Tundra

Tundra Biome

              In the very cold places of the world, survival isn't easy. The soil is frozen, its top surface thawing only during summer, and no trees can grow. Yet plants and animals that are adapted for the harsh conditions thrive. This biome is called tundra. Most of the world's tundra is found in the north polar region. It is called Arctic tundra. There is a small amount of tundra on parts of Antarctica that are not covered with ice. Plus, tundra is found on high altitude mountains and is called alpine tundra.

             Permafrost is the term given to frozen soil. During the winter months, permafrost reaches the surface of the tundra. It is very cold during the winter, with temperatures reaching -60 degrees Fahrenheit (-51 degrees Celsius). Very few animals are active in these harsh conditions.

              In the summer time, the tundra changes. The Sun is out almost 24 hours a day, so the tundra starts to warm up. The permafrost melts at the surface, and plant life grows. However, the permafrost only disappears for a few inches below the surface. There isn't enough soil for trees to grow, so only small plants are found in the tundra.

          At the same time, a variety of animals come out to feast on the plants. Insects come to feed on the animals, and birds appear to enjoy the insects.

Characteristics of tundra include:

1. Extremely cold climate


2. Low biotic diversity


3. Simple vegetation structure


4. Limitation of drainage


5. Short season of growth and reproduction


6. Energy and nutrients in the form of dead organic material


7. Large population oscillations

Tundra is separated into two types:

Arctic tundra

                    Arctic tundra is located in the northern hemisphere, encircling the north pole and extending south to the coniferous forests of the taiga. The arctic is known for its cold, desert-like conditions. The growing season ranges from 50 to 60 days. The average winter temperature is -34° C (-30° F), but the average summer temperature is 3-12° C (37-54° F) which enables this biome to sustain life. Rainfall may vary in different regions of the arctic. Yearly precipitation, including melting snow, is 15 to 25 cm (6 to 10 inches). Soil is formed slowly. A layer of permanently frozen subsoil called permafrost exists, consisting mostly of gravel and finer material. When water saturates the upper surface, bogs and ponds may form, providing moisture for plants. There are no deep root systems in the vegetation of the arctic tundra, however, there are still a wide variety of plants that are able to resist the cold climate. There are about 1,700 kinds of plants in the arctic and subarctic, and these include:

• low shrubs, sedges, reindeer mosses, liverworts, and grasses


• 400 varieties of flowers


• crustose and folios lichen

                   All of the plants are adapted to sweeping winds and disturbances of the soil. Plants are short and group together to resist the cold temperatures and are protected by the snow during the winter. They can carry out photosynthesis at low temperatures and low light intensities. The growing seasons are short and most plants reproduce by budding and division rather than sexually by flowering. The fauna in the arctic is also diverse:

• Herbivorous mammals: lemmings, voles, caribou


• Carnivorous mammals: arctic foxes, wolves, and polar bears


• Migratory birds: ravens, snow buntings, falcons, loons,


• Insects: mosquitoes, flies, moths, grasshoppers


• Fish: cod, flatfish, salmon, and trout

                  Animals are adapted to handle long, cold winters and to breed and raise young quickly in the summer. Animals such as mammals and birds also have additional insulation from fat. Many animals hibernate during the winter because food is not abundant. Another alternative is to migrate south in the winter, like birds do. Reptiles and amphibians are few or absent because of the extremely cold temperatures. Because of constant immigration and emigration, the population continually oscillates.

