are now being built in the region, and the towns that are being formed to maintain
these pipe lines. This can cause migration route disturbtion, destruction of habitats, and other serious problems. One huge problem is the use of pesticides to control the insect population. This harms not only the insects, but all of the animals that feed on the insects. But more importantly, the ground in Tundra regions is so sensitive, that a footprint or tire track may remain visible for 50 or 60 years. These tracks can expose roots, and when the roots are hit by the sun, can cause the permafrost to melt. This causes large amounts of erosion. This makes areas around mining facilities extremely susceptible to long term damage, even if the human presence is minimal.
http://www.enviroliteracy.org
http://www.blueplanetbiomes.org/tundra.htm
http://en.wikipedia.org/wiki/Tundra
http://www.windows.ucar.edu/tour/link=/earth/tundra_ecosystem.html