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The word ecosystem is short for ecological systems. An ecosystem is a place where living things, such as iguanas and non-living things, such as rocks, live in a shared environment. An ecosystem can be as small as a pond or as large as an ocean. Scientists talk about general ecosystem types: they call them biomes. A biome is a group of ecosystems that have a similar climate and have similar plants and animal species. There are a number of different types of biomes, including fresh water, marine, desert, forest, grassland and tundra. Let's start with fresh water. Fresh water is defined as having a low salt level, usually less than one percent. Places and animals that live in fresh water ecosystems would die if they were placed in water with high levels of salt. There are different types of fresh water areas including ponds, lakes, rivers, streams and wetlands. Marine regions cover about seventy five percent of the earth's surface. Oceans and coral reefs are examples of marine biomes. Marine regions differ from fresh water regions as they have high levels of salt in the water. It's home to millions of species of animals. A desert is an area that receives less than fifty centimetres of rain each year. They are extremely dry places and cover about one fifth of the earth's surface. The Simpson Desert occupies aproximately 176,000 km2 of Central Australia. Forests cover about one third of the earth's land area and are made up of many trees. Trees breathe slightly differently from humans and other animals. Trees breathe in carbon dioxide and exhale oxygen. Humans need oxygen to breathe, that's why it's important that we protect our forests. Grassland ecosystems are land areas that are covered by grasses. Grasslands can be suited into two groups: savannah and temperate. Savannah grasslands are always found in warm, hot or tropical climates. The savannahs of northern Australia including the Kimberley region are typical of this. Temperate grasslands exist in varied climates with cold winters and hot summers. Australia's Kangaroo Island and Cradle Mountain in Tasmania are examples of these biomes. The tundra biome is the coldest of all the biomes, like Churchill in Manitoba, Canada. Tundra ecosystems have very low temperatures, caps of ice and don't have much rain.

Video Details

Duration: 3 minutes and 53 seconds
Country: United Kingdom
Language: English
Views: 250
Posted by: ang_ruiz on Jan 21, 2012

An ecosystem is a biological environment consisting of all the organisms living in a particular area, as well as all the nonliving, physical components of the environment with which the organisms interact, such as air, soil, water and sunlight.

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