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 Habitat fragmentation

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tranthuongbn01

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PostSubject: Habitat fragmentation   Tue Jan 04, 2011 4:54 pm

Habitat fragmentation is frequently caused by humans when native vegetation is cleared for human activities such as agriculture, rural development, urbanization and the creation of hydroelectric reservoirs. Habitats which were once continuous become divided into separate fragments. After intensive clearing, the separate fragments tend to be very small islands isolated from each other by cropland, pasture, pavement, or even barren land. The latter is often the result of slash and burn farming in tropical forests. In the wheatbelt of central western New South Wales, Australia, 90% of the native vegetation has been cleared and over 99% of the tallgrass prairie of North America has been cleared, resulting in extreme habitat fragmentation.

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PostSubject: Re: Habitat fragmentation   Wed Jan 05, 2011 3:48 pm

This southern coastal route past the rough country in the southern Arabian peninsula (Yemen and Oman today) was significant, and the Egyptian Pharaohs built several shallow canals to service the trade, one more or less along the route of today's Suez canal, and another from the Red Sea to the Nile River, both shallow works that were swallowed up by huge sand storms in antiquity. Later the kingdom of Axum arose in Ethiopia to rule a mercantile empire rooted in the trade with Europe via Alexandria.
Ocean trade routes have crossed the Arabian Sea since ancient times, linking the Near East with East Africa, India, Southeast Asia, and China. Historically, sailors in a type of ship called a dhow used the seasonal monsoon winds to cross the water. The sea forms part of the chief shipping route between Europe and India via the Suez Canal, which links the Red Sea with the Mediterranean Sea.

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