Alpine tundra
   
                           Alpine tundra is located on mountains throughout the world at high altitude where trees cannot grow. The growing season is approximately 180 days. The nighttime temperature is usually below freezing. Unlike the arctic tundra, the soil in the alpine is well drained. The plants are very similar to those of the arctic ones and include:

• tussock grasses, dwarf trees, small-leafed shrubs, and heaths

Animals living in the alpine tundra are also well adapted:

• Mammals: pikas,, mountain goats, sheep


• Birds: grouse like birds


• Insects: spring tails, grasshoppers ,beetles

world biomes

Wetland biomes

             Wetlands are areas of standing water that support aquatic plants. Marshes, swamps, and bogs are all considered wetlands. Plant species adapted to the very moist and humid conditions are called hydrophytes. These include pond lilies, cattails, sedges, tamarack, and black spruce. Marsh flora also include such species as cypress and gum. Wetlands have the highest species diversity of all ecosystems. Many species of amphibians, reptiles, birds (such as ducks and waders), and fur bearers can be found in the wetlands. Wetlands are not considered freshwater ecosystems as there are some, such as salt marshes, that have high salt concentrations—these support different species of animals, such as shrimp, shellfish, and various grasses.

              The wetland biome is one that many people don’t really see as being important. In fact, in many areas they consider it to be a nuisance. Swampland is the most common type of wetland biome you will find. They also include marshes and bogs and they can be various sizes. Some of them are very long and deep. Others are nothing more than a few feet of water in a given location but they are still very important.

             In a wetland biome the water is always going to be standing still. You will find them in many low lying areas. It is common for them to be very close to lakes, rivers, and streams. They may have water in them all the time or only during particular times of the year. That is a key factor that separates it from other forms of biomes. The combination of both land and water are essential for this biome to form.

              They help the environment to be better due to the fact that they have a natural supply of water. They help to prevent flooding in many locations as they are able to take on excess water from the other sources. However, when a river or lake is low they can also release water back into them. They also have the natural ability to purify surface water.

              Plant matter is released into freshwater biomes from a wetland biome. The importance of this is that it allows for fish to have plenty of types of food for them to survive. Florida has one of the largest wetland biomes in the world. The humid conditions are perfect for such forms of plant and animal life to be able to survive.

Characteristics

             In a wetland biome the conditions are always very moist and humid. What you will find with characteristics can be very specific to a given location. That is because the wetland biome is so frequently going to overlap with or be a part of other biomes out there. Without this particular one though many others wouldn’t be able to thrive as they do.

             The only places on Earth where you won’t find the wetlands biome are around the Artic. The tundra there is too cold and frozen for them to develop. Just about every other biome though is associated with them in some way. In fact, many times the wetland biome is overlooked by people due to where it happens to be located. Experts though know what to look for and have been able to fully identify them.

             Wetland biomes can be made up of freshwater or saltwater. In some regions they are actually a combination of both. The type of water that is found in it will strongly affect the types of life that are able to survive there. The delicate ecosystems in place around these areas are very detailed. When you take the time and effort to examine them closely you will be very surprised by what you find.

Flora and Fauna

             It may surprise you to discover that the wetland biome has more diversity than any other biome out there when it comes to animal life. There are plenty of animals that find this to be the perfect home for them. They have the right climate, access to food, and the shelter they need for survival. Amphibians and reptiles due very well in this type of environment. They include frogs and lizards.

             Birds are also found in this type of environment. Many of them live there all year long. Others will be there for part of the year and then migrate. There are also those that stop to feed along a route to a new location in the wetland biome. With some species of birds it is found that they move from one wetland biome to the next along their migration patterns.

               Alligators and crocodiles are the largest animals found in the wetland biome. In some wetland biomes there is salt content in the water. When that is the case you may find some more diversity in those locations. Those living creatures include shrimp and shellfish.

              Beavers, minks, and rats are the fur bearing creatures you may find around a wetland biome. The size of them and the location will depend on many factors. For the beaver it will be determined by if they have enough for food. They also need various materials to build a dam from for shelter.

              Plant life that grows in the wetland biome are referred to as hydrophytes. They include pond lilies, cattails, tamarack, and blue spruce. Sometimes cypress and gum will be present too but it will depend on the actual location of the habitat. There are numerous types of grasses that grow in a wetland biome. Sometimes shrubs with fruits including the cranberry can be found in these locations.

Major biomes