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Wednesday, December 22, 2010

Natural and modified ecosystems

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The Unit of biosphere comprising physical and biological components interacting among themselves and with their physical environment is called as Ecosystem. Term Ecosystem Biodiversity was first used by A. G. Tensely (1935).

The intricate network of different species present in local ecosystems along with the dynamic interactions between them is called as Ecosystem Biodiversity. Communities of living organisms develop in an ecosystem as per the availability of physical resources in it. Different types of habitats have different types of physical resources. Accordingly, specific types of communities of plants and animals inhabit a particular area, for e.g.: a pond has different types of species of plants and animals. In the same way a desert has communities of plants and animals entirely different from the communities of plants and animals found in the pond. Thus different types of ecosystems have different types of biodiversity. The biodiversity found in different types of ecosystem is also called as Ecological Biodiversity.

Image 1 : Ecosystem Biodiversity in nature

Image 2 : Biodiversity in modified ecosystems

There are a large variety of different ecosystems on this earth and each ecosystem has its own complement of distinctive interlinked species based on differences in the habitat. The ecosystem biodiversity may relate to some specific geographical region, or a political boundary such as a country, a state or a region. When an ecosystem remains undisturbed by human activities, it is called as natural. On the other hand it the ecosystem is changed by human activities, it is called as a modified ecosystem. A farm land or an urban area falls under the category of modified natural ecosystem.

Image 3 : Plant biodiversity in a small area

Key words : ecosystem, biodiversity, modified ecosystem, natural ecosystem

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