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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Hillsborough River (Florida) ： ウィキペディア英語版 Hillsborough River (Florida) The Hillsborough River is a river located in the state of Florida in the USA. It arises in the Green Swamp near the juncture of Hillsborough, Pasco and Polk counties, and flows 〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed April 18, 2011〕 through Pasco and Hillsborough Counties to an outlet in the city of Tampa on Tampa Bay. The name ''Hillsborough River'' first appeared on a British map in 1769. At the time, the Earl of Hillsborough was the British Secretary of State for the Colonies, and thus controlled the pensions of the surveyors working in the American colonies, which included East Florida. ==History== Geological data suggests that the Hillsborough River has been flowing for about 27,000 years. Humans first made their way to this area 12,000 - 15,000 years ago. In the late 18th century the watershed of the Hillsborough River was a land covered by a rich, old growth forest. Majestic bald cypress, longleaf pine, and sand live oak were hundreds of years old (and in the case of cypress, thousands of years old). In the mid to late 19th century to about 1913 the watershed of this old growth forest began to be logged. As a result of this lumbering activity, most of the trees within the Hillsborough River basin are now less than one hundred years in age. The harvesting of the old growth trees altered the ecosystems they dominated. Trees such as water ash and water locust were able to quickly grow in the sun-lit spaces created when bigger trees were removed. The riverine swamp forest as it exists today has a much different ecology than the ecosystem that had existed along the Hillsborough for the previous ten to fifteen thousand years. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hillsborough River (Florida)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.