Health of estuarine ecosystems

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  • Our current level of long-term and comparative information on estuaries in many cases prohibits objective determination of the status and trends among these ecosystems. The way to resolve this situation is to develop and evaluate estuarine environmental indicators that will permit objective and meaningful evaluation of estuaries. However, this effort far exceeds the ability of one or a few well-intentioned scientists.

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  • Estuaries are areas of high productivity, crucial in the life histories of many fish, invertebrates, and birds, for example, and the sustainability of estuarine biodiversity is vital to the ecological and economic health of coastal regions. On the other hand, estuarine ecosystems are exposed to toxic anthropogenic effluents transported by rivers from remote and nearby conurbations and industrial and agricultural concerns.

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  • Defi ning, gathering, and disseminating international statistics is a collective effort of many people and organizations. The indicators presented in World Development Indicators are the fruit of decades of work at many levels, from the fi eld workers who administer censuses and household surveys to the committees and working parties of the national and international statistical agencies that develop the nomenclature, classifi cations, and standards fundamental to an international statistical system.

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