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   <subfield code="a">Historical and recent changes in Lake Texcoco, a saline lake in Mexico</subfield>
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   <subfield code="a">Historical and recent changes in the nature of Lake Texcoco, a saline lake in Mexico, are described. These changes are particularly important since they significantly affect water supply, drainage and other urban issues in Mexico City, Mexico's largest city and capital located within the general boundaries of the lake basin and gradually sinking (mean annual sinking rate is 30 cm). After brief reviews of the present status of the lake and background geological, palaeolimnological and climatic features, human activities during historical and recent times are considered. Of particular note have been drainage basin activities, diversion of inflows, pollution and over-exploitation of groundwater and biological resources (especially fish and waterfowl). The major effects of these activities are water shortages, soil erosion, salinization, dust storms, sinking ground, poor water quality and decreased biological resources. Conservation measures are discussed.</subfield>
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